LGTM1.
Two other browsers already shipped this. No doubt to proceed this.

On Sat, Oct 8, 2022 at 4:15 AM Ian Kilpatrick <ikilpatr...@chromium.org>
wrote:

> Contact emailsikilpatr...@chromium.org
>
> ExplainerNone
>
> Specificationhttps://drafts.csswg.org/css-align-3/#baseline-rules
>
> Summary
>
> This feature allows developers to align items within either flex or grid
> layout by their last baseline, instead of their first. This is done via the
> following properties: align-items: last baseline; /* flex/grid container */
> justify-items: last baseline; /* grid container */ align-self: last
> baseline; /* flex/grid item */ justify-self: last baseline; /* grid item */
>
>
> Blink componentBlink>Layout
> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3ELayout>
>
> TAG reviewNone - I don't believe CSS Align 3 ever went through Tag
> Review. However I'm happy to file one and cc/ the specification editors.
>
> TAG review statusNot applicable
>
> Risks
>
>
> Interoperability and Compatibility
>
>
>
> *Gecko*: Shipped/Shipping (note - relatively basic support)
>
> *WebKit*: Shipped/Shipping "It's complicated". WebKit currently parses
> "align-items: last baseline" however doesn't support it currently in layout
> (for Stable versions of the browser).
> https://caniuse.com/?search=last%20baseline
> <https://caniuse.com/?search=last+baseline> This is currently changing
> however with recent commits by WebKit implementing the "last baseline"
> behaviour. E.g. https://bugs.webkit.org/show_bug.cgi?id=245792
>
> *Web developers*: No signals
>
> *Other signals*:
>
> Activation
>
> This feature will likely be difficult to use initially for web developers
> for a few reasons. Support and implementation status is patchy. While
> adding tests for this feature...
> https://wpt.fyi/results/css?label=master&label=experimental&aligned&view=subtest&q=flex-align-baseline%20or%20grid-align-baseline%20or%20grid-justify-baseline
> <https://wpt.fyi/results/css?label=master&label=experimental&aligned=&view=subtest&q=flex-align-baseline+or+grid-align-baseline+or+grid-justify-baseline>
> ...existing implementations typically only supported relatively simple
> cases well. This primarily was because various specifications which this
> feature interacts with didn't specify what the last baseline of various
> boxes should be. Additionally "@supports(align-items: last baseline)" will
> return true for many versions of browsers that don't have any (or partial)
> layout support for this feature. Web developers may rely on UA versions
> and/or javascript to check actual support.
>
>
> 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
>
> Basic CSS property debugging in DevTools.
>
>
> 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?label=master&label=experimental&aligned&view=subtest&q=flex-align-baseline%20or%20grid-align-baseline%20or%20grid-justify-baseline
> <https://wpt.fyi/results/css?label=master&label=experimental&aligned=&view=subtest&q=flex-align-baseline+or+grid-align-baseline+or+grid-justify-baseline>
>
> Flag name--enable-experimental-web-platform-features or
> --enable-blink-features=CSSLastBaseline
>
> Requires code in //chrome?False
>
> Tracking bughttps://bugs.chromium.org/p/chromium/issues/detail?id=885175
>
> Estimated milestones
>
> 108 or 109
>
> Anticipated spec changes
>
> We filed multiple issues related to this feature - primarily for all the
> different types of layout algorithms how to determine their last baseline
> was underspecified.
>
> Scroll container - https://github.com/w3c/csswg-drafts/issues/7660
>
> Flexbox - https://github.com/w3c/csswg-drafts/issues/7641
>
> Multicol - https://github.com/w3c/csswg-drafts/issues/7639
>
> Tables - https://github.com/w3c/csswg-drafts/issues/7655
>
> Fieldset - https://github.com/w3c/csswg-drafts/issues/7656
>
> (and more).
>
> All of these issues have been resolved, and added tests.
>
> Link to entry on the Chrome Platform Status
> https://chromestatus.com/feature/5093352798683136
>
> Links to previous Intent discussionsIntent to prototype:
> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAJL3UpT5eVmfB6e-adc8exG1ouse25C_0A_2tn3fEVTwh-SetQ%40mail.gmail.com
> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/cajl3upt5evmfb6e-adc8exg1ouse25c_0a_2tn3fevtwh-s...@mail.gmail.com>
>
>
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> .
>


-- 
TAMURA Kent
Software Engineer, Google

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