[Webkit-unassigned] [Bug 160331] New: Shadow DOM V1 does not apply styles

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=160331

            Bug ID: 160331
           Summary: Shadow DOM V1 does not apply styles
    Classification: Unclassified
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: Other
            Status: NEW
          Severity: Blocker
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: treshugart at gmail.com

Created attachment 284846
  --> https://bugs.webkit.org/attachment.cgi?id=284846&action=review
Safari 10 left, Chrome 54 right

I'm running macOS Sierra and using Safari 10. I'm using a custom element polyfill for v1 along with native Shadow DOM v1 and no styles are getting picked up at all. I've added style tags to the shadow roots. Things work fine in Chrome Canary (native v1). See http://skate.js.org and inspect the shadow roots to debug it. I've attached a side-by-side screenshot of Safari 10 and Chrome 54 running the same page.

I've raised this as a blocker because if it is in fact an issue, Shadow DOM is unusable. I also raised this under CSS because there is no component for Shadow DOM or Web Component it seems.

Thanks!

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