[Falkon] [Bug 492364] New: css :is ignored

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https://bugs.kde.org/show_bug.cgi?id=492364

            Bug ID: 492364
           Summary: css :is ignored
    Classification: Applications
           Product: Falkon
           Version: 3.2.0
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: rupert.levene at ucd.ie
  Target Milestone: ---

Created attachment 173087
  --> https://bugs.kde.org/attachment.cgi?id=173087&action=edit
demo html file

SUMMARY

The CSS :is pseudo-class appears to be ignored by Falkon.

STEPS TO REPRODUCE
1. Go to https://developer.mozilla.org/en-US/docs/Web/CSS/:is and look at the
CSS Demo. Or load the attached file.

OBSERVED RESULT

The list renders as entirely blue in Falkon. 

EXPECTED RESULT

The list renders in blue, green and orange, like it does in Firefox.

SOFTWARE/OS VERSIONS
Ubuntu 22.04
Falkon application version 3.2.0, Ubuntu package version 3.2.0+dfsg1-1
QtWebEngine version 5.15.3

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