[Webkit-unassigned] [Bug 169706] New: Shadow element styles based on host attributes do not update

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=169706

            Bug ID: 169706
           Summary: Shadow element styles based on host attributes do not
                    update
    Classification: Unclassified
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jan at component.kitchen
                CC: cdumez at apple.com

See http://jsbin.com/gubocem/edit?html,output

Expect: Clicking the indicated element updates its `toggle` attribute, which should in turn apply a style rule changing the background color. This works as expected in Chrome.

Actual: Clicking the element updates the attribute, but not the style. Using the inspector to manually disable the rule for `background` and re-enable it causes the rule to be applied as expected.

We've encountered various flavors of this bug before: https://bugs.webkit.org/show_bug.cgi?id=112869 and https://bugs.webkit.org/show_bug.cgi?id=158900.

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