Intent to Ship: Unprefix -webkit-background-clip for "text" and make it an alias

[Daniil Sakhapov]

Contact emails

sakh...@chromium.org

Specification

https://drafts.csswg.org/css-backgrounds/#background-clip

Summary

It allows to use the unprefixed version for background-clip: text and makes -webkit-background-clip an alias for background-clip. Also, it drops support for non-suffixed keywords (content, padding and border) for better round-trip with alias.

Blink component

Blink>CSS

Risks

Interoperability and Compatibility

None

Gecko: Shipped/Shipping Firefox doesn't support keywords with no suffix for prefixed version

WebKit: Shipped/Shipping Safari supports keywords with no suffix (border, content, padding), but only for prefixed version

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?

wpt.fyi/css/css-backgrounds/background-clip/clip-text-dynamic-2.html

Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5125388091260928

This intent message was generated by Chrome Platform Status.

[Thomas Steiner]

Is there any interest in doing the same for -webkit-text-fill-color? The two get typically used in combination for gradient effects: https://github.com/tomayac/blogccasion/blob/6ee3722011661db7a0c95c4379d7905bd8e95404/css/main.css#L100-L113. (See any of the headings on https://blog.tomayac.com/ for an example.)

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[一丝]

I think the correct specification address would be https://drafts.csswg.org/css-backgrounds-4/#typedef-bg-clip

In css-backgrounds-4 also added `border` value, should we support it when removing the prefix? Maybe this needs to be discussed further by the CSSWG.

[Yoav Weiss]

LGTM1

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[Daniil Sakhapov]

Also forgot to mention: the highest use counter for unsuffixed keyword is 0.08 - and among those I've analyzed 80% of websites and all of them use suffixed *-box version, so it's safe to remove.

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[Daniel Bratell]

It allows to use the unprefixed version for background-clip: text and makes -webkit-background-clip an alias for background-clip. Also, it drops support for non-suffixed keywords (content, padding and border) for better round-trip with alias.

Can you clarify exactly what this means? I'm perfectly fine with lgtm-ing unprefixing and adding a (temporary?) alias for the old keyword, but if we start removing support for keywords we need to be more careful and I want to be sure I understand.

/Daniel

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[Daniil Sakhapov]

Sure, I'm saying that old -webkit-background-clip works with keywords: border, content, padding. The new one - background-clip works with border-box, content-box, padding-box.

So, per compat spec -webkit-background-clip should be alias to background-clip. But since the keywords are different, in order to handle round trip better (e.g. setting -webkit-background-clip to content would read back content-box, as it's an alias to background-clip), we want to drop support of old keywords without -box for -webkit-background-clip. To see how bad that would we've set up use counters. 

The biggest one is 0.08%. I've manually checked 80% of the websites reported by that use counter, but found that all of them use *-box keywords, and only one uses -webkit-background-clip: content.

So I think it's safe to remove support for old keywords.
Hope it's more clear now.

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[Mike Taylor]

LGTM2, can you also please request reviews for the other categories in chromestatus (and file any relevant issues in the compat spec, if needed)?

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[Daniel Bratell]

LGTM3

/Daniel

[Levai Ferencz]

Hi,

We have the same problem as described here:

https://bugs.chromium.org/p/chromium/issues/detail?id=1457567

When will be fixed this ?

Ferencz Levai

Creatopy

LGTM3

/Daniel

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