web-platform-tests / web-platform-tests/interop

Out of band loads triggering img.complete on lazy images

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focus-area-proposal
Dominant language
JavaScript
Stars
524
Forks
35
Avg merge
1d 4h
Merged PRs (30d)
10

Description

Description

Currently some implementations leak background loading of an image that's marked as lazy-loading. This can cause webcompat issues when sites assume that the unloaded instance of an image has correct metadata based on a background load.

Specification

https://html.spec.whatwg.org/#updating-the-image-data

web-feature

No response

Test Links

https://wpt.fyi/results/html/semantics/embedded-content/the-img-element/update-the-image-data/lazy-out-of-band-load.html?label=master&label=experimental&aligned&q=html%2Fsemantics%2Fembedded-content%2Fthe-img-element%2Fupdate-the-image-data%2Flazy-out-of-band-load.html

Additional Signals

Contributor guide

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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 HTML specification section and the WPT case lazy-out-of-band-load.html, then compare the reported behavior with the linked browser issues. Determine which web-platform test or Interop result needs attention; done means the lazy-image behavior matches the specification and the relevant test passes consistently.

Written by the indexing model from the issue text.

Assessment

Tech stack
javascript
Domain
testing-qa, web-dev
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Active
Clarity
Needs clarification
Newbie friendliness
45/100

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