From 632e9b71fa62b0534569537755f4ce4de43919fb Mon Sep 17 00:00:00 2001
From: ramonjd <ramonjd@gmail.com>
Date: Mon, 18 Jul 2022 16:09:30 +1000
Subject: [PATCH 01/15] Reinstating the commit in
 edeaca7068196f8960453965fe7fa64632d573ef so we can test fluid configuration

Update docs
---
 .../theme-json-reference/theme-json-living.md |  2 +-
 lib/block-supports/typography.php             | 10 +++----
 schemas/json/theme.json                       | 26 +++++++++++++++++--
 3 files changed, 30 insertions(+), 8 deletions(-)

diff --git a/docs/reference-guides/theme-json-reference/theme-json-living.md b/docs/reference-guides/theme-json-reference/theme-json-living.md
index a694cf63e909f..2abca3afdc39f 100644
--- a/docs/reference-guides/theme-json-reference/theme-json-living.md
+++ b/docs/reference-guides/theme-json-reference/theme-json-living.md
@@ -119,7 +119,7 @@ Settings related to typography.
 | customFontSize | boolean | true |  |
 | fontStyle | boolean | true |  |
 | fontWeight | boolean | true |  |
-| fluid | boolean |  |  |
+| fluid | object |  |  |
 | letterSpacing | boolean | true |  |
 | lineHeight | boolean | false |  |
 | textDecoration | boolean | true |  |
diff --git a/lib/block-supports/typography.php b/lib/block-supports/typography.php
index 01d223b84281e..4ef1f21d1d0f9 100644
--- a/lib/block-supports/typography.php
+++ b/lib/block-supports/typography.php
@@ -451,17 +451,17 @@ function gutenberg_get_typography_font_size_value( $preset, $should_use_fluid_ty
 
 	// Checks if fluid font sizes are activated.
 	$typography_settings         = gutenberg_get_global_settings( array( 'typography' ) );
-	$should_use_fluid_typography = isset( $typography_settings['fluid'] ) && true === $typography_settings['fluid'] ? true : $should_use_fluid_typography;
+	$should_use_fluid_typography = isset( $typography_settings['fluid'] ) && ! empty( $typography_settings['fluid'] ) ? true : $should_use_fluid_typography;
 
 	if ( ! $should_use_fluid_typography ) {
 		return $preset['size'];
 	}
 
 	// Defaults.
-	$default_maximum_viewport_width   = '1600px';
-	$default_minimum_viewport_width   = '768px';
-	$default_minimum_font_size_factor = 0.75;
-	$default_scale_factor             = 1;
+	$default_maximum_viewport_width   = isset( $fluid_settings['maxViewPortWidth'] ) ? $fluid_settings['maxViewPortWidth'] : '1600px';
+	$default_minimum_viewport_width   = isset( $fluid_settings['minViewPortWidth'] ) ? $fluid_settings['minViewPortWidth'] : '768px';
+	$default_minimum_font_size_factor = isset( $fluid_settings['minFontSizeFactor'] ) && is_numeric( $fluid_settings['minFontSizeFactor'] ) ? $fluid_settings['minFontSizeFactor'] : 0.75;
+	$default_scale_factor             = isset( $fluid_settings['scaleFactor'] ) && is_numeric( $fluid_settings['scaleFactor'] ) ? $fluid_settings['scaleFactor'] : 1;
 	$default_minimum_font_size_limit  = '14px';
 
 	// Font sizes.
diff --git a/schemas/json/theme.json b/schemas/json/theme.json
index 1a8aa67b0967b..177cb1713b371 100644
--- a/schemas/json/theme.json
+++ b/schemas/json/theme.json
@@ -353,8 +353,30 @@
 							"default": true
 						},
 						"fluid": {
-							"description": "Opts into fluid typography.",
-							"type": "boolean"
+							"description": "Enables fluid typography and allows users to set global fluid typography parameters.",
+							"type": "object",
+							"properties": {
+								"maxViewPortWidth": {
+									"description": "Allow users to set custom a max viewport width in px, rem or em, used to set the maximum size boundary of a fluid font.",
+									"type": "string"
+								},
+								"minViewPortWidth": {
+									"description": "Allow users to set custom a min viewport width in px, rem or em, used to set the minimum size boundary of a fluid font",
+									"type": "string"
+								},
+								"minFontSizeFactor": {
+									"description": "Used to calculate a minimum font size from a single size value, where `fluidSize.min` is not set.",
+									"type": "number"
+								},
+								"maxFontSizeFactor": {
+									"description": "Used to calculate a maximum font size from a single size value, where `fluidSize.max` is not set.",
+									"type": "number"
+								},
+								"scaleFactor": {
+									"description": "Determines the rate of font size change between the minimum and maximum font sizes. The higher the value the faster the change.",
+									"type": "number"
+								}
+							}
 						},
 						"letterSpacing": {
 							"description": "Allow users to set custom letter spacing.",

From 6d14b115924f0ef7382353b7533283aa80ea014e Mon Sep 17 00:00:00 2001
From: ramonjd <ramonjd@gmail.com>
Date: Tue, 19 Jul 2022 09:40:24 +1000
Subject: [PATCH 02/15] Adding a filter pre-calculations

---
 lib/block-supports/typography.php          | 24 +++++++++++++--
 phpunit/block-supports/typography-test.php | 36 ++++++++++++++++++++++
 2 files changed, 58 insertions(+), 2 deletions(-)

diff --git a/lib/block-supports/typography.php b/lib/block-supports/typography.php
index 4ef1f21d1d0f9..a8686e5b8cddf 100644
--- a/lib/block-supports/typography.php
+++ b/lib/block-supports/typography.php
@@ -359,7 +359,27 @@ function gutenberg_get_typography_value_and_unit( $raw_value, $options = array()
  * }
  * @return string|null A font-size value using clamp().
  */
-function gutenberg_get_computed_fluid_typography_value( $args = array() ) {
+function gutenberg_get_computed_fluid_font_size_value( $args = array() ) {
+	/**
+	 * Filters the fluid font size arguments array before the internal calculations take place.
+	 *
+	 * Return a non-null value to bypass the WordPress internal calculations.
+	 *
+	 * @param string|null $fluid_typography_value Return a font-size value using the passed arguments to short-circuit the default calculations,
+	 *                                            or null to allow WordPress to calculate the font size value.
+	 * @param array $args array(
+	 *     'maximum_viewport_width' => (string) Maximum size up to which type will have fluidity.
+	 *     'minimum_viewport_width' => (string) Minimum viewport size from which type will have fluidity.
+	 *     'maximum_font_size'      => (string) Maximum font size.
+	 *     'minimum_font_size'      => (string) Minimum font size.
+	 *     'scale_factor'           => (number) A scale factor to determine how fast a font scales within boundaries.
+	 * );.
+	 */
+	$fluid_typography_value = apply_filters( 'pre_get_computed_fluid_font_size_value', null, $args );
+	if ( ! is_null( $fluid_typography_value ) ) {
+		return $fluid_typography_value;
+	}
+
 	$maximum_viewport_width_raw = isset( $args['maximum_viewport_width'] ) ? $args['maximum_viewport_width'] : null;
 	$minimum_viewport_width_raw = isset( $args['minimum_viewport_width'] ) ? $args['minimum_viewport_width'] : null;
 	$maximum_font_size_raw      = isset( $args['maximum_font_size'] ) ? $args['maximum_font_size'] : null;
@@ -524,7 +544,7 @@ function gutenberg_get_typography_font_size_value( $preset, $should_use_fluid_ty
 		}
 	}
 
-	$fluid_font_size_value = gutenberg_get_computed_fluid_typography_value(
+	$fluid_font_size_value = gutenberg_get_computed_fluid_font_size_value(
 		array(
 			'minimum_viewport_width' => $default_minimum_viewport_width,
 			'maximum_viewport_width' => $default_maximum_viewport_width,
diff --git a/phpunit/block-supports/typography-test.php b/phpunit/block-supports/typography-test.php
index 63fd98d1e524f..c3d1c835217fd 100644
--- a/phpunit/block-supports/typography-test.php
+++ b/phpunit/block-supports/typography-test.php
@@ -825,4 +825,40 @@ public function data_invalid_size_wp_get_typography_value_and_unit() {
 			'size: array' => array( array( '10' ) ),
 		);
 	}
+
+	/**
+	 * Tests bypassing WordPress font size calculations using the `pre_get_computed_fluid_typography_value` filter.
+	 */
+	public function test_gutenberg_get_computed_fluid_typography_value_filter() {
+		add_filter( 'pre_get_computed_fluid_font_size_value', array( $this, 'filter_fluid_font_size' ), 10, 2 );
+		$filtered_fluid_font_size_value = gutenberg_get_computed_fluid_font_size_value(
+			array(
+				'minimum_viewport_width' => '100px',
+				'maximum_viewport_width' => '200px',
+				'minimum_font_size'      => '1em',
+				'maximum_font_size'      => '2em',
+				'scale_factor'           => '.9',
+			)
+		);
+		remove_filter( 'pre_get_computed_fluid_font_size_value', array( $this, 'filter_fluid_font_size' ) );
+		$this->assertSame( 'clamp(1em, 0.818rem + .9vw, 2em)', $filtered_fluid_font_size_value );
+	}
+
+	/**
+	 * Filters the fluid font size arguments array before the internal calculations take place.
+	 *
+	 * @param string|null $fluid_typography_value Return a font-size value using the passed arguments to short-circuit the default calculations,
+	 *                                            or null to allow WordPress to calculate the font size value.
+	 * @param array       $args array(
+	 *           'maximum_viewport_width' => (string) Maximum size up to which type will have fluidity.
+	 *           'minimum_viewport_width' => (string) Minimum viewport size from which type will have fluidity.
+	 *           'maximum_font_size'      => (string) Maximum font size.
+	 *           'minimum_font_size'      => (string) Minimum font size.
+	 *           'scale_factor'           => (number) A scale factor to determine how fast a font scales within boundaries.
+	 *       );.
+	 * @return string A font-size value
+	 */
+	public function filter_fluid_font_size( $fluid_typography_value, $args ) {
+		return "clamp({$args['minimum_font_size']}, 0.818rem + {$args['scale_factor']}vw, {$args['maximum_font_size']})";
+	}
 }

From fdf74f1246640b05f978155b656b79b0db58917d Mon Sep 17 00:00:00 2001
From: ramonjd <ramonjd@gmail.com>
Date: Thu, 27 Oct 2022 15:23:17 +1100
Subject: [PATCH 03/15] $fluid_settings was missing

---
 lib/block-supports/typography.php | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/block-supports/typography.php b/lib/block-supports/typography.php
index a8686e5b8cddf..dffb46939e8f6 100644
--- a/lib/block-supports/typography.php
+++ b/lib/block-supports/typography.php
@@ -477,6 +477,8 @@ function gutenberg_get_typography_font_size_value( $preset, $should_use_fluid_ty
 		return $preset['size'];
 	}
 
+	$fluid_settings = is_array( $typography_settings['fluid'] ) ? $typography_settings['fluid'] : array();
+
 	// Defaults.
 	$default_maximum_viewport_width   = isset( $fluid_settings['maxViewPortWidth'] ) ? $fluid_settings['maxViewPortWidth'] : '1600px';
 	$default_minimum_viewport_width   = isset( $fluid_settings['minViewPortWidth'] ) ? $fluid_settings['minViewPortWidth'] : '768px';

From 5f2a77a1240515bbabdd963cd7daa45a84f2574d Mon Sep 17 00:00:00 2001
From: ramonjd <ramonjd@gmail.com>
Date: Thu, 27 Oct 2022 16:33:45 +1100
Subject: [PATCH 04/15] Removing filter Pulling across config changes to JS

---
 .../theme-json-reference/theme-json-living.md |   2 +-
 lib/block-supports/typography.php             |  20 ----
 packages/block-editor/src/hooks/font-size.js  |  24 +++-
 .../global-styles/typography-utils.js         |  32 +++++-
 phpunit/block-supports/typography-test.php    |  36 ------
 schemas/json/theme.json                       | 103 ++++++++++++------
 6 files changed, 118 insertions(+), 99 deletions(-)

diff --git a/docs/reference-guides/theme-json-reference/theme-json-living.md b/docs/reference-guides/theme-json-reference/theme-json-living.md
index 2abca3afdc39f..9b074edace6ae 100644
--- a/docs/reference-guides/theme-json-reference/theme-json-living.md
+++ b/docs/reference-guides/theme-json-reference/theme-json-living.md
@@ -119,7 +119,7 @@ Settings related to typography.
 | customFontSize | boolean | true |  |
 | fontStyle | boolean | true |  |
 | fontWeight | boolean | true |  |
-| fluid | object |  |  |
+| fluid | undefined | false |  |
 | letterSpacing | boolean | true |  |
 | lineHeight | boolean | false |  |
 | textDecoration | boolean | true |  |
diff --git a/lib/block-supports/typography.php b/lib/block-supports/typography.php
index dffb46939e8f6..ac9412c65a3fe 100644
--- a/lib/block-supports/typography.php
+++ b/lib/block-supports/typography.php
@@ -360,26 +360,6 @@ function gutenberg_get_typography_value_and_unit( $raw_value, $options = array()
  * @return string|null A font-size value using clamp().
  */
 function gutenberg_get_computed_fluid_font_size_value( $args = array() ) {
-	/**
-	 * Filters the fluid font size arguments array before the internal calculations take place.
-	 *
-	 * Return a non-null value to bypass the WordPress internal calculations.
-	 *
-	 * @param string|null $fluid_typography_value Return a font-size value using the passed arguments to short-circuit the default calculations,
-	 *                                            or null to allow WordPress to calculate the font size value.
-	 * @param array $args array(
-	 *     'maximum_viewport_width' => (string) Maximum size up to which type will have fluidity.
-	 *     'minimum_viewport_width' => (string) Minimum viewport size from which type will have fluidity.
-	 *     'maximum_font_size'      => (string) Maximum font size.
-	 *     'minimum_font_size'      => (string) Minimum font size.
-	 *     'scale_factor'           => (number) A scale factor to determine how fast a font scales within boundaries.
-	 * );.
-	 */
-	$fluid_typography_value = apply_filters( 'pre_get_computed_fluid_font_size_value', null, $args );
-	if ( ! is_null( $fluid_typography_value ) ) {
-		return $fluid_typography_value;
-	}
-
 	$maximum_viewport_width_raw = isset( $args['maximum_viewport_width'] ) ? $args['maximum_viewport_width'] : null;
 	$minimum_viewport_width_raw = isset( $args['minimum_viewport_width'] ) ? $args['minimum_viewport_width'] : null;
 	$maximum_font_size_raw      = isset( $args['maximum_font_size'] ) ? $args['maximum_font_size'] : null;
diff --git a/packages/block-editor/src/hooks/font-size.js b/packages/block-editor/src/hooks/font-size.js
index 6cb950afc4564..fcfefdb789267 100644
--- a/packages/block-editor/src/hooks/font-size.js
+++ b/packages/block-editor/src/hooks/font-size.js
@@ -324,13 +324,29 @@ function addEditPropsForFluidCustomFontSizes( blockType ) {
 		// BlockListContext.Provider. If we set fontSize using editor.
 		// BlockListBlock instead of using getEditWrapperProps then the value is
 		// clobbered when the core/style/addEditProps filter runs.
-		const isFluidTypographyEnabled =
-			!! select( blockEditorStore ).getSettings().__experimentalFeatures
+		const fluidTypographyConfig =
+			select( blockEditorStore ).getSettings().__experimentalFeatures
 				?.typography?.fluid;
 
+		const fluidTypographySettings =
+			typeof fluidTypographyConfig?.fluid === 'object'
+				? fluidTypographyConfig?.fluid
+				: {};
+
 		const newFontSize =
-			fontSize && isFluidTypographyEnabled
-				? getComputedFluidTypographyValue( { fontSize } )
+			fontSize && !! fluidTypographyConfig
+				? getComputedFluidTypographyValue( {
+						fontSize,
+						minimumViewPortWidth:
+							fluidTypographySettings?.minViewPortWidth,
+						maximumViewPortWidth:
+							fluidTypographySettings?.maxViewPortWidth,
+						scaleFactor: fluidTypographySettings?.scaleFactor,
+						minimumFontSizeFactor:
+							fluidTypographySettings?.minViewPortWidth,
+						maximumFontSizeFactor:
+							fluidTypographySettings?.maxFontSizeFactor,
+				  } )
 				: null;
 
 		if ( newFontSize === null ) {
diff --git a/packages/edit-site/src/components/global-styles/typography-utils.js b/packages/edit-site/src/components/global-styles/typography-utils.js
index a792d1875005c..3498d9057b273 100644
--- a/packages/edit-site/src/components/global-styles/typography-utils.js
+++ b/packages/edit-site/src/components/global-styles/typography-utils.js
@@ -23,13 +23,23 @@ import { getComputedFluidTypographyValue } from '@wordpress/block-editor';
  * @property {boolean|FluidPreset|undefined} fluid A font size slug
  */
 
+/**
+ * @typedef {Object} TypographySettings
+ * @property {?string|?number} size              A default font size.
+ * @property {?string}         minViewPortWidth  Minimum viewport size from which type will have fluidity. Optional if size is specified.
+ * @property {?string}         maxViewPortWidth  Maximum size up to which type will have fluidity. Optional if size is specified.
+ * @property {?number}         scaleFactor       A scale factor to determine how fast a font scales within boundaries. Optional.
+ * @property {?number}         minFontSizeFactor How much to scale defaultFontSize by to derive minimumFontSize. Optional.
+ * @property {?number}         maxFontSizeFactor How much to scale defaultFontSize by to derive maximumFontSize. Optional.
+ */
+
 /**
  * Returns a font-size value based on a given font-size preset.
  * Takes into account fluid typography parameters and attempts to return a css formula depending on available, valid values.
  *
- * @param {Preset}  preset
- * @param {Object}  typographySettings
- * @param {boolean} typographySettings.fluid Whether fluid typography is enabled.
+ * @param {Preset}                     preset
+ * @param {Object}                     typographySettings
+ * @param {boolean|TypographySettings} typographySettings.fluid Whether fluid typography is enabled, and, optionally, fluid font size options.
  *
  * @return {string|*} A font-size value or the value of preset.size.
  */
@@ -44,7 +54,11 @@ export function getTypographyFontSizeValue( preset, typographySettings ) {
 		return defaultSize;
 	}
 
-	if ( true !== typographySettings?.fluid ) {
+	if (
+		false === typographySettings?.fluid ||
+		( !! typographySettings?.fluid &&
+			Object.keys( typographySettings.fluid ).length === 0 )
+	) {
 		return defaultSize;
 	}
 
@@ -53,10 +67,20 @@ export function getTypographyFontSizeValue( preset, typographySettings ) {
 		return defaultSize;
 	}
 
+	const fluidTypographySettings =
+		typeof typographySettings?.fluid === 'object'
+			? typographySettings?.fluid
+			: {};
+
 	const fluidFontSizeValue = getComputedFluidTypographyValue( {
 		minimumFontSize: preset?.fluid?.min,
 		maximumFontSize: preset?.fluid?.max,
 		fontSize: defaultSize,
+		minimumViewPortWidth: fluidTypographySettings?.minViewPortWidth,
+		maximumViewPortWidth: fluidTypographySettings?.maxViewPortWidth,
+		scaleFactor: fluidTypographySettings?.scaleFactor,
+		minimumFontSizeFactor: fluidTypographySettings?.minViewPortWidth,
+		maximumFontSizeFactor: fluidTypographySettings?.maxFontSizeFactor,
 	} );
 
 	if ( !! fluidFontSizeValue ) {
diff --git a/phpunit/block-supports/typography-test.php b/phpunit/block-supports/typography-test.php
index c3d1c835217fd..63fd98d1e524f 100644
--- a/phpunit/block-supports/typography-test.php
+++ b/phpunit/block-supports/typography-test.php
@@ -825,40 +825,4 @@ public function data_invalid_size_wp_get_typography_value_and_unit() {
 			'size: array' => array( array( '10' ) ),
 		);
 	}
-
-	/**
-	 * Tests bypassing WordPress font size calculations using the `pre_get_computed_fluid_typography_value` filter.
-	 */
-	public function test_gutenberg_get_computed_fluid_typography_value_filter() {
-		add_filter( 'pre_get_computed_fluid_font_size_value', array( $this, 'filter_fluid_font_size' ), 10, 2 );
-		$filtered_fluid_font_size_value = gutenberg_get_computed_fluid_font_size_value(
-			array(
-				'minimum_viewport_width' => '100px',
-				'maximum_viewport_width' => '200px',
-				'minimum_font_size'      => '1em',
-				'maximum_font_size'      => '2em',
-				'scale_factor'           => '.9',
-			)
-		);
-		remove_filter( 'pre_get_computed_fluid_font_size_value', array( $this, 'filter_fluid_font_size' ) );
-		$this->assertSame( 'clamp(1em, 0.818rem + .9vw, 2em)', $filtered_fluid_font_size_value );
-	}
-
-	/**
-	 * Filters the fluid font size arguments array before the internal calculations take place.
-	 *
-	 * @param string|null $fluid_typography_value Return a font-size value using the passed arguments to short-circuit the default calculations,
-	 *                                            or null to allow WordPress to calculate the font size value.
-	 * @param array       $args array(
-	 *           'maximum_viewport_width' => (string) Maximum size up to which type will have fluidity.
-	 *           'minimum_viewport_width' => (string) Minimum viewport size from which type will have fluidity.
-	 *           'maximum_font_size'      => (string) Maximum font size.
-	 *           'minimum_font_size'      => (string) Minimum font size.
-	 *           'scale_factor'           => (number) A scale factor to determine how fast a font scales within boundaries.
-	 *       );.
-	 * @return string A font-size value
-	 */
-	public function filter_fluid_font_size( $fluid_typography_value, $args ) {
-		return "clamp({$args['minimum_font_size']}, 0.818rem + {$args['scale_factor']}vw, {$args['maximum_font_size']})";
-	}
 }
diff --git a/schemas/json/theme.json b/schemas/json/theme.json
index 177cb1713b371..d8767d5700781 100644
--- a/schemas/json/theme.json
+++ b/schemas/json/theme.json
@@ -234,8 +234,12 @@
 						"blockGap": {
 							"description": "Enables `--wp--style--block-gap` to be generated from styles.spacing.blockGap.\nA value of `null` instead of `false` further disables layout styles from being generated.",
 							"oneOf": [
-								{ "type": "boolean" },
-								{ "type": "null" }
+								{
+									"type": "boolean"
+								},
+								{
+									"type": "null"
+								}
 							],
 							"default": null
 						},
@@ -354,29 +358,38 @@
 						},
 						"fluid": {
 							"description": "Enables fluid typography and allows users to set global fluid typography parameters.",
-							"type": "object",
-							"properties": {
-								"maxViewPortWidth": {
-									"description": "Allow users to set custom a max viewport width in px, rem or em, used to set the maximum size boundary of a fluid font.",
-									"type": "string"
-								},
-								"minViewPortWidth": {
-									"description": "Allow users to set custom a min viewport width in px, rem or em, used to set the minimum size boundary of a fluid font",
-									"type": "string"
-								},
-								"minFontSizeFactor": {
-									"description": "Used to calculate a minimum font size from a single size value, where `fluidSize.min` is not set.",
-									"type": "number"
-								},
-								"maxFontSizeFactor": {
-									"description": "Used to calculate a maximum font size from a single size value, where `fluidSize.max` is not set.",
-									"type": "number"
+							"oneOf": [
+								{
+									"type": "object",
+									"properties": {
+										"maxViewPortWidth": {
+											"description": "Allow users to set custom a max viewport width in px, rem or em, used to set the maximum size boundary of a fluid font.",
+											"type": "string"
+										},
+										"minViewPortWidth": {
+											"description": "Allow users to set custom a min viewport width in px, rem or em, used to set the minimum size boundary of a fluid font",
+											"type": "string"
+										},
+										"minFontSizeFactor": {
+											"description": "Used to calculate a minimum font size from a single size value, where `fluidSize.min` is not set.",
+											"type": "number"
+										},
+										"maxFontSizeFactor": {
+											"description": "Used to calculate a maximum font size from a single size value, where `fluidSize.max` is not set.",
+											"type": "number"
+										},
+										"scaleFactor": {
+											"description": "Determines the rate of font size change between the minimum and maximum font sizes. The higher the value the faster the change.",
+											"type": "number"
+										}
+									},
+									"additionalProperties": false
 								},
-								"scaleFactor": {
-									"description": "Determines the rate of font size change between the minimum and maximum font sizes. The higher the value the faster the change.",
-									"type": "number"
+								{
+									"type": "boolean"
 								}
-							}
+							],
+							"default": false
 						},
 						"letterSpacing": {
 							"description": "Allow users to set custom letter spacing.",
@@ -581,13 +594,27 @@
 		},
 		"settingsProperties": {
 			"allOf": [
-				{ "$ref": "#/definitions/settingsPropertiesAppearanceTools" },
-				{ "$ref": "#/definitions/settingsPropertiesBorder" },
-				{ "$ref": "#/definitions/settingsPropertiesColor" },
-				{ "$ref": "#/definitions/settingsPropertiesLayout" },
-				{ "$ref": "#/definitions/settingsPropertiesSpacing" },
-				{ "$ref": "#/definitions/settingsPropertiesTypography" },
-				{ "$ref": "#/definitions/settingsPropertiesCustom" }
+				{
+					"$ref": "#/definitions/settingsPropertiesAppearanceTools"
+				},
+				{
+					"$ref": "#/definitions/settingsPropertiesBorder"
+				},
+				{
+					"$ref": "#/definitions/settingsPropertiesColor"
+				},
+				{
+					"$ref": "#/definitions/settingsPropertiesLayout"
+				},
+				{
+					"$ref": "#/definitions/settingsPropertiesSpacing"
+				},
+				{
+					"$ref": "#/definitions/settingsPropertiesTypography"
+				},
+				{
+					"$ref": "#/definitions/settingsPropertiesCustom"
+				}
 			]
 		},
 		"settingsPropertiesComplete": {
@@ -649,13 +676,21 @@
 								}
 							}
 						},
-						{ "$ref": "#/definitions/settingsPropertiesColor" },
-						{ "$ref": "#/definitions/settingsPropertiesLayout" },
-						{ "$ref": "#/definitions/settingsPropertiesSpacing" },
+						{
+							"$ref": "#/definitions/settingsPropertiesColor"
+						},
+						{
+							"$ref": "#/definitions/settingsPropertiesLayout"
+						},
+						{
+							"$ref": "#/definitions/settingsPropertiesSpacing"
+						},
 						{
 							"$ref": "#/definitions/settingsPropertiesTypography"
 						},
-						{ "$ref": "#/definitions/settingsPropertiesCustom" }
+						{
+							"$ref": "#/definitions/settingsPropertiesCustom"
+						}
 					]
 				},
 				"core/buttons": {

From a6533d541eab63e796bff82d627bef9d3a9cca75 Mon Sep 17 00:00:00 2001
From: ramonjd <ramonjd@gmail.com>
Date: Tue, 1 Nov 2022 15:41:48 +1100
Subject: [PATCH 05/15] Add config slot for minFontSize

---
 lib/block-supports/typography.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/block-supports/typography.php b/lib/block-supports/typography.php
index ac9412c65a3fe..56f2f47e30147 100644
--- a/lib/block-supports/typography.php
+++ b/lib/block-supports/typography.php
@@ -464,7 +464,7 @@ function gutenberg_get_typography_font_size_value( $preset, $should_use_fluid_ty
 	$default_minimum_viewport_width   = isset( $fluid_settings['minViewPortWidth'] ) ? $fluid_settings['minViewPortWidth'] : '768px';
 	$default_minimum_font_size_factor = isset( $fluid_settings['minFontSizeFactor'] ) && is_numeric( $fluid_settings['minFontSizeFactor'] ) ? $fluid_settings['minFontSizeFactor'] : 0.75;
 	$default_scale_factor             = isset( $fluid_settings['scaleFactor'] ) && is_numeric( $fluid_settings['scaleFactor'] ) ? $fluid_settings['scaleFactor'] : 1;
-	$default_minimum_font_size_limit  = '14px';
+	$global_minimum_font_size         = isset( $fluid_settings['minFontSize'] ) && is_numeric( $fluid_settings['minFontSize'] ) ? $fluid_settings['minFontSize'] : '14px';
 
 	// Font sizes.
 	$fluid_font_size_settings = isset( $preset['fluid'] ) ? $preset['fluid'] : null;
@@ -488,7 +488,7 @@ function gutenberg_get_typography_font_size_value( $preset, $should_use_fluid_ty
 
 	// Parses the minimum font size limit, so we can perform checks using it.
 	$minimum_font_size_limit = gutenberg_get_typography_value_and_unit(
-		$default_minimum_font_size_limit,
+		$global_minimum_font_size,
 		array(
 			'coerce_to' => $preferred_size['unit'],
 		)

From dcf083e38f9b7ee4155613713f705ad082f4e002 Mon Sep 17 00:00:00 2001
From: ramonjd <ramonjd@gmail.com>
Date: Tue, 1 Nov 2022 16:46:57 +1100
Subject: [PATCH 06/15] Adding config to test theme

---
 .../block-theme-child-with-fluid-typography/theme.json   | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/phpunit/data/themedir1/block-theme-child-with-fluid-typography/theme.json b/phpunit/data/themedir1/block-theme-child-with-fluid-typography/theme.json
index 93234766eddd2..1ddb6db02a1b2 100644
--- a/phpunit/data/themedir1/block-theme-child-with-fluid-typography/theme.json
+++ b/phpunit/data/themedir1/block-theme-child-with-fluid-typography/theme.json
@@ -3,7 +3,14 @@
 	"settings": {
 		"appearanceTools": true,
 		"typography": {
-			"fluid": true
+			"fluid": {
+				"maxViewPortWidth": "2000px",
+				"minViewPortWidth": "1000px",
+				"minFontSizeFactor": 1.5,
+				"maxFontSizeFactor": 2,
+				"scaleFactor": 2,
+				"minFontSize": "16px"
+			}
 		}
 	}
 }

From d0f1697ab2371f119e18b143d8ecaa13eb6227c5 Mon Sep 17 00:00:00 2001
From: ramonjd <ramonjd@gmail.com>
Date: Wed, 16 Nov 2022 09:47:55 +1100
Subject: [PATCH 07/15] Updating args to include `minimumFontSizeLimit` Fixed
 `typographySettings` check

---
 packages/block-editor/README.md                           | 1 +
 .../block-editor/src/components/font-sizes/fluid-utils.js | 1 +
 .../src/components/global-styles/typography-utils.js      | 8 ++++----
 3 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/packages/block-editor/README.md b/packages/block-editor/README.md
index 5760f1584c5db..a90eadbaf7e43 100644
--- a/packages/block-editor/README.md
+++ b/packages/block-editor/README.md
@@ -428,6 +428,7 @@ _Parameters_
 -   _args.minimumFontSize_ `?string`: Minimum font size for any clamp() calculation. Optional.
 -   _args.scaleFactor_ `?number`: A scale factor to determine how fast a font scales within boundaries. Optional.
 -   _args.minimumFontSizeFactor_ `?number`: How much to scale defaultFontSize by to derive minimumFontSize. Optional.
+-   _args.minimumFontSizeLimit_ `?string`: The smallest a calculated font size may be. Optional.
 
 _Returns_
 
diff --git a/packages/block-editor/src/components/font-sizes/fluid-utils.js b/packages/block-editor/src/components/font-sizes/fluid-utils.js
index de8a27e3014e8..3cc6d434901c6 100644
--- a/packages/block-editor/src/components/font-sizes/fluid-utils.js
+++ b/packages/block-editor/src/components/font-sizes/fluid-utils.js
@@ -40,6 +40,7 @@ const DEFAULT_MINIMUM_FONT_SIZE_LIMIT = '14px';
  * @param {?string}       args.minimumFontSize       Minimum font size for any clamp() calculation. Optional.
  * @param {?number}       args.scaleFactor           A scale factor to determine how fast a font scales within boundaries. Optional.
  * @param {?number}       args.minimumFontSizeFactor How much to scale defaultFontSize by to derive minimumFontSize. Optional.
+ * @param {?string}       args.minimumFontSizeLimit  The smallest a calculated font size may be. Optional.
  *
  * @return {string|null} A font-size value using clamp().
  */
diff --git a/packages/edit-site/src/components/global-styles/typography-utils.js b/packages/edit-site/src/components/global-styles/typography-utils.js
index 3498d9057b273..57622a88f3299 100644
--- a/packages/edit-site/src/components/global-styles/typography-utils.js
+++ b/packages/edit-site/src/components/global-styles/typography-utils.js
@@ -30,7 +30,7 @@ import { getComputedFluidTypographyValue } from '@wordpress/block-editor';
  * @property {?string}         maxViewPortWidth  Maximum size up to which type will have fluidity. Optional if size is specified.
  * @property {?number}         scaleFactor       A scale factor to determine how fast a font scales within boundaries. Optional.
  * @property {?number}         minFontSizeFactor How much to scale defaultFontSize by to derive minimumFontSize. Optional.
- * @property {?number}         maxFontSizeFactor How much to scale defaultFontSize by to derive maximumFontSize. Optional.
+ * @property {?string}         minFontSize       The smallest a calculated font size may be. Optional.
  */
 
 /**
@@ -55,8 +55,8 @@ export function getTypographyFontSizeValue( preset, typographySettings ) {
 	}
 
 	if (
-		false === typographySettings?.fluid ||
-		( !! typographySettings?.fluid &&
+		true !== typographySettings?.fluid ||
+		( typeof typographySettings?.fluid === 'object' &&
 			Object.keys( typographySettings.fluid ).length === 0 )
 	) {
 		return defaultSize;
@@ -80,7 +80,7 @@ export function getTypographyFontSizeValue( preset, typographySettings ) {
 		maximumViewPortWidth: fluidTypographySettings?.maxViewPortWidth,
 		scaleFactor: fluidTypographySettings?.scaleFactor,
 		minimumFontSizeFactor: fluidTypographySettings?.minViewPortWidth,
-		maximumFontSizeFactor: fluidTypographySettings?.maxFontSizeFactor,
+		minimumFontSizeLimit: fluidTypographySettings?.minFontSize,
 	} );
 
 	if ( !! fluidFontSizeValue ) {

From 3b6cd9a687beccdc44571106689773df785ffc7e Mon Sep 17 00:00:00 2001
From: ramonjd <ramonjd@gmail.com>
Date: Wed, 16 Nov 2022 10:51:29 +1100
Subject: [PATCH 08/15] Updating tests and fixing settings logic Updating
 schema

Changelogs
---
 lib/block-supports/typography.php             | 11 ++-
 packages/block-editor/CHANGELOG.md            |  1 +
 packages/edit-site/CHANGELOG.md               |  6 +-
 .../global-styles/test/typography-utils.js    | 88 ++++++++++++++-----
 .../global-styles/typography-utils.js         |  4 +-
 phpunit/block-supports/typography-test.php    | 17 ++--
 .../theme.json                                |  3 +-
 schemas/json/theme.json                       | 10 +--
 8 files changed, 97 insertions(+), 43 deletions(-)

diff --git a/lib/block-supports/typography.php b/lib/block-supports/typography.php
index 56f2f47e30147..758cf4e5cbc65 100644
--- a/lib/block-supports/typography.php
+++ b/lib/block-supports/typography.php
@@ -451,20 +451,24 @@ function gutenberg_get_typography_font_size_value( $preset, $should_use_fluid_ty
 
 	// Checks if fluid font sizes are activated.
 	$typography_settings         = gutenberg_get_global_settings( array( 'typography' ) );
-	$should_use_fluid_typography = isset( $typography_settings['fluid'] ) && ! empty( $typography_settings['fluid'] ) ? true : $should_use_fluid_typography;
+	$should_use_fluid_typography
+		= isset( $typography_settings['fluid'] ) &&
+		( true === $typography_settings['fluid'] || is_array( $typography_settings['fluid'] ) ) ?
+		true :
+		$should_use_fluid_typography;
 
 	if ( ! $should_use_fluid_typography ) {
 		return $preset['size'];
 	}
 
-	$fluid_settings = is_array( $typography_settings['fluid'] ) ? $typography_settings['fluid'] : array();
+	$fluid_settings = isset( $typography_settings['fluid'] ) && is_array( $typography_settings['fluid'] ) ? $typography_settings['fluid'] : array();
 
 	// Defaults.
 	$default_maximum_viewport_width   = isset( $fluid_settings['maxViewPortWidth'] ) ? $fluid_settings['maxViewPortWidth'] : '1600px';
 	$default_minimum_viewport_width   = isset( $fluid_settings['minViewPortWidth'] ) ? $fluid_settings['minViewPortWidth'] : '768px';
 	$default_minimum_font_size_factor = isset( $fluid_settings['minFontSizeFactor'] ) && is_numeric( $fluid_settings['minFontSizeFactor'] ) ? $fluid_settings['minFontSizeFactor'] : 0.75;
 	$default_scale_factor             = isset( $fluid_settings['scaleFactor'] ) && is_numeric( $fluid_settings['scaleFactor'] ) ? $fluid_settings['scaleFactor'] : 1;
-	$global_minimum_font_size         = isset( $fluid_settings['minFontSize'] ) && is_numeric( $fluid_settings['minFontSize'] ) ? $fluid_settings['minFontSize'] : '14px';
+	$global_minimum_font_size         = isset( $fluid_settings['minFontSize'] ) ? $fluid_settings['minFontSize'] : '14px';
 
 	// Font sizes.
 	$fluid_font_size_settings = isset( $preset['fluid'] ) ? $preset['fluid'] : null;
@@ -517,7 +521,6 @@ function gutenberg_get_typography_font_size_value( $preset, $should_use_fluid_ty
 	 */
 	if ( ! $minimum_font_size_raw ) {
 		$calculated_minimum_font_size = round( $preferred_size['value'] * $default_minimum_font_size_factor, 3 );
-
 		// Only use calculated min font size if it's > $minimum_font_size_limit value.
 		if ( ! empty( $minimum_font_size_limit ) && $calculated_minimum_font_size <= $minimum_font_size_limit['value'] ) {
 			$minimum_font_size_raw = $minimum_font_size_limit['value'] . $minimum_font_size_limit['unit'];
diff --git a/packages/block-editor/CHANGELOG.md b/packages/block-editor/CHANGELOG.md
index 21666d999c1d1..ca39d663eac86 100644
--- a/packages/block-editor/CHANGELOG.md
+++ b/packages/block-editor/CHANGELOG.md
@@ -9,6 +9,7 @@
 ### Enhancements
 
 -   `URLInput`: the `renderSuggestions` callback prop now receives `currentInputValue` as a new parameter ([45806](https://github.com/WordPress/gutenberg/pull/45806)).
+-   Fluid typography: add configurable fluid typography settings to theme.json ([#42489](https://github.com/WordPress/gutenberg/pull/42489)).
 
 ### Bug Fix
 
diff --git a/packages/edit-site/CHANGELOG.md b/packages/edit-site/CHANGELOG.md
index 83dcb848d66b3..da308d23e3a1f 100644
--- a/packages/edit-site/CHANGELOG.md
+++ b/packages/edit-site/CHANGELOG.md
@@ -4,7 +4,11 @@
 
 ### Breaking Changes
 
--   Updated dependencies to require React 18 ([45235](https://github.com/WordPress/gutenberg/pull/45235))
+-   Updated dependencies to require React 18 ([45235](https://github.com/WordPress/gutenberg/pull/45235)).
+
+### Enhancements
+
+-   Fluid typography: add configurable fluid typography settings to theme.json ([#42489](https://github.com/WordPress/gutenberg/pull/42489)).
 
 ## 4.19.0 (2022-11-16)
 
diff --git a/packages/edit-site/src/components/global-styles/test/typography-utils.js b/packages/edit-site/src/components/global-styles/test/typography-utils.js
index 647b02cb4be1f..9fbb693258314 100644
--- a/packages/edit-site/src/components/global-styles/test/typography-utils.js
+++ b/packages/edit-site/src/components/global-styles/test/typography-utils.js
@@ -7,7 +7,8 @@ describe( 'typography utils', () => {
 	describe( 'getTypographyFontSizeValue', () => {
 		[
 			{
-				message: 'returns value when fluid typography is deactivated',
+				message:
+					'should return value when fluid typography is not active',
 				preset: {
 					size: '28px',
 				},
@@ -16,7 +17,7 @@ describe( 'typography utils', () => {
 			},
 
 			{
-				message: 'returns value where font size is 0',
+				message: 'should return value where font size is 0',
 				preset: {
 					size: 0,
 				},
@@ -25,7 +26,7 @@ describe( 'typography utils', () => {
 			},
 
 			{
-				message: "returns value where font size is '0'",
+				message: "should return value where font size is '0'",
 				preset: {
 					size: '0',
 				},
@@ -34,7 +35,7 @@ describe( 'typography utils', () => {
 			},
 
 			{
-				message: 'returns value where `size` is `null`.',
+				message: 'should return value where `size` is `null`.',
 				preset: {
 					size: null,
 				},
@@ -43,7 +44,7 @@ describe( 'typography utils', () => {
 			},
 
 			{
-				message: 'returns value when fluid is `false`',
+				message: 'should return value when fluid is `false`',
 				preset: {
 					size: '28px',
 					fluid: false,
@@ -55,7 +56,7 @@ describe( 'typography utils', () => {
 			},
 
 			{
-				message: 'returns already clamped value',
+				message: 'should return already clamped value',
 				preset: {
 					size: 'clamp(21px, 1.313rem + ((1vw - 7.68px) * 2.524), 42px)',
 					fluid: false,
@@ -68,7 +69,7 @@ describe( 'typography utils', () => {
 			},
 
 			{
-				message: 'returns value with unsupported unit',
+				message: 'should return value with unsupported unit',
 				preset: {
 					size: '1000%',
 					fluid: false,
@@ -80,7 +81,7 @@ describe( 'typography utils', () => {
 			},
 
 			{
-				message: 'returns clamp value with rem min and max units',
+				message: 'should return clamp value with rem min and max units',
 				preset: {
 					size: '1.75rem',
 				},
@@ -92,7 +93,7 @@ describe( 'typography utils', () => {
 			},
 
 			{
-				message: 'returns clamp value with eem min and max units',
+				message: 'should return clamp value with eem min and max units',
 				preset: {
 					size: '1.75em',
 				},
@@ -104,7 +105,7 @@ describe( 'typography utils', () => {
 			},
 
 			{
-				message: 'returns clamp value for floats',
+				message: 'should return clamp value for floats',
 				preset: {
 					size: '100.175px',
 				},
@@ -116,7 +117,8 @@ describe( 'typography utils', () => {
 			},
 
 			{
-				message: 'coerces integer to `px` and returns clamp value',
+				message:
+					'should coerce integer to `px` and returns clamp value',
 				preset: {
 					size: 33,
 					fluid: true,
@@ -129,7 +131,7 @@ describe( 'typography utils', () => {
 			},
 
 			{
-				message: 'coerces float to `px` and returns clamp value',
+				message: 'should coerce float to `px` and returns clamp value',
 				preset: {
 					size: 100.23,
 					fluid: true,
@@ -142,7 +144,8 @@ describe( 'typography utils', () => {
 			},
 
 			{
-				message: 'returns clamp value when `fluid` is empty array',
+				message:
+					'should return clamp value when `fluid` is empty array',
 				preset: {
 					size: '28px',
 					fluid: [],
@@ -155,7 +158,7 @@ describe( 'typography utils', () => {
 			},
 
 			{
-				message: 'returns clamp value when `fluid` is `null`',
+				message: 'should return clamp value when `fluid` is `null`',
 				preset: {
 					size: '28px',
 					fluid: null,
@@ -169,7 +172,7 @@ describe( 'typography utils', () => {
 
 			{
 				message:
-					'returns clamp value if min font size is greater than max',
+					'should return clamp value if min font size is greater than max',
 				preset: {
 					size: '3rem',
 					fluid: {
@@ -185,7 +188,7 @@ describe( 'typography utils', () => {
 			},
 
 			{
-				message: 'returns value with invalid min/max fluid units',
+				message: 'should return value with invalid min/max fluid units',
 				preset: {
 					size: '10em',
 					fluid: {
@@ -201,7 +204,7 @@ describe( 'typography utils', () => {
 
 			{
 				message:
-					'returns value when size is < lower bounds and no fluid min/max set',
+					'should return value when size is < lower bounds and no fluid min/max set',
 				preset: {
 					size: '3px',
 				},
@@ -213,7 +216,7 @@ describe( 'typography utils', () => {
 
 			{
 				message:
-					'returns value when size is equal to lower bounds and no fluid min/max set',
+					'should return value when size is equal to lower bounds and no fluid min/max set',
 				preset: {
 					size: '14px',
 				},
@@ -224,7 +227,8 @@ describe( 'typography utils', () => {
 			},
 
 			{
-				message: 'returns clamp value with different min max units',
+				message:
+					'should return clamp value with different min max units',
 				preset: {
 					size: '28px',
 					fluid: {
@@ -240,7 +244,8 @@ describe( 'typography utils', () => {
 			},
 
 			{
-				message: 'returns clamp value where no fluid max size is set',
+				message:
+					'should return clamp value where no fluid max size is set',
 				preset: {
 					size: '28px',
 					fluid: {
@@ -255,7 +260,8 @@ describe( 'typography utils', () => {
 			},
 
 			{
-				message: 'returns clamp value where no fluid min size is set',
+				message:
+					'should return clamp value where no fluid min size is set',
 				preset: {
 					size: '28px',
 					fluid: {
@@ -320,7 +326,7 @@ describe( 'typography utils', () => {
 
 			{
 				message:
-					'returns clamp value when min and max font sizes are equal',
+					'should return clamp value when min and max font sizes are equal',
 				preset: {
 					size: '4rem',
 					fluid: {
@@ -333,8 +339,44 @@ describe( 'typography utils', () => {
 				},
 				expected: 'clamp(30px, 1.875rem + ((1vw - 7.68px) * 1), 30px)',
 			},
+
+			// Equivalent custom config PHP unit tests in `test_should_covert_font_sizes_to_fluid_values()`.
+			{
+				message: 'should return clamp value using custom fluid config',
+				preset: {
+					size: '50px',
+				},
+				typographySettings: {
+					fluid: {
+						minViewPortWidth: '1000px',
+						maxViewPortWidth: '2000px',
+						scaleFactor: 2,
+						minFontSizeFactor: 0.8,
+						minFontSize: '16px',
+					},
+				},
+				expected: 'clamp(40px, 2.5rem + ((1vw - 10px) * 2), 50px)',
+			},
+
+			{
+				message:
+					'should return value when font size <= custom min font size bound',
+				preset: {
+					size: '15px',
+				},
+				typographySettings: {
+					fluid: {
+						minViewPortWidth: '1000px',
+						maxViewPortWidth: '2000px',
+						scaleFactor: 2,
+						minFontSizeFactor: 0.8,
+						minFontSize: '16px',
+					},
+				},
+				expected: '15px',
+			},
 		].forEach( ( { message, preset, typographySettings, expected } ) => {
-			it( `should ${ message }`, () => {
+			it( `${ message }`, () => {
 				expect(
 					getTypographyFontSizeValue( preset, typographySettings )
 				).toBe( expected );
diff --git a/packages/edit-site/src/components/global-styles/typography-utils.js b/packages/edit-site/src/components/global-styles/typography-utils.js
index 57622a88f3299..8f7421eeb3cf8 100644
--- a/packages/edit-site/src/components/global-styles/typography-utils.js
+++ b/packages/edit-site/src/components/global-styles/typography-utils.js
@@ -55,7 +55,7 @@ export function getTypographyFontSizeValue( preset, typographySettings ) {
 	}
 
 	if (
-		true !== typographySettings?.fluid ||
+		! typographySettings?.fluid ||
 		( typeof typographySettings?.fluid === 'object' &&
 			Object.keys( typographySettings.fluid ).length === 0 )
 	) {
@@ -79,7 +79,7 @@ export function getTypographyFontSizeValue( preset, typographySettings ) {
 		minimumViewPortWidth: fluidTypographySettings?.minViewPortWidth,
 		maximumViewPortWidth: fluidTypographySettings?.maxViewPortWidth,
 		scaleFactor: fluidTypographySettings?.scaleFactor,
-		minimumFontSizeFactor: fluidTypographySettings?.minViewPortWidth,
+		minimumFontSizeFactor: fluidTypographySettings?.minFontSizeFactor,
 		minimumFontSizeLimit: fluidTypographySettings?.minFontSize,
 	} );
 
diff --git a/phpunit/block-supports/typography-test.php b/phpunit/block-supports/typography-test.php
index 63fd98d1e524f..eed620c040c86 100644
--- a/phpunit/block-supports/typography-test.php
+++ b/phpunit/block-supports/typography-test.php
@@ -614,15 +614,20 @@ public function test_should_covert_font_sizes_to_fluid_values( $font_size_value,
 	 */
 	public function data_generate_block_supports_font_size_fixtures() {
 		return array(
-			'default_return_value'               => array(
+			'returns value when fluid typography is not active'          => array(
 				'font_size_value'             => '50px',
 				'should_use_fluid_typography' => false,
 				'expected_output'             => 'font-size:50px;',
 			),
-			'return_value_with_fluid_typography' => array(
+			'returns clamp value using custom fluid config'              => array(
 				'font_size_value'             => '50px',
 				'should_use_fluid_typography' => true,
-				'expected_output'             => 'font-size:clamp(37.5px, 2.344rem + ((1vw - 7.68px) * 1.502), 50px);',
+				'expected_output'             => 'font-size:clamp(40px, 2.5rem + ((1vw - 10px) * 2), 50px);',
+			),
+			'returns value when font size <= custom min font size bound' => array(
+				'font_size_value'             => '15px',
+				'should_use_fluid_typography' => true,
+				'expected_output'             => 'font-size:15px;',
 			),
 		);
 	}
@@ -680,7 +685,7 @@ public function data_generate_replace_inline_font_styles_with_fluid_values_fixtu
 				'block_content'               => '<h2 class="has-vivid-red-background-color has-background has-link-color" style="margin-top:var(--wp--preset--spacing--60);font-size:4rem;font-style:normal;font-weight:600;letter-spacing:29px;text-decoration:underline;text-transform:capitalize">This is a heading</h2>',
 				'font_size_value'             => '4rem',
 				'should_use_fluid_typography' => true,
-				'expected_output'             => '<h2 class="has-vivid-red-background-color has-background has-link-color" style="margin-top:var(--wp--preset--spacing--60);font-size:clamp(3rem, 3rem + ((1vw - 0.48rem) * 1.923), 4rem);font-style:normal;font-weight:600;letter-spacing:29px;text-decoration:underline;text-transform:capitalize">This is a heading</h2>',
+				'expected_output'             => '<h2 class="has-vivid-red-background-color has-background has-link-color" style="margin-top:var(--wp--preset--spacing--60);font-size:clamp(3.2rem, 3.2rem + ((1vw - 0.625rem) * 2.56), 4rem);font-style:normal;font-weight:600;letter-spacing:29px;text-decoration:underline;text-transform:capitalize">This is a heading</h2>',
 			),
 			'return_content_if_no_inline_font_size_found'  => array(
 				'block_content'               => '<p class="has-medium-font-size" style="font-style:normal;font-weight:600;letter-spacing:29px;">A paragraph inside a group</p>',
@@ -698,13 +703,13 @@ public function data_generate_replace_inline_font_styles_with_fluid_values_fixtu
 				'block_content'               => '<p class="has-medium-font-size" style="    font-size:   20px   ;    ">A paragraph inside a group</p>',
 				'font_size_value'             => '20px',
 				'should_use_fluid_typography' => true,
-				'expected_output'             => '<p class="has-medium-font-size" style="    font-size:clamp(15px, 0.938rem + ((1vw - 7.68px) * 0.601), 20px);    ">A paragraph inside a group</p>',
+				'expected_output'             => '<p class="has-medium-font-size" style="    font-size:clamp(16px, 1rem + ((1vw - 10px) * 0.8), 20px);    ">A paragraph inside a group</p>',
 			),
 			'return_content_with_first_match_replace_only' => array(
 				'block_content'               => "<div class=\"wp-block-group\" style=\"font-size:1.5em\"> \n \n<p style=\"font-size:1.5em\">A paragraph inside a group</p></div>",
 				'font_size_value'             => '1.5em',
 				'should_use_fluid_typography' => true,
-				'expected_output'             => "<div class=\"wp-block-group\" style=\"font-size:clamp(1.125em, 1.125rem + ((1vw - 0.48em) * 0.721), 1.5em);\"> \n \n<p style=\"font-size:1.5em\">A paragraph inside a group</p></div>",
+				'expected_output'             => "<div class=\"wp-block-group\" style=\"font-size:clamp(1.2em, 1.2rem + ((1vw - 0.625em) * 0.96), 1.5em);\"> \n \n<p style=\"font-size:1.5em\">A paragraph inside a group</p></div>",
 			),
 		);
 	}
diff --git a/phpunit/data/themedir1/block-theme-child-with-fluid-typography/theme.json b/phpunit/data/themedir1/block-theme-child-with-fluid-typography/theme.json
index 1ddb6db02a1b2..c50eeb5da4342 100644
--- a/phpunit/data/themedir1/block-theme-child-with-fluid-typography/theme.json
+++ b/phpunit/data/themedir1/block-theme-child-with-fluid-typography/theme.json
@@ -6,8 +6,7 @@
 			"fluid": {
 				"maxViewPortWidth": "2000px",
 				"minViewPortWidth": "1000px",
-				"minFontSizeFactor": 1.5,
-				"maxFontSizeFactor": 2,
+				"minFontSizeFactor": 0.8,
 				"scaleFactor": 2,
 				"minFontSize": "16px"
 			}
diff --git a/schemas/json/theme.json b/schemas/json/theme.json
index d8767d5700781..c3936479a02cb 100644
--- a/schemas/json/theme.json
+++ b/schemas/json/theme.json
@@ -367,20 +367,20 @@
 											"type": "string"
 										},
 										"minViewPortWidth": {
-											"description": "Allow users to set custom a min viewport width in px, rem or em, used to set the minimum size boundary of a fluid font",
+											"description": "Allow users to set a custom min viewport width in px, rem or em, used to set the minimum size boundary of a fluid font",
 											"type": "string"
 										},
 										"minFontSizeFactor": {
 											"description": "Used to calculate a minimum font size from a single size value, where `fluidSize.min` is not set.",
 											"type": "number"
 										},
-										"maxFontSizeFactor": {
-											"description": "Used to calculate a maximum font size from a single size value, where `fluidSize.max` is not set.",
-											"type": "number"
-										},
 										"scaleFactor": {
 											"description": "Determines the rate of font size change between the minimum and maximum font sizes. The higher the value the faster the change.",
 											"type": "number"
+										},
+										"minFontSize": {
+											"description": "Allow users to set a global minimum font size boundary in px, rem or em. Custom font sizes below this value will not be clamped, and all calculated minimum font sizes will be, a at minimum, this value.",
+											"type": "string"
 										}
 									},
 									"additionalProperties": false

From 4ffc18e4d84f3555e6a300b05e4469a27fd8c64f Mon Sep 17 00:00:00 2001
From: ramonjd <ramonjd@gmail.com>
Date: Wed, 14 Dec 2022 14:45:49 +1100
Subject: [PATCH 09/15] Ensure that a theme's fluid font size settings are used
 when calculating custom font sizes and search block font sizes.

---
 packages/block-editor/README.md                   |  2 +-
 packages/block-editor/src/hooks/font-size.js      | 10 +++++-----
 .../src/hooks/use-typography-props.js             | 15 +++++++++++----
 packages/block-library/src/search/edit.js         |  4 ++--
 4 files changed, 19 insertions(+), 12 deletions(-)

diff --git a/packages/block-editor/README.md b/packages/block-editor/README.md
index a90eadbaf7e43..5a861eaa1acad 100644
--- a/packages/block-editor/README.md
+++ b/packages/block-editor/README.md
@@ -521,7 +521,7 @@ attributes.
 _Parameters_
 
 -   _attributes_ `Object`: Block attributes.
--   _isFluidFontSizeActive_ `boolean`: Whether the function should try to convert font sizes to fluid values.
+-   _fluidTypographySettings_ `Object|boolean`: If boolean, whether the function should try to convert font sizes to fluid values, otherwise an object containing theme fluid typography settings.
 
 _Returns_
 
diff --git a/packages/block-editor/src/hooks/font-size.js b/packages/block-editor/src/hooks/font-size.js
index fcfefdb789267..dfc0d9e91e866 100644
--- a/packages/block-editor/src/hooks/font-size.js
+++ b/packages/block-editor/src/hooks/font-size.js
@@ -329,8 +329,8 @@ function addEditPropsForFluidCustomFontSizes( blockType ) {
 				?.typography?.fluid;
 
 		const fluidTypographySettings =
-			typeof fluidTypographyConfig?.fluid === 'object'
-				? fluidTypographyConfig?.fluid
+			typeof fluidTypographyConfig === 'object'
+				? fluidTypographyConfig
 				: {};
 
 		const newFontSize =
@@ -343,9 +343,9 @@ function addEditPropsForFluidCustomFontSizes( blockType ) {
 							fluidTypographySettings?.maxViewPortWidth,
 						scaleFactor: fluidTypographySettings?.scaleFactor,
 						minimumFontSizeFactor:
-							fluidTypographySettings?.minViewPortWidth,
-						maximumFontSizeFactor:
-							fluidTypographySettings?.maxFontSizeFactor,
+							fluidTypographySettings?.minFontSizeFactor,
+						minimumFontSizeLimit:
+							fluidTypographySettings?.minFontSize,
 				  } )
 				: null;
 
diff --git a/packages/block-editor/src/hooks/use-typography-props.js b/packages/block-editor/src/hooks/use-typography-props.js
index d70ae08aafc59..af2cceaf35751 100644
--- a/packages/block-editor/src/hooks/use-typography-props.js
+++ b/packages/block-editor/src/hooks/use-typography-props.js
@@ -19,22 +19,29 @@ import { getComputedFluidTypographyValue } from '../components/font-sizes/fluid-
  * Provides the CSS class names and inline styles for a block's typography support
  * attributes.
  *
- * @param {Object}  attributes            Block attributes.
- * @param {boolean} isFluidFontSizeActive Whether the function should try to convert font sizes to fluid values.
+ * @param {Object}          attributes              Block attributes.
+ * @param {Object|boolean}  fluidTypographySettings If boolean, whether the function should try to convert font sizes to fluid values,
+ *                                                  otherwise an object containing theme fluid typography settings.
  *
  * @return {Object} Typography block support derived CSS classes & styles.
  */
 export function getTypographyClassesAndStyles(
 	attributes,
-	isFluidFontSizeActive
+	fluidTypographySettings = {}
 ) {
 	let typographyStyles = attributes?.style?.typography || {};
 
-	if ( isFluidFontSizeActive ) {
+	if ( !! fluidTypographySettings ) {
 		typographyStyles = {
 			...typographyStyles,
 			fontSize: getComputedFluidTypographyValue( {
 				fontSize: attributes?.style?.typography?.fontSize,
+				minimumViewPortWidth: fluidTypographySettings?.minViewPortWidth,
+				maximumViewPortWidth: fluidTypographySettings?.maxViewPortWidth,
+				scaleFactor: fluidTypographySettings?.scaleFactor,
+				minimumFontSizeFactor:
+					fluidTypographySettings?.minFontSizeFactor,
+				minimumFontSizeLimit: fluidTypographySettings?.minFontSize,
 			} ),
 		};
 	}
diff --git a/packages/block-library/src/search/edit.js b/packages/block-library/src/search/edit.js
index a3db69287f8f7..78ff685ff01fe 100644
--- a/packages/block-library/src/search/edit.js
+++ b/packages/block-library/src/search/edit.js
@@ -114,10 +114,10 @@ export default function SearchEdit( {
 	}
 
 	const colorProps = useColorProps( attributes );
-	const fluidTypographyEnabled = useSetting( 'typography.fluid' );
+	const fluidTypographySettings = useSetting( 'typography.fluid' );
 	const typographyProps = useTypographyProps(
 		attributes,
-		fluidTypographyEnabled
+		fluidTypographySettings
 	);
 	const unitControlInstanceId = useInstanceId( UnitControl );
 	const unitControlInputId = `wp-block-search__width-${ unitControlInstanceId }`;

From 8a3fb8fa4129ea034fca3b34b7002665b36809bf Mon Sep 17 00:00:00 2001
From: ramonjd <ramonjd@gmail.com>
Date: Wed, 14 Dec 2022 15:03:05 +1100
Subject: [PATCH 10/15] Validating incoming viewport widths and min font size
 against accepted units.

---
 lib/block-supports/typography.php               |  9 ++++++---
 .../src/components/font-sizes/fluid-utils.js    | 17 ++++++++++++++---
 2 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/lib/block-supports/typography.php b/lib/block-supports/typography.php
index 758cf4e5cbc65..93e5ba442040d 100644
--- a/lib/block-supports/typography.php
+++ b/lib/block-supports/typography.php
@@ -464,11 +464,14 @@ function gutenberg_get_typography_font_size_value( $preset, $should_use_fluid_ty
 	$fluid_settings = isset( $typography_settings['fluid'] ) && is_array( $typography_settings['fluid'] ) ? $typography_settings['fluid'] : array();
 
 	// Defaults.
-	$default_maximum_viewport_width   = isset( $fluid_settings['maxViewPortWidth'] ) ? $fluid_settings['maxViewPortWidth'] : '1600px';
-	$default_minimum_viewport_width   = isset( $fluid_settings['minViewPortWidth'] ) ? $fluid_settings['minViewPortWidth'] : '768px';
+	$default_maximum_viewport_width   = isset( $fluid_settings['maxViewPortWidth'] ) &&
+										! empty( gutenberg_get_typography_value_and_unit( $fluid_settings['maxViewPortWidth'] ) ) ? $fluid_settings['maxViewPortWidth'] : '1600px';
+	$default_minimum_viewport_width   = isset( $fluid_settings['minViewPortWidth'] ) &&
+										! empty( gutenberg_get_typography_value_and_unit( $fluid_settings['minViewPortWidth'] ) ) ? $fluid_settings['minViewPortWidth'] : '768px';
 	$default_minimum_font_size_factor = isset( $fluid_settings['minFontSizeFactor'] ) && is_numeric( $fluid_settings['minFontSizeFactor'] ) ? $fluid_settings['minFontSizeFactor'] : 0.75;
 	$default_scale_factor             = isset( $fluid_settings['scaleFactor'] ) && is_numeric( $fluid_settings['scaleFactor'] ) ? $fluid_settings['scaleFactor'] : 1;
-	$global_minimum_font_size         = isset( $fluid_settings['minFontSize'] ) ? $fluid_settings['minFontSize'] : '14px';
+	$global_minimum_font_size         = isset( $fluid_settings['minFontSize'] ) &&
+										! empty( gutenberg_get_typography_value_and_unit( $fluid_settings['minFontSize'] ) ) ? $fluid_settings['minFontSize'] : '14px';
 
 	// Font sizes.
 	$fluid_font_size_settings = isset( $preset['fluid'] ) ? $preset['fluid'] : null;
diff --git a/packages/block-editor/src/components/font-sizes/fluid-utils.js b/packages/block-editor/src/components/font-sizes/fluid-utils.js
index 3cc6d434901c6..2c081460ae63b 100644
--- a/packages/block-editor/src/components/font-sizes/fluid-utils.js
+++ b/packages/block-editor/src/components/font-sizes/fluid-utils.js
@@ -48,12 +48,23 @@ export function getComputedFluidTypographyValue( {
 	minimumFontSize,
 	maximumFontSize,
 	fontSize,
-	minimumViewPortWidth = DEFAULT_MINIMUM_VIEWPORT_WIDTH,
-	maximumViewPortWidth = DEFAULT_MAXIMUM_VIEWPORT_WIDTH,
+	minimumViewPortWidth,
+	maximumViewPortWidth,
 	scaleFactor = DEFAULT_SCALE_FACTOR,
 	minimumFontSizeFactor = DEFAULT_MINIMUM_FONT_SIZE_FACTOR,
-	minimumFontSizeLimit = DEFAULT_MINIMUM_FONT_SIZE_LIMIT,
+	minimumFontSizeLimit,
 } ) {
+	// Defaults.
+	minimumViewPortWidth = !! getTypographyValueAndUnit( minimumViewPortWidth )
+		? minimumViewPortWidth
+		: DEFAULT_MINIMUM_VIEWPORT_WIDTH;
+	maximumViewPortWidth = !! getTypographyValueAndUnit( maximumViewPortWidth )
+		? maximumViewPortWidth
+		: DEFAULT_MAXIMUM_VIEWPORT_WIDTH;
+	minimumFontSizeLimit = !! getTypographyValueAndUnit( minimumFontSizeLimit )
+		? minimumFontSizeLimit
+		: DEFAULT_MINIMUM_FONT_SIZE_LIMIT;
+
 	/*
 	 * Calculates missing minimumFontSize and maximumFontSize from
 	 * defaultFontSize if provided.

From 7775602867cda04345c2eece64deec4c94586409 Mon Sep 17 00:00:00 2001
From: ramonjd <ramonjd@gmail.com>
Date: Wed, 14 Dec 2022 15:16:36 +1100
Subject: [PATCH 11/15] Ensure we check for fluid settings validity in
 getTypographyClassesAndStyles

---
 .../src/hooks/test/use-typography-props.js    | 30 +++++++++++++++++++
 .../src/hooks/use-typography-props.js         | 14 +++++----
 2 files changed, 39 insertions(+), 5 deletions(-)

diff --git a/packages/block-editor/src/hooks/test/use-typography-props.js b/packages/block-editor/src/hooks/test/use-typography-props.js
index 00557881467ca..aec09a137b40a 100644
--- a/packages/block-editor/src/hooks/test/use-typography-props.js
+++ b/packages/block-editor/src/hooks/test/use-typography-props.js
@@ -47,4 +47,34 @@ describe( 'getTypographyClassesAndStyles', () => {
 			},
 		} );
 	} );
+
+	it( 'should return configured fluid font size styles', () => {
+		const attributes = {
+			fontFamily: 'tofu',
+			style: {
+				typography: {
+					textDecoration: 'underline',
+					fontSize: '2rem',
+					textTransform: 'uppercase',
+				},
+			},
+		};
+		expect(
+			getTypographyClassesAndStyles( attributes, {
+				minViewPortWidth: '900px',
+				maxViewPortWidth: '1900px',
+				scaleFactor: 2,
+				minFontSizeFactor: 0.9,
+				minFontSize: '1rem',
+			} )
+		).toEqual( {
+			className: 'has-tofu-font-family',
+			style: {
+				textDecoration: 'underline',
+				fontSize:
+					'clamp(1.8rem, 1.8rem + ((1vw - 0.563rem) * 0.64), 2rem)',
+				textTransform: 'uppercase',
+			},
+		} );
+	} );
 } );
diff --git a/packages/block-editor/src/hooks/use-typography-props.js b/packages/block-editor/src/hooks/use-typography-props.js
index af2cceaf35751..8123785dbf052 100644
--- a/packages/block-editor/src/hooks/use-typography-props.js
+++ b/packages/block-editor/src/hooks/use-typography-props.js
@@ -19,19 +19,23 @@ import { getComputedFluidTypographyValue } from '../components/font-sizes/fluid-
  * Provides the CSS class names and inline styles for a block's typography support
  * attributes.
  *
- * @param {Object}          attributes              Block attributes.
- * @param {Object|boolean}  fluidTypographySettings If boolean, whether the function should try to convert font sizes to fluid values,
- *                                                  otherwise an object containing theme fluid typography settings.
+ * @param {Object}         attributes              Block attributes.
+ * @param {Object|boolean} fluidTypographySettings If boolean, whether the function should try to convert font sizes to fluid values,
+ *                                                 otherwise an object containing theme fluid typography settings.
  *
  * @return {Object} Typography block support derived CSS classes & styles.
  */
 export function getTypographyClassesAndStyles(
 	attributes,
-	fluidTypographySettings = {}
+	fluidTypographySettings
 ) {
 	let typographyStyles = attributes?.style?.typography || {};
 
-	if ( !! fluidTypographySettings ) {
+	if (
+		!! fluidTypographySettings &&
+		( true === fluidTypographySettings ||
+			Object.keys( fluidTypographySettings ).length !== 0 )
+	) {
 		typographyStyles = {
 			...typographyStyles,
 			fontSize: getComputedFluidTypographyValue( {

From 642b3c70b49174d09425477cd6039e91a3e3934b Mon Sep 17 00:00:00 2001
From: ramonjd <ramonjd@gmail.com>
Date: Thu, 15 Dec 2022 10:31:48 +1100
Subject: [PATCH 12/15] Rolling back configurable values to the global minimum
 font size only. Updating tests.

---
 lib/block-supports/typography.php             | 19 +++---
 packages/block-editor/CHANGELOG.md            |  2 +-
 .../src/components/font-sizes/fluid-utils.js  | 12 +---
 packages/block-editor/src/hooks/font-size.js  |  7 --
 packages/edit-site/CHANGELOG.md               |  2 +-
 .../global-styles/test/typography-utils.js    | 12 +---
 .../global-styles/typography-utils.js         |  4 --
 phpunit/block-supports/typography-test.php    | 56 ++++++++-------
 .../style.css                                 |  8 +++
 .../theme.json                                | 11 +++
 .../theme.json                                |  8 +--
 schemas/json/theme.json                       | 68 ++++---------------
 12 files changed, 80 insertions(+), 129 deletions(-)
 create mode 100644 phpunit/data/themedir1/block-theme-child-with-fluid-typography-config/style.css
 create mode 100644 phpunit/data/themedir1/block-theme-child-with-fluid-typography-config/theme.json

diff --git a/lib/block-supports/typography.php b/lib/block-supports/typography.php
index 93e5ba442040d..37956b9e8f2ac 100644
--- a/lib/block-supports/typography.php
+++ b/lib/block-supports/typography.php
@@ -359,7 +359,7 @@ function gutenberg_get_typography_value_and_unit( $raw_value, $options = array()
  * }
  * @return string|null A font-size value using clamp().
  */
-function gutenberg_get_computed_fluid_font_size_value( $args = array() ) {
+function gutenberg_get_computed_fluid_typography_value( $args = array() ) {
 	$maximum_viewport_width_raw = isset( $args['maximum_viewport_width'] ) ? $args['maximum_viewport_width'] : null;
 	$minimum_viewport_width_raw = isset( $args['minimum_viewport_width'] ) ? $args['minimum_viewport_width'] : null;
 	$maximum_font_size_raw      = isset( $args['maximum_font_size'] ) ? $args['maximum_font_size'] : null;
@@ -464,13 +464,11 @@ function gutenberg_get_typography_font_size_value( $preset, $should_use_fluid_ty
 	$fluid_settings = isset( $typography_settings['fluid'] ) && is_array( $typography_settings['fluid'] ) ? $typography_settings['fluid'] : array();
 
 	// Defaults.
-	$default_maximum_viewport_width   = isset( $fluid_settings['maxViewPortWidth'] ) &&
-										! empty( gutenberg_get_typography_value_and_unit( $fluid_settings['maxViewPortWidth'] ) ) ? $fluid_settings['maxViewPortWidth'] : '1600px';
-	$default_minimum_viewport_width   = isset( $fluid_settings['minViewPortWidth'] ) &&
-										! empty( gutenberg_get_typography_value_and_unit( $fluid_settings['minViewPortWidth'] ) ) ? $fluid_settings['minViewPortWidth'] : '768px';
-	$default_minimum_font_size_factor = isset( $fluid_settings['minFontSizeFactor'] ) && is_numeric( $fluid_settings['minFontSizeFactor'] ) ? $fluid_settings['minFontSizeFactor'] : 0.75;
-	$default_scale_factor             = isset( $fluid_settings['scaleFactor'] ) && is_numeric( $fluid_settings['scaleFactor'] ) ? $fluid_settings['scaleFactor'] : 1;
-	$global_minimum_font_size         = isset( $fluid_settings['minFontSize'] ) &&
+	$default_maximum_viewport_width   = '1600px';
+	$default_minimum_viewport_width   = '768px';
+	$default_minimum_font_size_factor = 0.75;
+	$default_scale_factor             = 1;
+	$default_minimum_font_size_limit  = isset( $fluid_settings['minFontSize'] ) &&
 										! empty( gutenberg_get_typography_value_and_unit( $fluid_settings['minFontSize'] ) ) ? $fluid_settings['minFontSize'] : '14px';
 
 	// Font sizes.
@@ -495,7 +493,7 @@ function gutenberg_get_typography_font_size_value( $preset, $should_use_fluid_ty
 
 	// Parses the minimum font size limit, so we can perform checks using it.
 	$minimum_font_size_limit = gutenberg_get_typography_value_and_unit(
-		$global_minimum_font_size,
+		$default_minimum_font_size_limit,
 		array(
 			'coerce_to' => $preferred_size['unit'],
 		)
@@ -524,6 +522,7 @@ function gutenberg_get_typography_font_size_value( $preset, $should_use_fluid_ty
 	 */
 	if ( ! $minimum_font_size_raw ) {
 		$calculated_minimum_font_size = round( $preferred_size['value'] * $default_minimum_font_size_factor, 3 );
+
 		// Only use calculated min font size if it's > $minimum_font_size_limit value.
 		if ( ! empty( $minimum_font_size_limit ) && $calculated_minimum_font_size <= $minimum_font_size_limit['value'] ) {
 			$minimum_font_size_raw = $minimum_font_size_limit['value'] . $minimum_font_size_limit['unit'];
@@ -532,7 +531,7 @@ function gutenberg_get_typography_font_size_value( $preset, $should_use_fluid_ty
 		}
 	}
 
-	$fluid_font_size_value = gutenberg_get_computed_fluid_font_size_value(
+	$fluid_font_size_value = gutenberg_get_computed_fluid_typography_value(
 		array(
 			'minimum_viewport_width' => $default_minimum_viewport_width,
 			'maximum_viewport_width' => $default_maximum_viewport_width,
diff --git a/packages/block-editor/CHANGELOG.md b/packages/block-editor/CHANGELOG.md
index ca39d663eac86..34cd726c55fdf 100644
--- a/packages/block-editor/CHANGELOG.md
+++ b/packages/block-editor/CHANGELOG.md
@@ -9,7 +9,7 @@
 ### Enhancements
 
 -   `URLInput`: the `renderSuggestions` callback prop now receives `currentInputValue` as a new parameter ([45806](https://github.com/WordPress/gutenberg/pull/45806)).
--   Fluid typography: add configurable fluid typography settings to theme.json ([#42489](https://github.com/WordPress/gutenberg/pull/42489)).
+-   Fluid typography: add configurable fluid typography settings for minimum font size to theme.json ([#42489](https://github.com/WordPress/gutenberg/pull/42489)).
 
 ### Bug Fix
 
diff --git a/packages/block-editor/src/components/font-sizes/fluid-utils.js b/packages/block-editor/src/components/font-sizes/fluid-utils.js
index 2c081460ae63b..f5816e9823d7a 100644
--- a/packages/block-editor/src/components/font-sizes/fluid-utils.js
+++ b/packages/block-editor/src/components/font-sizes/fluid-utils.js
@@ -48,19 +48,13 @@ export function getComputedFluidTypographyValue( {
 	minimumFontSize,
 	maximumFontSize,
 	fontSize,
-	minimumViewPortWidth,
-	maximumViewPortWidth,
+	minimumViewPortWidth = DEFAULT_MINIMUM_VIEWPORT_WIDTH,
+	maximumViewPortWidth = DEFAULT_MAXIMUM_VIEWPORT_WIDTH,
 	scaleFactor = DEFAULT_SCALE_FACTOR,
 	minimumFontSizeFactor = DEFAULT_MINIMUM_FONT_SIZE_FACTOR,
 	minimumFontSizeLimit,
 } ) {
-	// Defaults.
-	minimumViewPortWidth = !! getTypographyValueAndUnit( minimumViewPortWidth )
-		? minimumViewPortWidth
-		: DEFAULT_MINIMUM_VIEWPORT_WIDTH;
-	maximumViewPortWidth = !! getTypographyValueAndUnit( maximumViewPortWidth )
-		? maximumViewPortWidth
-		: DEFAULT_MAXIMUM_VIEWPORT_WIDTH;
+	// Validate incoming settings and set defaults.
 	minimumFontSizeLimit = !! getTypographyValueAndUnit( minimumFontSizeLimit )
 		? minimumFontSizeLimit
 		: DEFAULT_MINIMUM_FONT_SIZE_LIMIT;
diff --git a/packages/block-editor/src/hooks/font-size.js b/packages/block-editor/src/hooks/font-size.js
index dfc0d9e91e866..0c7a71fd23d68 100644
--- a/packages/block-editor/src/hooks/font-size.js
+++ b/packages/block-editor/src/hooks/font-size.js
@@ -337,13 +337,6 @@ function addEditPropsForFluidCustomFontSizes( blockType ) {
 			fontSize && !! fluidTypographyConfig
 				? getComputedFluidTypographyValue( {
 						fontSize,
-						minimumViewPortWidth:
-							fluidTypographySettings?.minViewPortWidth,
-						maximumViewPortWidth:
-							fluidTypographySettings?.maxViewPortWidth,
-						scaleFactor: fluidTypographySettings?.scaleFactor,
-						minimumFontSizeFactor:
-							fluidTypographySettings?.minFontSizeFactor,
 						minimumFontSizeLimit:
 							fluidTypographySettings?.minFontSize,
 				  } )
diff --git a/packages/edit-site/CHANGELOG.md b/packages/edit-site/CHANGELOG.md
index da308d23e3a1f..357668d600d11 100644
--- a/packages/edit-site/CHANGELOG.md
+++ b/packages/edit-site/CHANGELOG.md
@@ -8,7 +8,7 @@
 
 ### Enhancements
 
--   Fluid typography: add configurable fluid typography settings to theme.json ([#42489](https://github.com/WordPress/gutenberg/pull/42489)).
+-   Fluid typography: add configurable fluid typography settings for minimum font size to theme.json ([#42489](https://github.com/WordPress/gutenberg/pull/42489)).
 
 ## 4.19.0 (2022-11-16)
 
diff --git a/packages/edit-site/src/components/global-styles/test/typography-utils.js b/packages/edit-site/src/components/global-styles/test/typography-utils.js
index 9fbb693258314..a788a55d73d34 100644
--- a/packages/edit-site/src/components/global-styles/test/typography-utils.js
+++ b/packages/edit-site/src/components/global-styles/test/typography-utils.js
@@ -344,18 +344,14 @@ describe( 'typography utils', () => {
 			{
 				message: 'should return clamp value using custom fluid config',
 				preset: {
-					size: '50px',
+					size: '17px',
 				},
 				typographySettings: {
 					fluid: {
-						minViewPortWidth: '1000px',
-						maxViewPortWidth: '2000px',
-						scaleFactor: 2,
-						minFontSizeFactor: 0.8,
 						minFontSize: '16px',
 					},
 				},
-				expected: 'clamp(40px, 2.5rem + ((1vw - 10px) * 2), 50px)',
+				expected: 'clamp(16px, 1rem + ((1vw - 7.68px) * 0.12), 17px)',
 			},
 
 			{
@@ -366,10 +362,6 @@ describe( 'typography utils', () => {
 				},
 				typographySettings: {
 					fluid: {
-						minViewPortWidth: '1000px',
-						maxViewPortWidth: '2000px',
-						scaleFactor: 2,
-						minFontSizeFactor: 0.8,
 						minFontSize: '16px',
 					},
 				},
diff --git a/packages/edit-site/src/components/global-styles/typography-utils.js b/packages/edit-site/src/components/global-styles/typography-utils.js
index 8f7421eeb3cf8..5720fdeb6ce91 100644
--- a/packages/edit-site/src/components/global-styles/typography-utils.js
+++ b/packages/edit-site/src/components/global-styles/typography-utils.js
@@ -76,10 +76,6 @@ export function getTypographyFontSizeValue( preset, typographySettings ) {
 		minimumFontSize: preset?.fluid?.min,
 		maximumFontSize: preset?.fluid?.max,
 		fontSize: defaultSize,
-		minimumViewPortWidth: fluidTypographySettings?.minViewPortWidth,
-		maximumViewPortWidth: fluidTypographySettings?.maxViewPortWidth,
-		scaleFactor: fluidTypographySettings?.scaleFactor,
-		minimumFontSizeFactor: fluidTypographySettings?.minFontSizeFactor,
 		minimumFontSizeLimit: fluidTypographySettings?.minFontSize,
 	} );
 
diff --git a/phpunit/block-supports/typography-test.php b/phpunit/block-supports/typography-test.php
index eed620c040c86..1b9b6f97c63f6 100644
--- a/phpunit/block-supports/typography-test.php
+++ b/phpunit/block-supports/typography-test.php
@@ -557,22 +557,18 @@ public function data_generate_font_size_preset_fixtures() {
 	/**
 	 * Tests that custom font sizes are converted to fluid values
 	 * in inline block supports styles,
-	 * when "settings.typography.fluid" is set to `true`.
+	 * when "settings.typography.fluid" is set to `true` or contains configured values.
 	 *
 	 * @covers ::gutenberg_register_typography_support
 	 *
 	 * @dataProvider data_generate_block_supports_font_size_fixtures
 	 *
-	 * @param string $font_size_value             The block supports custom font size value.
-	 * @param bool   $should_use_fluid_typography An override to switch fluid typography "on". Can be used for unit testing.
-	 * @param string $expected_output             Expected value of style property from gutenberg_apply_typography_support().
+	 * @param string $font_size_value The block supports custom font size value.
+	 * @param string $theme_slug      A theme slug corresponding to an available test theme.
+	 * @param string $expected_output Expected value of style property from gutenberg_apply_typography_support().
 	 */
-	public function test_should_covert_font_sizes_to_fluid_values( $font_size_value, $should_use_fluid_typography, $expected_output ) {
-		if ( $should_use_fluid_typography ) {
-			switch_theme( 'block-theme-child-with-fluid-typography' );
-		} else {
-			switch_theme( 'default' );
-		}
+	public function test_should_covert_font_sizes_to_fluid_values( $font_size_value, $theme_slug, $expected_output ) {
+		switch_theme( $theme_slug );
 
 		$this->test_block_name = 'test/font-size-fluid-value';
 		register_block_type(
@@ -614,20 +610,30 @@ public function test_should_covert_font_sizes_to_fluid_values( $font_size_value,
 	 */
 	public function data_generate_block_supports_font_size_fixtures() {
 		return array(
-			'returns value when fluid typography is not active'          => array(
-				'font_size_value'             => '50px',
-				'should_use_fluid_typography' => false,
-				'expected_output'             => 'font-size:50px;',
-			),
-			'returns clamp value using custom fluid config'              => array(
-				'font_size_value'             => '50px',
-				'should_use_fluid_typography' => true,
-				'expected_output'             => 'font-size:clamp(40px, 2.5rem + ((1vw - 10px) * 2), 50px);',
+			'returns value when fluid typography is not active' => array(
+				'font_size_value' => '15px',
+				'theme_slug'      => 'default',
+				'expected_output' => 'font-size:15px;',
+			),
+			'returns clamp value using default config' => array(
+				'font_size_value' => '15px',
+				'theme_slug'      => 'block-theme-child-with-fluid-typography',
+				'expected_output' => 'font-size:clamp(14px, 0.875rem + ((1vw - 7.68px) * 0.12), 15px);',
+			),
+			'returns value when font size <= default min font size bound' => array(
+				'font_size_value' => '13px',
+				'theme_slug'      => 'block-theme-child-with-fluid-typography',
+				'expected_output' => 'font-size:13px;',
+			),
+			'returns clamp value using custom fluid config' => array(
+				'font_size_value' => '17px',
+				'theme_slug'      => 'block-theme-child-with-fluid-typography-config',
+				'expected_output' => 'font-size:clamp(16px, 1rem + ((1vw - 7.68px) * 0.12), 17px);',
 			),
 			'returns value when font size <= custom min font size bound' => array(
-				'font_size_value'             => '15px',
-				'should_use_fluid_typography' => true,
-				'expected_output'             => 'font-size:15px;',
+				'font_size_value' => '15px',
+				'theme_slug'      => 'block-theme-child-with-fluid-typography-config',
+				'expected_output' => 'font-size:15px;',
 			),
 		);
 	}
@@ -685,7 +691,7 @@ public function data_generate_replace_inline_font_styles_with_fluid_values_fixtu
 				'block_content'               => '<h2 class="has-vivid-red-background-color has-background has-link-color" style="margin-top:var(--wp--preset--spacing--60);font-size:4rem;font-style:normal;font-weight:600;letter-spacing:29px;text-decoration:underline;text-transform:capitalize">This is a heading</h2>',
 				'font_size_value'             => '4rem',
 				'should_use_fluid_typography' => true,
-				'expected_output'             => '<h2 class="has-vivid-red-background-color has-background has-link-color" style="margin-top:var(--wp--preset--spacing--60);font-size:clamp(3.2rem, 3.2rem + ((1vw - 0.625rem) * 2.56), 4rem);font-style:normal;font-weight:600;letter-spacing:29px;text-decoration:underline;text-transform:capitalize">This is a heading</h2>',
+				'expected_output'             => '<h2 class="has-vivid-red-background-color has-background has-link-color" style="margin-top:var(--wp--preset--spacing--60);font-size:clamp(3rem, 3rem + ((1vw - 0.48rem) * 1.923), 4rem);font-style:normal;font-weight:600;letter-spacing:29px;text-decoration:underline;text-transform:capitalize">This is a heading</h2>',
 			),
 			'return_content_if_no_inline_font_size_found'  => array(
 				'block_content'               => '<p class="has-medium-font-size" style="font-style:normal;font-weight:600;letter-spacing:29px;">A paragraph inside a group</p>',
@@ -703,13 +709,13 @@ public function data_generate_replace_inline_font_styles_with_fluid_values_fixtu
 				'block_content'               => '<p class="has-medium-font-size" style="    font-size:   20px   ;    ">A paragraph inside a group</p>',
 				'font_size_value'             => '20px',
 				'should_use_fluid_typography' => true,
-				'expected_output'             => '<p class="has-medium-font-size" style="    font-size:clamp(16px, 1rem + ((1vw - 10px) * 0.8), 20px);    ">A paragraph inside a group</p>',
+				'expected_output'             => '<p class="has-medium-font-size" style="    font-size:clamp(15px, 0.938rem + ((1vw - 7.68px) * 0.601), 20px);    ">A paragraph inside a group</p>',
 			),
 			'return_content_with_first_match_replace_only' => array(
 				'block_content'               => "<div class=\"wp-block-group\" style=\"font-size:1.5em\"> \n \n<p style=\"font-size:1.5em\">A paragraph inside a group</p></div>",
 				'font_size_value'             => '1.5em',
 				'should_use_fluid_typography' => true,
-				'expected_output'             => "<div class=\"wp-block-group\" style=\"font-size:clamp(1.2em, 1.2rem + ((1vw - 0.625em) * 0.96), 1.5em);\"> \n \n<p style=\"font-size:1.5em\">A paragraph inside a group</p></div>",
+				'expected_output'             => "<div class=\"wp-block-group\" style=\"font-size:clamp(1.125em, 1.125rem + ((1vw - 0.48em) * 0.721), 1.5em);\"> \n \n<p style=\"font-size:1.5em\">A paragraph inside a group</p></div>",
 			),
 		);
 	}
diff --git a/phpunit/data/themedir1/block-theme-child-with-fluid-typography-config/style.css b/phpunit/data/themedir1/block-theme-child-with-fluid-typography-config/style.css
new file mode 100644
index 0000000000000..19abbecf86f4c
--- /dev/null
+++ b/phpunit/data/themedir1/block-theme-child-with-fluid-typography-config/style.css
@@ -0,0 +1,8 @@
+/*
+Theme Name: Block Theme Child Theme With Fluid Typography
+Theme URI: https://wordpress.org/
+Description: For testing purposes only.
+Template: block-theme
+Version: 1.0.0
+Text Domain: block-theme-child-with-fluid-typography
+*/
diff --git a/phpunit/data/themedir1/block-theme-child-with-fluid-typography-config/theme.json b/phpunit/data/themedir1/block-theme-child-with-fluid-typography-config/theme.json
new file mode 100644
index 0000000000000..d0ec32d9caac0
--- /dev/null
+++ b/phpunit/data/themedir1/block-theme-child-with-fluid-typography-config/theme.json
@@ -0,0 +1,11 @@
+{
+	"version": 2,
+	"settings": {
+		"appearanceTools": true,
+		"typography": {
+			"fluid": {
+				"minFontSize": "16px"
+			}
+		}
+	}
+}
diff --git a/phpunit/data/themedir1/block-theme-child-with-fluid-typography/theme.json b/phpunit/data/themedir1/block-theme-child-with-fluid-typography/theme.json
index c50eeb5da4342..93234766eddd2 100644
--- a/phpunit/data/themedir1/block-theme-child-with-fluid-typography/theme.json
+++ b/phpunit/data/themedir1/block-theme-child-with-fluid-typography/theme.json
@@ -3,13 +3,7 @@
 	"settings": {
 		"appearanceTools": true,
 		"typography": {
-			"fluid": {
-				"maxViewPortWidth": "2000px",
-				"minViewPortWidth": "1000px",
-				"minFontSizeFactor": 0.8,
-				"scaleFactor": 2,
-				"minFontSize": "16px"
-			}
+			"fluid": true
 		}
 	}
 }
diff --git a/schemas/json/theme.json b/schemas/json/theme.json
index c3936479a02cb..d734926219308 100644
--- a/schemas/json/theme.json
+++ b/schemas/json/theme.json
@@ -234,12 +234,8 @@
 						"blockGap": {
 							"description": "Enables `--wp--style--block-gap` to be generated from styles.spacing.blockGap.\nA value of `null` instead of `false` further disables layout styles from being generated.",
 							"oneOf": [
-								{
-									"type": "boolean"
-								},
-								{
-									"type": "null"
-								}
+								{ "type": "boolean" },
+								{ "type": "null" }
 							],
 							"default": null
 						},
@@ -362,22 +358,6 @@
 								{
 									"type": "object",
 									"properties": {
-										"maxViewPortWidth": {
-											"description": "Allow users to set custom a max viewport width in px, rem or em, used to set the maximum size boundary of a fluid font.",
-											"type": "string"
-										},
-										"minViewPortWidth": {
-											"description": "Allow users to set a custom min viewport width in px, rem or em, used to set the minimum size boundary of a fluid font",
-											"type": "string"
-										},
-										"minFontSizeFactor": {
-											"description": "Used to calculate a minimum font size from a single size value, where `fluidSize.min` is not set.",
-											"type": "number"
-										},
-										"scaleFactor": {
-											"description": "Determines the rate of font size change between the minimum and maximum font sizes. The higher the value the faster the change.",
-											"type": "number"
-										},
 										"minFontSize": {
 											"description": "Allow users to set a global minimum font size boundary in px, rem or em. Custom font sizes below this value will not be clamped, and all calculated minimum font sizes will be, a at minimum, this value.",
 											"type": "string"
@@ -594,27 +574,13 @@
 		},
 		"settingsProperties": {
 			"allOf": [
-				{
-					"$ref": "#/definitions/settingsPropertiesAppearanceTools"
-				},
-				{
-					"$ref": "#/definitions/settingsPropertiesBorder"
-				},
-				{
-					"$ref": "#/definitions/settingsPropertiesColor"
-				},
-				{
-					"$ref": "#/definitions/settingsPropertiesLayout"
-				},
-				{
-					"$ref": "#/definitions/settingsPropertiesSpacing"
-				},
-				{
-					"$ref": "#/definitions/settingsPropertiesTypography"
-				},
-				{
-					"$ref": "#/definitions/settingsPropertiesCustom"
-				}
+				{ "$ref": "#/definitions/settingsPropertiesAppearanceTools" },
+				{ "$ref": "#/definitions/settingsPropertiesBorder" },
+				{ "$ref": "#/definitions/settingsPropertiesColor" },
+				{ "$ref": "#/definitions/settingsPropertiesLayout" },
+				{ "$ref": "#/definitions/settingsPropertiesSpacing" },
+				{ "$ref": "#/definitions/settingsPropertiesTypography" },
+				{ "$ref": "#/definitions/settingsPropertiesCustom" }
 			]
 		},
 		"settingsPropertiesComplete": {
@@ -676,21 +642,13 @@
 								}
 							}
 						},
-						{
-							"$ref": "#/definitions/settingsPropertiesColor"
-						},
-						{
-							"$ref": "#/definitions/settingsPropertiesLayout"
-						},
-						{
-							"$ref": "#/definitions/settingsPropertiesSpacing"
-						},
+						{ "$ref": "#/definitions/settingsPropertiesColor" },
+						{ "$ref": "#/definitions/settingsPropertiesLayout" },
+						{ "$ref": "#/definitions/settingsPropertiesSpacing" },
 						{
 							"$ref": "#/definitions/settingsPropertiesTypography"
 						},
-						{
-							"$ref": "#/definitions/settingsPropertiesCustom"
-						}
+						{ "$ref": "#/definitions/settingsPropertiesCustom" }
 					]
 				},
 				"core/buttons": {

From dff191db402be97d3ddbb3fd7d8007ad0a6c7e65 Mon Sep 17 00:00:00 2001
From: ramonjd <ramonjd@gmail.com>
Date: Thu, 15 Dec 2022 11:01:04 +1100
Subject: [PATCH 13/15] Remove config assignment from
 getTypographyClassesAndStyles and updated tests.

---
 .../src/hooks/test/use-typography-props.js        |  6 +-----
 .../src/hooks/use-typography-props.js             | 15 ++++++---------
 2 files changed, 7 insertions(+), 14 deletions(-)

diff --git a/packages/block-editor/src/hooks/test/use-typography-props.js b/packages/block-editor/src/hooks/test/use-typography-props.js
index aec09a137b40a..12336eb2c44af 100644
--- a/packages/block-editor/src/hooks/test/use-typography-props.js
+++ b/packages/block-editor/src/hooks/test/use-typography-props.js
@@ -61,10 +61,6 @@ describe( 'getTypographyClassesAndStyles', () => {
 		};
 		expect(
 			getTypographyClassesAndStyles( attributes, {
-				minViewPortWidth: '900px',
-				maxViewPortWidth: '1900px',
-				scaleFactor: 2,
-				minFontSizeFactor: 0.9,
 				minFontSize: '1rem',
 			} )
 		).toEqual( {
@@ -72,7 +68,7 @@ describe( 'getTypographyClassesAndStyles', () => {
 			style: {
 				textDecoration: 'underline',
 				fontSize:
-					'clamp(1.8rem, 1.8rem + ((1vw - 0.563rem) * 0.64), 2rem)',
+					'clamp(1.5rem, 1.5rem + ((1vw - 0.48rem) * 0.962), 2rem)',
 				textTransform: 'uppercase',
 			},
 		} );
diff --git a/packages/block-editor/src/hooks/use-typography-props.js b/packages/block-editor/src/hooks/use-typography-props.js
index 8123785dbf052..da5869ad9aec0 100644
--- a/packages/block-editor/src/hooks/use-typography-props.js
+++ b/packages/block-editor/src/hooks/use-typography-props.js
@@ -36,17 +36,14 @@ export function getTypographyClassesAndStyles(
 		( true === fluidTypographySettings ||
 			Object.keys( fluidTypographySettings ).length !== 0 )
 	) {
-		typographyStyles = {
-			...typographyStyles,
-			fontSize: getComputedFluidTypographyValue( {
+		const newFontSize =
+			getComputedFluidTypographyValue( {
 				fontSize: attributes?.style?.typography?.fontSize,
-				minimumViewPortWidth: fluidTypographySettings?.minViewPortWidth,
-				maximumViewPortWidth: fluidTypographySettings?.maxViewPortWidth,
-				scaleFactor: fluidTypographySettings?.scaleFactor,
-				minimumFontSizeFactor:
-					fluidTypographySettings?.minFontSizeFactor,
 				minimumFontSizeLimit: fluidTypographySettings?.minFontSize,
-			} ),
+			} ) || attributes?.style?.typography?.fontSize;
+		typographyStyles = {
+			...typographyStyles,
+			fontSize: newFontSize,
 		};
 	}
 

From d9531c2c1b9b912ea6f4f5c477f146d7eafaa319 Mon Sep 17 00:00:00 2001
From: ramonjd <ramonjd@gmail.com>
Date: Thu, 15 Dec 2022 11:16:59 +1100
Subject: [PATCH 14/15] Adding frontend test for unsupported units in min font
 size config

---
 .../global-styles/test/typography-utils.js        | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/packages/edit-site/src/components/global-styles/test/typography-utils.js b/packages/edit-site/src/components/global-styles/test/typography-utils.js
index a788a55d73d34..9d0213cb53e55 100644
--- a/packages/edit-site/src/components/global-styles/test/typography-utils.js
+++ b/packages/edit-site/src/components/global-styles/test/typography-utils.js
@@ -340,6 +340,21 @@ describe( 'typography utils', () => {
 				expected: 'clamp(30px, 1.875rem + ((1vw - 7.68px) * 1), 30px)',
 			},
 
+			{
+				message:
+					'should use default min font size value where min font size unit in fluid config is not supported',
+				preset: {
+					size: '15px',
+				},
+				typographySettings: {
+					fluid: {
+						minFontSize: '16%',
+					},
+				},
+				expected:
+					'clamp(14px, 0.875rem + ((1vw - 7.68px) * 0.12), 15px)',
+			},
+
 			// Equivalent custom config PHP unit tests in `test_should_covert_font_sizes_to_fluid_values()`.
 			{
 				message: 'should return clamp value using custom fluid config',

From a998a1b3e24ce7caa4f7d22befe6c8e3a4af3b59 Mon Sep 17 00:00:00 2001
From: ramonjd <ramonjd@gmail.com>
Date: Thu, 15 Dec 2022 14:56:51 +1100
Subject: [PATCH 15/15] simplifying condition so that it's readable in screen
 widths < 100000px

---
 lib/block-supports/typography.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/block-supports/typography.php b/lib/block-supports/typography.php
index 37956b9e8f2ac..809fba1a6e7ac 100644
--- a/lib/block-supports/typography.php
+++ b/lib/block-supports/typography.php
@@ -468,8 +468,8 @@ function gutenberg_get_typography_font_size_value( $preset, $should_use_fluid_ty
 	$default_minimum_viewport_width   = '768px';
 	$default_minimum_font_size_factor = 0.75;
 	$default_scale_factor             = 1;
-	$default_minimum_font_size_limit  = isset( $fluid_settings['minFontSize'] ) &&
-										! empty( gutenberg_get_typography_value_and_unit( $fluid_settings['minFontSize'] ) ) ? $fluid_settings['minFontSize'] : '14px';
+	$has_min_font_size                = isset( $fluid_settings['minFontSize'] ) && ! empty( gutenberg_get_typography_value_and_unit( $fluid_settings['minFontSize'] ) );
+	$default_minimum_font_size_limit  = $has_min_font_size ? $fluid_settings['minFontSize'] : '14px';
 
 	// Font sizes.
 	$fluid_font_size_settings = isset( $preset['fluid'] ) ? $preset['fluid'] : null;