[Webkit-unassigned] [Bug 163477] New: @media queries in shadow root not evaluated

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=163477

            Bug ID: 163477
           Summary: @media queries in shadow root not evaluated
    Classification: Unclassified
           Product: WebKit
           Version: Safari 10
          Hardware: Unspecified
                OS: macOS 10.12
            Status: NEW
          Severity: Critical
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jshcrowthe at gmail.com

Please take a look at the following JSBin in Safa:

http://jsbin.com/hokayuc/53/edit?html,output

In the above code I am defining a custom element `card-swiper`. In the template for this element, I am using a @media query to control the `flex-wrap` property of my `.slot-container` class.

The @media query is completely ignored in Safari 10, Safari TP, and Webkit.

Chrome functions as expected.

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