w3c / w3c/csswg-drafts

[resize-observer] Cross-document observing

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resize-observer-1
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Description

https://drafts.csswg.org/resize-observer-1/#dom-resizeobserver-observe

Does resizeObserver allow you to observe an element in another (same-origin) document? IntersectionObserver does, and there's some amount of code complexity associated with it. Should resizeObserver be arbitrarily different, and, if so, why?

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the linked Resize Observer specification section and compare its cross-document behavior with IntersectionObserver, as described in the issue. Done means resolving whether same-origin cross-document observation is allowed and documenting the decision or rationale in the specification.

Written by the indexing model from the issue text.

Assessment

Tech stack
css
Domain
frontend, web-dev
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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