w3c / w3c/csswg-drafts

[css-images-3] interpolating cross-fade(A, B) with cross-fade(B, A)

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#2,852 5 comments 0 reactions 0 assignees View on GitHub

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Closed Accepted by CSSWG Resolution css-images-4
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Description

Currently we spec that the arguments to cross-fade() are interpolated independently. However, this doesn't handle the case of cross-fade(A, B) to cross-fade(B, A) very nicely: it ends up creating a tree of cross-fades where one isn't necessary.

This is particularly a concern when the cross-fades are triggered by transitions which are reversed partway.

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 CSS Images 3 interpolation rules for cross-fade(), focusing on transitions between cross-fade(A, B) and cross-fade(B, A). Review the issue discussion to determine the intended behavior for reversed transitions; the work is done when the specification avoids unnecessary nested cross-fades and clearly defines this interpolation case.

Written by the indexing model from the issue text.

Assessment

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

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