WICG / WICG/declarative-partial-updates

Paint holding

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Description

As discussed in the WebPerfWG call, I'm just noting down the thoughts for public discussion.

I asked how the spec would treat painting / paint holding (e.g. during a navigation).
@noamr mentioned that is out of the scope for now (as this is more a primitive, so not related to navigations). So it would e.g. need a user land JS implementation that holds the paint (via CSS display:none or something), or using View Transitions for individual elements/nodes.

An idea I had was using the <link rel="expect" blocking="render" href="#id"> tag — which if inserted could hold paint until #id is also patched in.

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First steps

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Research direction

No file, test, or implementation entry point is identified. Start by reviewing the referenced WebPerfWG discussion and determining whether paint holding belongs in this specification; the issue does not define acceptance criteria or what would constitute done.

Written by the indexing model from the issue text.

Assessment

Tech stack
css, html, javascript
Domain
frontend, web-dev
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
20/100

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