diff --git a/edit/codemirror-default.js b/edit/codemirror-default.js
index 1157e699..86089864 100644
--- a/edit/codemirror-default.js
+++ b/edit/codemirror-default.js
@@ -105,6 +105,13 @@
   Object.assign(CodeMirror.mimeModes['text/css'].propertyKeywords, {
     'mix-blend-mode': true,
     'isolation': true,
+    // nonstandard https://compat.spec.whatwg.org/
+    'box-reflect': true,
+    'text-fill-color': true,
+    'text-stroke': true,
+    'text-stroke-color': true,
+    'text-stroke-width': true,
+    // end
   });
   Object.assign(CodeMirror.mimeModes['text/css'].valueKeywords, {
     'isolate': true,
diff --git a/vendor-overwrites/csslint/parserlib.js b/vendor-overwrites/csslint/parserlib.js
index ee0ea4fa..c661844c 100644
--- a/vendor-overwrites/csslint/parserlib.js
+++ b/vendor-overwrites/csslint/parserlib.js
@@ -603,6 +603,13 @@ self.parserlib = (() => {
     // Z
     'z-index': '<integer> | auto',
     'zoom':    '<number> | <percentage> | normal',
+
+    // nonstandard https://compat.spec.whatwg.org/
+    '-webkit-box-reflect':       '[ above | below | right | left ]? <length>? <image>?',
+    '-webkit-text-fill-color':   '<color>',
+    '-webkit-text-stroke':       '<border-width> || <color>',
+    '-webkit-text-stroke-color': '<color>',
+    '-webkit-text-stroke-width': '<border-width>',
   };
 
   //endregion