diff --git a/docs/src/selectors.md b/docs/src/selectors.md
index f0dba4fdd9559..ffd16b77ce24a 100644
--- a/docs/src/selectors.md
+++ b/docs/src/selectors.md
@@ -765,9 +765,10 @@ Attributes supported by the role selector:
   Note that unlike most other attributes, `disabled` is inherited through the DOM hierarchy.
   Learn more about [`aria-disabled`](https://www.w3.org/TR/wai-aria-1.2/#aria-disabled).
 
-* `expanded` - a boolean attribute that is usually set by `aria-expanded`. Examples:
+* `expanded` - an attribute that is usually set by `aria-expanded`. Available values for expanded are `true`, `false` and `"none"`. Examples:
   - `role=button[expanded=true]`, equivalent to `role=button[expanded]`
   - `role=button[expanded=false]`
+  - `role=button[expanded="none"]`, meaning that `aria-expanded` is not present
 
   Learn more about [`aria-expanded`](https://www.w3.org/TR/wai-aria-1.2/#aria-expanded).
 
diff --git a/packages/playwright-core/src/server/injected/roleSelectorEngine.ts b/packages/playwright-core/src/server/injected/roleSelectorEngine.ts
index 3e4d1ac5e9c51..170dc5cc2f131 100644
--- a/packages/playwright-core/src/server/injected/roleSelectorEngine.ts
+++ b/packages/playwright-core/src/server/injected/roleSelectorEngine.ts
@@ -70,8 +70,13 @@ function validateAttributes(attrs: AttributeSelectorPart[], role: string) {
       }
       case 'expanded': {
         validateSupportedRole(attr.name, kAriaExpandedRoles, role);
-        validateSupportedValues(attr, [true, false]);
+        validateSupportedValues(attr, [true, false, 'none']);
         validateSupportedOp(attr, ['<truthy>', '=']);
+        if (attr.op === '<truthy>') {
+          // Do not match "none" in "treeitem[expanded]".
+          attr.op = '=';
+          attr.value = true;
+        }
         break;
       }
       case 'level': {
diff --git a/packages/playwright-core/src/server/injected/roleUtils.ts b/packages/playwright-core/src/server/injected/roleUtils.ts
index 7c4ea0a2450b9..9d9c1be95c73e 100644
--- a/packages/playwright-core/src/server/injected/roleUtils.ts
+++ b/packages/playwright-core/src/server/injected/roleUtils.ts
@@ -670,14 +670,20 @@ export function getAriaPressed(element: Element): boolean | 'mixed' {
 }
 
 export const kAriaExpandedRoles = ['application', 'button', 'checkbox', 'combobox', 'gridcell', 'link', 'listbox', 'menuitem', 'row', 'rowheader', 'tab', 'treeitem', 'columnheader', 'menuitemcheckbox', 'menuitemradio', 'rowheader', 'switch'];
-export function getAriaExpanded(element: Element): boolean {
+export function getAriaExpanded(element: Element): boolean | 'none' {
   // https://www.w3.org/TR/wai-aria-1.2/#aria-expanded
   // https://www.w3.org/TR/html-aam-1.0/#html-attribute-state-and-property-mappings
   if (element.tagName === 'DETAILS')
     return (element as HTMLDetailsElement).open;
-  if (kAriaExpandedRoles.includes(getAriaRole(element) || ''))
-    return getAriaBoolean(element.getAttribute('aria-expanded')) === true;
-  return false;
+  if (kAriaExpandedRoles.includes(getAriaRole(element) || '')) {
+    const expanded = element.getAttribute('aria-expanded');
+    if (expanded === null)
+      return 'none';
+    if (expanded === 'true')
+      return true;
+    return false;
+  }
+  return 'none';
 }
 
 export const kAriaLevelRoles = ['heading', 'listitem', 'row', 'treeitem'];
diff --git a/tests/page/selectors-role.spec.ts b/tests/page/selectors-role.spec.ts
index 0ea07f17c56d3..7813102b53a03 100644
--- a/tests/page/selectors-role.spec.ts
+++ b/tests/page/selectors-role.spec.ts
@@ -169,26 +169,41 @@ test('should support pressed', async ({ page }) => {
 
 test('should support expanded', async ({ page }) => {
   await page.setContent(`
-    <button>Hi</button>
-    <button aria-expanded="true">Hello</button>
-    <button aria-expanded="false">Bye</button>
+    <div role="treeitem">Hi</div>
+    <div role="treeitem" aria-expanded="true">Hello</div>
+    <div role="treeitem" aria-expanded="false">Bye</div>
   `);
-  expect(await page.locator(`role=button[expanded]`).evaluateAll(els => els.map(e => e.outerHTML))).toEqual([
-    `<button aria-expanded="true">Hello</button>`,
+
+  expect(await page.locator('role=treeitem').evaluateAll(els => els.map(e => e.outerHTML))).toEqual([
+    `<div role="treeitem">Hi</div>`,
+    `<div role="treeitem" aria-expanded="true">Hello</div>`,
+    `<div role="treeitem" aria-expanded="false">Bye</div>`,
   ]);
-  expect(await page.locator(`role=button[expanded=true]`).evaluateAll(els => els.map(e => e.outerHTML))).toEqual([
-    `<button aria-expanded="true">Hello</button>`,
+  expect(await page.getByRole('treeitem').evaluateAll(els => els.map(e => e.outerHTML))).toEqual([
+    `<div role="treeitem">Hi</div>`,
+    `<div role="treeitem" aria-expanded="true">Hello</div>`,
+    `<div role="treeitem" aria-expanded="false">Bye</div>`,
   ]);
-  expect(await page.getByRole('button', { expanded: true }).evaluateAll(els => els.map(e => e.outerHTML))).toEqual([
-    `<button aria-expanded="true">Hello</button>`,
+
+  expect(await page.locator(`role=treeitem[expanded]`).evaluateAll(els => els.map(e => e.outerHTML))).toEqual([
+    `<div role="treeitem" aria-expanded="true">Hello</div>`,
   ]);
-  expect(await page.locator(`role=button[expanded=false]`).evaluateAll(els => els.map(e => e.outerHTML))).toEqual([
-    `<button>Hi</button>`,
-    `<button aria-expanded="false">Bye</button>`,
+  expect(await page.locator(`role=treeitem[expanded=true]`).evaluateAll(els => els.map(e => e.outerHTML))).toEqual([
+    `<div role="treeitem" aria-expanded="true">Hello</div>`,
   ]);
-  expect(await page.getByRole('button', { expanded: false }).evaluateAll(els => els.map(e => e.outerHTML))).toEqual([
-    `<button>Hi</button>`,
-    `<button aria-expanded="false">Bye</button>`,
+  expect(await page.getByRole('treeitem', { expanded: true }).evaluateAll(els => els.map(e => e.outerHTML))).toEqual([
+    `<div role="treeitem" aria-expanded="true">Hello</div>`,
+  ]);
+
+  expect(await page.locator(`role=treeitem[expanded=false]`).evaluateAll(els => els.map(e => e.outerHTML))).toEqual([
+    `<div role="treeitem" aria-expanded="false">Bye</div>`,
+  ]);
+  expect(await page.getByRole('treeitem', { expanded: false }).evaluateAll(els => els.map(e => e.outerHTML))).toEqual([
+    `<div role="treeitem" aria-expanded="false">Bye</div>`,
+  ]);
+
+  expect(await page.locator(`role=treeitem[expanded="none"]`).evaluateAll(els => els.map(e => e.outerHTML))).toEqual([
+    `<div role="treeitem">Hi</div>`,
   ]);
 });
 
@@ -403,4 +418,7 @@ test('errors', async ({ page }) => {
 
   const e7 = await page.$('role=button[name]').catch(e => e);
   expect(e7.message).toContain(`"name" attribute must have a value`);
+
+  const e8 = await page.$('role=treeitem[expanded="bar"]').catch(e => e);
+  expect(e8.message).toContain(`"expanded" must be one of true, false, "none"`);
 });