On Thu, Jun 15, 2023 at 7:49 AM 'Ethan Jimenez' via blink-dev <
blink-dev@chromium.org> wrote:

> Contact emails
>
> etha...@microsoft.com
>
>
> Explainer
>
> None
>

Well, a short search revealed this article
<https://ishadeed.com/article/learn-css-subgrid/> (by Ahmed Shadeed) as a
great explainer!


>
> Specification
>
> https://www.w3.org/TR/css-grid-2/#subgrids
>
>
> Design docs
>
>
>
>
> https://docs.google.com/document/d/1cpsCmzdDlXUKtMxOUKIoJFyLH54mLVhZnam_z0PriO0/edit?usp=sharing
>
>
> Summary
>
> Implements the CSS Grid Layout Module Level 2 specification, which
> introduces the concept of a "subgrid" to nested grid containers.
>
>
> Blink component
>
> Blink>CSS
> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3ECSS>
>
>
> Search tags
>
> subgrid <https://chromestatus.com/features#tags:subgrid>, css-grid-2
> <https://chromestatus.com/features#tags:css-grid-2>, css
> <https://chromestatus.com/features#tags:css>
>
>
> TAG review
>
> Review Request for CSS Subgrid · Issue #712 · w3ctag/design-reviews
> (github.com) <https://github.com/w3ctag/design-reviews/issues/712>
>
>
> TAG review status
>
> Issues addressed
>
>
> Risks
>
>
> Interoperability and Compatibility
>
> This is a well-defined specification from the W3C, so we would be
> addressing some interoperability gaps instead of causing them.
>
>
>
> *Gecko*: Shipped/Shipping
>
>
>
> *WebKit*: Shipped/Shipping
>
>
>
> *Web developers*: Strongly positive
>
>
>
> *Other signals*:
>
>
> WebView application risks
>
> *Does this intent deprecate or change behavior of existing APIs, such that
> it has potentially high risk for Android WebView-based applications?*
>
>
> Debuggability
>
> This feature is an extension of the capabilities of the CSS Grid Layout
> Module, no new properties will be introduced, but a new value "subgrid"
> will be introduced and properly rolled into the DevTools repository.
>
>
> Will this feature be supported on all six Blink platforms (Windows, Mac,
> Linux, Chrome OS, Android, and Android WebView)?
>
> Yes
>
>
> Is this feature fully tested by web-platform-tests
> <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
> ?
>
> Yes
>

https://wpt.fyi/results/css/css-grid/subgrid?label=experimental&label=master&aligned
has a few red spots. Are those being tracked somewhere? Any sense of their
impact on compatibility once we say we `@supports` subgrid?


>
> Flag name
>
> LayoutNGSubgrid
>
>
> Requires code in //chrome?
>
> False
>
>
> Tracking bug
>
> https://crbug.com/618969
>
>
> Estimated milestones
>
> The below estimates may adjust depending on when fragmentation support and
> the fixes for a couple of invalidation bugs are completed.
>
>
>
> Shipping on desktop
>
> 116
>
> DevTrial on desktop
>
> 114
>
>
>
> Shipping on Android
>
> 116
>
> DevTrial on Android
>
> 114
>
>
>
> Shipping on iOS
>
> 116
>
> DevTrial on iOS
>
> 114
>
>
> Anticipated spec changes
>
> The below issues require spec resolution. These ones have interop risk
> depending on the resulting resolutions, but there is currently no interop
> between browsers on these today. As a result, we don’t consider these to
> block shipping, but we do plan to continue to drive forward resolutions:
>
>    - [css-grid-1] Application of grid-positioning properties to static
>    position of grid children is inconsistent · Issue #7661 · w3c/csswg-drafts
>    (github.com) <https://github.com/w3c/csswg-drafts/issues/7661>
>    - [css-grid-2] Honoring the specified width/height of a subgrid ·
>    Issue #8966 · w3c/csswg-drafts (github.com)
>    <https://github.com/w3c/csswg-drafts/issues/8966>
>
>
>
> The below issues require spec clarification, but there is already
> consensus between implementations and should not block shipping or result
> in any future risk:
>
>    - [css-grid-2] Clamp out-of-range subgrid items before or after auto
>    placement? · Issue #8494 · w3c/csswg-drafts (github.com)
>    <https://github.com/w3c/csswg-drafts/issues/8494>
>    - [css-grid-2] How to properly accommodate margin/border/padding of a
>    subgrid with no item on the edges · Issue #7465 · w3c/csswg-drafts
>    (github.com) <https://github.com/w3c/csswg-drafts/issues/7465>
>
>
> Link to entry on the Chrome Platform Status
>
> https://chromestatus.com/feature/5663795354533888
>
>
> Links to previous Intent discussions
>
> Intent to prototype:
> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/MN2PR00MB06691936F5BB8575F43A9704BC569%40MN2PR00MB0669.namprd00.prod.outlook.com
>
>
>
> This intent message was generated by Chrome Platform Status
> <https://chromestatus.com/>.
>
>
>
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