Containment Module L2 (WD, 2020-06-03)

edit/codemirror-default.js

@@ -105,6 +105,7 @@
   }
 
   Object.assign(CodeMirror.mimeModes['text/css'].propertyKeywords, {
+    'content-visibility': true,
     'overflow-anchor': true,
     'overscroll-behavior': true,
   });

vendor-overwrites/csslint/parserlib.js

@@ -286,6 +286,7 @@ self.parserlib = (() => {
     'columns':           1,
     'contain':           'none | strict | content | [ size || layout || style || paint ]',
     'content':           'normal | none | <content-list> [ / <string> ]?',
+    'content-visibility': 'visible | auto | hidden',
     'counter-increment': 1,
     'counter-reset':     1,
     'crop':              'rect() | inset-rect() | auto',