Accept non-standard css properties in PyCharm?

I have the following rule

    .selectable { /* double click -> select (not text-selection) */
        -webkit-touch-callout: none;
        -webkit-user-select: none;
        -khtml-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;
        user-select: none;
        cursor: pointer;

where every property (except cursor) shows with a red squiggly line in the PyCharm editor and the message "Unknown CSS property -webkit-touch-callout..".

I understand that user-select is non-standard, but is there a way to tell PyCharm that I've understood the warning and please stop nagging me about it?


You need to enable Ignore vendor specific CSS properties option:

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