[GTK] display:none has no effect on <optgroup> 
https://bugs.webkit.org/show_bug.cgi?id=206347
Summary [GTK] display:none has no effect on <optgroup>
Adrian Perez
Reported 2020-01-16 04:40:04 PST
This is a follow-up to bug #81882 (which is the same for <option>). There is one WPT test case which also covers <optgroup>: http://wpt.live/css/css-display/select-4-option-optgroup-display-none.html (Thanks to Carlos López for pointing out the test case.)
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