CSSTidy
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Properties not being supported
As a quick test I've tried using some css properties and notice that they are not in the data.inc.php file (sorry - don't know which CSS they relate to).
grid-area grid-template-columns grid-template-rows grid-template-areas (important note - these require line breaks to be retained) -ms-grid-columns -ms-grid-column -ms-grid-column-span -ms-grid-rows -ms-grid-row -ms-flex-line-pack align-content -webkit-transition -o-transition -webkit-touch-callout -webkit-user-select -khtml-user-select -moz-user-select -ms-user-select user-select -webkit-appearance
No support for CSS4 indeed