Intent to Ship: CSS 'ic' Length Unit

Rune Lillesveen

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Aug 4, 2022, 3:13:36 PM8/4/22

to blink-dev

Contact emails

fut...@chromium.org, ko...@chromium.org

Explainer

None

Specification

https://www.w3.org/TR/css-values-4/#ic

Summary

Support for expressing CSS lengths relative to the used advance measure of the CJK water ideograph.

Motivation

Allow authors to size elements to fit a given number of fullwidth glyphs for CJK fonts.

Note: both Gecko and WebKit ship this unit and this feature is part of the Interop 2022 effort.

Blink component

Blink>CSS

TAG review

TAG review status

Not applicable

Risks

Interoperability and Compatibility

Gecko: Shipped/Shipping (https://caniuse.com/mdn-css_types_length_ic)

WebKit: Shipped/Shipping (https://caniuse.com/mdn-css_types_length_ic)

Web developers: No signals

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

The new ic unit should work out of the box.

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?

Flag name

#enable-experimental-web-platform-features

Requires code in //chrome?

False

Tracking bug

https://crbug.com/937101

Estimated milestones

DevTrial on desktop

106

DevTrial on Android

106

Anticipated spec changes

Open questions about a feature may be a source of future web compat or interop issues. Please list open issues (e.g. links to known github issues in the project for the feature specification) whose resolution may introduce web compat/interop risk (e.g., changing to naming or structure of the API in a non-backward-compatible way).

Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5193188445257728

This intent message was generated by Chrome Platform Status.

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Rune Lillesveen

slightlyoff via Chromestatus

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Aug 4, 2022, 6:08:11 PM8/4/22

to blin...@chromium.org

LGTM1

Yoav Weiss

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Aug 5, 2022, 1:47:42 AM8/5/22

to slightlyoff via Chromestatus, blink-dev

LGTM2

On Fri, Aug 5, 2022 at 12:08 AM slightlyoff via Chromestatus <admin+sl...@cr-status.appspotmail.com> wrote:

LGTM1

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Daniel Bratell

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Aug 5, 2022, 4:27:35 AM8/5/22

to Yoav Weiss, slightlyoff via Chromestatus, blink-dev

LGTM3

/Daniel

To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAL5BFfVkmQJafZAbGjKRihj7bbXF_cZvWTmZvS29YVWYW6ELGw%40mail.gmail.com.

Philip Jägenstedt

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Aug 5, 2022, 12:45:05 PM8/5/22

to Daniel Bratell, Yoav Weiss, slightlyoff via Chromestatus, blink-dev

LGTM🎉

To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/379f34fb-45df-354d-1ac4-b567043ecdb7%40gmail.com.

紫云飞

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Aug 6, 2022, 11:53:54 AM8/6/22

to blink-dev, Philip Jägenstedt, yoav...@chromium.org, slightlyoff via Chromestatus, blink-dev, Daniel Bratell

Please hold shipping (if necessary) until this spec issue resolved https://github.com/w3c/csswg-drafts/issues/7577

Rune Lillesveen

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Aug 9, 2022, 12:14:22 PM8/9/22

to 紫云飞, blink-dev, Philip Jägenstedt, yoav...@chromium.org, slightlyoff via Chromestatus, Daniel Bratell

Given this was rejected last time it was discussed in the csswg, it doesn't seem likely it will change this time?

To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/63142886-4785-4cb9-9629-a4902588c1c9n%40chromium.org.

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Rune Lillesveen

Philip Jägenstedt

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Aug 9, 2022, 2:47:21 PM8/9/22

to 紫云飞, blink-dev, yoav...@chromium.org, slightlyoff via Chromestatus, Daniel Bratell

Hi Yunfei,

The currently specified behavior has already shipped in Firefox and Safari. If this is going to change, it's important that all browsers make the change, so that we don't end up with non-interoperable behavior.

Do you know of any fonts where 水 and 永 have different widths? Also curious if you have a link to the discussion on Chinese social media that you mentioned.

Best regards,

Philip

On Sat, Aug 6, 2022 at 5:54 PM 紫云飞 <l4462...@gmail.com> wrote:

一丝

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Aug 9, 2022, 11:50:24 PM8/9/22

to blink-dev, Philip Jägenstedt, blink-dev, yoav...@chromium.org, slightlyoff via Chromestatus, Daniel Bratell, 紫云飞

Discussion on Chinese social media see: https://twitter.com/yisibl/status/1555391638876274688

I used Google Translate to make it easier to read.

Philip Jägenstedt

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Aug 11, 2022, 7:04:22 AM8/11/22

to 一丝, blink-dev, yoav...@chromium.org, slightlyoff via Chromestatus, Daniel Bratell, 紫云飞

Thank you for sharing!

Rune Lillesveen

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Aug 31, 2022, 7:33:08 AM8/31/22

to 紫云飞, blink-dev, Philip Jägenstedt, yoav...@chromium.org, slightlyoff via Chromestatus, Daniel Bratell

we support the spec change, but since it won't have any impact on implementation details we'll continue to ship in parallel with spec consideration

We support the spec change, but since it won't have any impact on implementation details we'll continue to ship in parallel with the spec consideration.