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

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

Tech stack
csshtml
Domain
frontendaccessibility
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
over 1 week
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
understanding of shadow DOMfamiliarity with CSSOM specs
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20
Research direction
Investigate the current behavior of elementFromPoint and elementsFromPoint in shadow DOM contexts. The issue references the shadow DOM specification and the retarget algorithm. Consider linking to the CSSOM View spec and DOM spec sections. Review existing comments for proposed solutions. The goal is to update the CSSOM View spec to not return elements inside shadow trees but instead return the shadow host.
[cssom-view] elementFromPoint, elementsFromPoint, and caretPositionFromPoint should not return an element inside a shadow tree · w3c/csswg-drafts#556 | Good First Issue