[Webkit-unassigned] [Bug 197726] New: <main> not supported attachShadow

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197726

            Bug ID: 197726
           Summary: <main> not supported attachShadow
           Product: WebKit
           Version: Safari 12
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: steven at sklambert.com

When trying to call `attachShadow` on a `<main>` element, Safari v12.1 and Safari Technology Preview throw an error: `NotSupportedError: The operation is not supported` even though `<main>` is a valid `attachShadow` target (https://dom.spec.whatwg.org/#dom-element-attachshadow).

Test case: https://codepen.io/straker/pen/eapxaw

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