w3c/csswg-drafts

[cssom-view] elementFromPoint etc need to be defined in terms of layout and visual viewports

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#1,378 opened on May 15, 2017

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Description

https://www.w3.org/TR/cssom-view-1/#dom-document-elementfrompoint

elementFromPoint(), elementsFromPoint() and caretPositionFromPoint() need to define whether the arguments are relative to the layout or visual viewports. Other "client" coordinates are being defined as being in terms of the layout viewport (e.g. getBoundingClientRects(), getClientRects(), event.clientX/y [citation needed]).

The spec also needs to define whether the clipping to the the viewport uses the layout or visual viewports for clipping.

Contributor guide

Research direction
Analyze the CSSOM View specification to determine how 'client' coordinates are defined for other methods like getBoundingClientRects and event.clientX, and propose similar definitions for elementFromPoint, elementsFromPoint, and caretPositionFromPoint. Also clarify which viewport (layout or visual) is used for clipping.
Tech stack
css
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.
1-2 days
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
CSS
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30