Bug 1573725: turn on the pref for text-decoration-thickness on by default (in early-beta and earlier) r=dholbert

Differential Revision: https://phabricator.services.mozilla.com/D41883

--HG--
extra : moz-landing-system : lando

devtools/shared/css/generated/properties-db.js

@@ -9989,6 +9989,20 @@ exports.CSS_PROPERTIES = {
       "wavy"
     ]
   },
+  "text-decoration-thickness": {
+    "isInherited": false,
+    "subproperties": [
+      "text-decoration-thickness"
+    ],
+    "supports": [],
+    "values": [
+      "auto",
+      "inherit",
+      "initial",
+      "revert",
+      "unset"
+    ]
+  },
   "text-emphasis": {
     "isInherited": true,
     "subproperties": [

modules/libpref/init/StaticPrefList.yaml

@@ -4062,7 +4062,7 @@
 # text decoration thickness
 - name: layout.css.text-decoration-thickness.enabled
   type: bool
-  value: false
+  value: @IS_EARLY_BETA_OR_EARLIER@
   mirror: always
 
 # text decoration skip ink

testing/web-platform/tests/css/css-text-decor/parsing/text-decoration-invalid.html

@@ -7,9 +7,6 @@
 <script src="/resources/testharnessreport.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
 <script>
-test_invalid_value("text-decoration", "auto");
-test_invalid_value("text-decoration", "1px");
-
 test_invalid_value("text-decoration", "double overline underline dotted");
 test_invalid_value("text-decoration", "red line-through green");
 test_invalid_value("text-decoration", "overline blue underline");