[Webkit-unassigned] [Bug 173876] New: Details-Summary Element causes rem font-size to be miscalculated for follow-up content

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=173876

            Bug ID: 173876
           Summary: Details-Summary Element causes rem font-size to be
                    miscalculated for follow-up content
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: All
                OS: macOS 10.13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: info at anselm-hannemann.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    t.tom at succont.de, zalan at apple.com

Created attachment 313914

  --> https://bugs.webkit.org/attachment.cgi?id=313914&action=review

Reduced Test Case for details-element rem font-size rendering bug

I just discovered a very weird issue with the `details` and `summary` elements in Safari / WebKit. 

When adding a details and summary element to a web page, follow up content will be mis-rendered due to miscalculation in the font-size. The misrendering only affects elements that are calculated based on rem-units.

Note that the issue disappears when triggering a repaint (opening DevTools or window resize, not SplitView, not orientationchange in responsive mode but on real device) after page load.

Please see the reduced test case attached for more information.

Cheers,
Anselm

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