[w3ctag/design-reviews] imagesrcset and imagesizes attributes on link rel=preload (#329)

こんにちはTAG！

I'm requesting a TAG review of:

  - Name: imagesrcset and imagesizes attributes on link rel=preload
  - Specification URL: https://github.com/whatwg/html/pull/4048 and https://github.com/w3c/preload/pull/134

  - Explainer, Requirements Doc, or Example code: [Explainer](https://docs.google.com/document/d/1wob4u9AER1kmUodqIEp78BuziSJChBl54A5ZRXPRCUI/edit?usp=sharing)
  - Tests: https://github.com/web-platform-tests/wpt/pull/9595, https://github.com/web-platform-tests/wpt/pull/14231

  - Primary contacts: @irori, @domfarolino, @kinu

Further details (optional):

  - Relevant time constraints or deadlines: we plan to ship this in Chrome 73, which branches in late-Jan 2019 and ships in March.
  - [x] I have read and filled out the [Self-Review Questionnare on Security and Privacy](https://www.w3.org/TR/security-privacy-questionnaire/). The assessment is no difference from existing link rel=preload.
  - [x] I have reviewed the TAG's [API Design Principles](https://w3ctag.github.io/design-principles/)

You should also know that...

Two issues have been raised in the past discussions:

- `<picture>` use-case: It's not always easy or possible to create a set of `<link rel=preload>`s whose selection logic is equivalent to a `<picture>` element. This was discussed at TPAC 2018, and a summary is [here](https://github.com/w3c/preload/issues/131#issuecomment-433314755).

- Preloads that depend on viewport dimensions would need to be delayed until the end of the `<head>` tag, where the viewport is locked. (This is not an issue specific to imagesrcset/imagesizes, since preload can have `media` attribute.) That means most `imagesrcset`s cannot be preloaded just by preprocessing HTTP headers.  We plan to discuss the viewport issue separately from this one.

We'd prefer the TAG provide feedback as (please select one):

  - [ ] open issues in our Github repo for each point of feedback
  - [ ] open a single issue in our Github repo for the entire review
  - [x] leave review feedback as a comment in this issue

cc: @yoavweiss


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Received on Thursday, 29 November 2018 01:55:32 UTC