caretPositionFromPoint is only defined for Document #9439
Merged
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Spec: https://drafts.csswg.org/cssom-view/#extensions-to-the-document-interface
The only implementor, Firefox, considers this for ShadowRoot in https://bugzilla.mozilla.org/show_bug.cgi?id=1430307 but there is no spec for it.
Edit: Also the claim that Firefox 63 implements ShadowRoot.caretPositionFromPoint seems to be false.