w3c/csswg-drafts

[cssom-view] elementFromPoint, elementsFromPoint, and caretPositionFromPoint should not return an element inside a shadow tree

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#556 opened on Sep 30, 2016

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Help WantedNeeds EditsNeeds Testcase (WPT)cssom-view-1topic: shadow

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Description

elementFromPoint and elementsFromPoint should not return an element inside a shadow tree. Instead, it should look for the highest shadow host of the element and return that instead so that it doesn't leak an element in shadow trees.

See the shadow DOM specification.

More precisely, once these methods are added on DocumentOrShadowRoot interface, then we need to retarget the element we found against the context object.

Contributor guide

Research direction
Read the retargeting algorithm in the DOM spec and apply it to the elementFromPoint etc. methods in CSSOM spec.
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None
Domain
frontendapi
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
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Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Git
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65