diff --git a/crates/swc_css_parser/tests/fixture/at-rule/import/output.json b/crates/swc_css_parser/tests/fixture/at-rule/import/output.json
index 0251ea8ee94d..4337a9fcdd16 100644
--- a/crates/swc_css_parser/tests/fixture/at-rule/import/output.json
+++ b/crates/swc_css_parser/tests/fixture/at-rule/import/output.json
@@ -9257,7 +9257,7 @@
                     "end": 4781,
                     "ctxt": 0
                   },
-                  "value": "DISPLAY",
+                  "value": "display",
                   "raw": "DISPLAY"
                 },
                 "value": [
diff --git a/crates/swc_css_parser/tests/fixture/important/basic/output.json b/crates/swc_css_parser/tests/fixture/important/basic/output.json
index 7ffa61813383..096b388f3872 100644
--- a/crates/swc_css_parser/tests/fixture/important/basic/output.json
+++ b/crates/swc_css_parser/tests/fixture/important/basic/output.json
@@ -453,7 +453,7 @@
                   "end": 219,
                   "ctxt": 0
                 },
-                "value": "IMPORTANT",
+                "value": "important",
                 "raw": "IMPORTANT"
               }
             }
@@ -501,7 +501,7 @@
                   "end": 251,
                   "ctxt": 0
                 },
-                "value": "IMPORTANT",
+                "value": "important",
                 "raw": "IMPORTANT"
               }
             }
@@ -930,7 +930,7 @@
                   "end": 519,
                   "ctxt": 0
                 },
-                "value": "iMpOrTaNt",
+                "value": "important",
                 "raw": "iMpOrTaNt"
               }
             }
diff --git a/crates/swc_css_parser/tests/fixture/vendor/rome/at-page/output.json b/crates/swc_css_parser/tests/fixture/vendor/rome/at-page/output.json
index e9825b1f0028..fed665b0414a 100644
--- a/crates/swc_css_parser/tests/fixture/vendor/rome/at-page/output.json
+++ b/crates/swc_css_parser/tests/fixture/vendor/rome/at-page/output.json
@@ -651,7 +651,7 @@
                       "end": 234,
                       "ctxt": 0
                     },
-                    "value": "CONTENT",
+                    "value": "content",
                     "raw": "CONTENT"
                   },
                   "value": [
@@ -685,7 +685,7 @@
                 "end": 255,
                 "ctxt": 0
               },
-              "value": "MARGIN-LEFT",
+              "value": "margin-left",
               "raw": "MARGIN-LEFT"
             },
             "value": [
diff --git a/crates/swc_css_parser/tests/fixture/vendor/rome/at-page/page-properties-case-insensitive/output.json b/crates/swc_css_parser/tests/fixture/vendor/rome/at-page/page-properties-case-insensitive/output.json
index 3f223676c08b..4d85a7d2da6c 100644
--- a/crates/swc_css_parser/tests/fixture/vendor/rome/at-page/page-properties-case-insensitive/output.json
+++ b/crates/swc_css_parser/tests/fixture/vendor/rome/at-page/page-properties-case-insensitive/output.json
@@ -55,7 +55,7 @@
                 "end": 17,
                 "ctxt": 0
               },
-              "value": "DISPLAY",
+              "value": "display",
               "raw": "DISPLAY"
             },
             "value": [