[Webkit-unassigned] [Bug 163921] New: getSelection() method on DocumentOrShadowRoot is not implemented in ShadowRoot

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=163921

            Bug ID: 163921
           Summary: getSelection() method on DocumentOrShadowRoot is not
                    implemented in ShadowRoot
    Classification: Unclassified
           Product: WebKit
           Version: Safari 10
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Major
          Priority: P2
         Component: HTML DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: treshugart at gmail.com
                CC: cdumez at apple.com

Created attachment 292676
  --> https://bugs.webkit.org/attachment.cgi?id=292676&action=review
console tests

We're wrapping a web component around ProseMirror that has an editor inside of a shadow root. In order to get ProseMirror working with native Shadow DOM, we made a PR that uses getSelection() on the DocumentOrShadowRoot interface (which ShadowRoot should implement). However, we've run into issues in Safari 10 where this isn't working and upon investigation it seems Safari doesn't fully implement the Shadow DOM spec here.

This is a critical issue for us. Is there somewhere we can easily find what Safari hasn't implemented yet so we don't keep running into these issues? Thanks!

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