Bug 1667122 - Make CSS tests work when math-style is disabled. r=emilio

Differential Revision: https://phabricator.services.mozilla.com/D91387

browser/base/content/test/static/browser_parsable_css.js

@@ -61,6 +61,15 @@ let whitelist = [
   },
 ];
 
+if (!Services.prefs.getBoolPref("layout.css.math-style.enabled")) {
+  // mathml.css UA sheet rule for math-style.
+  whitelist.push({
+    sourceName: /(?:res|gre-resources)\/mathml\.css$/i,
+    errorMessage: /Unknown property .*\bmath-style\b/i,
+    isFromDevTools: false,
+  });
+}
+
 if (
   !Services.prefs.getBoolPref(
     "layout.css.xul-box-display-values.content.enabled"

layout/style/test/property_database.js

@@ -9141,14 +9141,6 @@ var gCSSProperties = {
     other_values: ["url(#mysym)"],
     invalid_values: [],
   },
-  "math-style": {
-    domProp: "mathStyle",
-    inherited: true,
-    type: CSS_TYPE_LONGHAND,
-    initial_values: ["normal"],
-    other_values: ["compact"],
-    invalid_values: [],
-  },
   "mix-blend-mode": {
     domProp: "mixBlendMode",
     inherited: false,
@@ -13396,6 +13388,17 @@ if (IsCSSPropertyPrefEnabled("layout.css.aspect-ratio.enabled")) {
   };
 }
 
+if (IsCSSPropertyPrefEnabled("layout.css.math-style.enabled")) {
+  gCSSProperties["math-style"] = {
+    domProp: "mathStyle",
+    inherited: true,
+    type: CSS_TYPE_LONGHAND,
+    initial_values: ["normal"],
+    other_values: ["compact"],
+    invalid_values: [],
+  };
+}
+
 // Copy aliased properties' fields from their alias targets. Keep this logic
 // at the bottom of this file to ensure all the aliased properties are
 // processed.