[Webkit-unassigned] [Bug 157471] New: -webkit-isolate incorrectly measures width of inline elements

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=157471

            Bug ID: 157471
           Summary: -webkit-isolate incorrectly measures width of inline
                    elements
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: hartman.wiki at gmail.com

Created attachment 278399
  --> https://bugs.webkit.org/attachment.cgi?id=278399&action=review
Page with css statement applied

Although the tab lockup of #148573 seems fixed in Safari 9, it seems that it is incorrectly measuring the width of inline elements (spanning multiple lines ???). Content overflows outside of the expected boundaries and random spacing is introduced between words.

Attached are a screenshot of a page with -webkit-isolate enabled on the .comment class, a screenshot with the rule disabled and a webarchive of the page.

This problem does not occur in Chrome.

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