[w3ctag/design-reviews] Document Render-Blocking (Issue #886)

こんにちは TAG-さん!

I'm requesting a TAG review of Document Render-Blocking.

The Web is designed with a model for incremental rendering. When a Document is loading, the browser can render its intermediate states before fetching all the requisite sub-resources, executing all script or fetching/parsing the complete Document. While this is great to reduce the time for first paint, there is a tradeoff between showing a jarring flash of intermediate Document state (which could be unstyled or have more CLS) vs blocking rendering on high priority sub-resources within a reasonable timeout.

The [render-blocking](https://html.spec.whatwg.org/#render-blocking-mechanism) concept helps browsers in making this tradeoff. It lets authors specify the set of stylesheets and script elements which should block rendering. For example, a stylesheet with the rules necessary to ensure a stable layout. But authors can’t specify which nodes should be added to the DOM before first render. This proposal aims to fill this gap.

  - Explainer¹ (minimally containing user needs and example code): https://github.com/WICG/view-transitions/blob/main/document-render-blocking.md
  - User research: N/A
  - Security and Privacy self-review²: https://github.com/WICG/view-transitions/blob/main/security-privacy-questionnaire-document-render-blocking.md
  - GitHub repo (if you prefer feedback filed there): https://github.com/whatwg/html/issues/9332
  - Primary contacts (and their relationship to the specification):
      - Khushal Sagar (@khushalsagar), Google
      - Noam Rosenthal (@noamr), Google
      - Vladimir Levin (@vmpstr), Google
  - Organization/project driving the design: Google
  - External status/issue trackers for this feature (publicly visible, e.g. Chrome Status): https://chromestatus.com/feature/5113053598711808

Further details:

  - [X] I have reviewed the TAG's [Web Platform Design Principles](https://www.w3.org/TR/design-principles/)
  - The group where the incubation/design work on this is being done (or is intended to be done in the future): HTML
  - The group where standardization of this work is intended to be done ("unknown" if not known): HTML
  - Existing major pieces of multi-stakeholder review or discussion of this design: N/A
  - Major unresolved issues with or opposition to this design: N/A
  - This work is being funded by: N/A

You should also know that...

This feature is needed for cross-browser compliant implementation of cross-document View Transitions, reviewed at https://github.com/w3ctag/design-reviews/issues/851.

We'd prefer the TAG provide feedback as (please delete all but the desired option):

  💬 leave review feedback as a **comment in this issue** and @-notify @khushalsagar @noamr.

-- 
Reply to this email directly or view it on GitHub:
https://github.com/w3ctag/design-reviews/issues/886
You are receiving this because you are subscribed to this thread.

Message ID: <w3ctag/design-reviews/issues/886@github.com>