[Webkit-unassigned] [Bug 218561] New: REGRESSION (r257839): Miscomputed style due to computed 'rem' value in matched declaration cache

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=218561

            Bug ID: 218561
           Summary: REGRESSION (r257839): Miscomputed style due to
                    computed 'rem' value in matched declaration cache
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: koivisto at iki.fi

Call to focus() causes computed style update for the element’s ancestor chain before the the document has otherwise been styled (using the shortcut mechanism introduced in r257839). This style, which uses ‘rem’ unit and so depends on root element font size, gets cached in MatchedDeclarationsCache. The root font size then changes but during the resulting style update we use this cached value, failing to re-resolve ‘rem’.

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