[Webkit-unassigned] [Bug 213171] New: [WPT] infrastructure/assumptions/html-elements.html fails due to changes in style when all: initial is used

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=213171

            Bug ID: 213171
           Summary: [WPT] infrastructure/assumptions/html-elements.html
                    fails due to changes in style when all: initial is
                    used
           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: sam at webkit.org

Created attachment 401845

  --> https://bugs.webkit.org/attachment.cgi?id=401845&action=review

Testcase

WPT: infrastructure/assumptions/html-elements.html fails due to changes in style when all: initial is used.

Test: https://wpt.fyi/results/infrastructure/assumptions/html-elements.html?run_id=586650004&run_id=579020002&run_id=594530003&run_id=583030005

Issue: For the simple tree:

<style>
span.b {
  all: initial;
}
</style>
<span class="a"><span>
<span class="b"><span>

The computed values of the two spans differ for two properties: "stroke-color" and "-webkit-mask-box-image-slice"

Attached reduction / reproduction which tests all the computed properties for both spans. (Unselect the "Pass" checkbox to just see the two failing cases).

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