Intent to Deprecate: CSSKeyframesRule.insertRule()

[Philip Jägenstedt]

Primary eng (and PM) emails

phi...@opera.com

Summary

Deprecate the CSSKeyframesRule.insertRule() in favor of the identical appendRule().

Motivation

The spec has only appendRule():

http://dev.w3.org/csswg/css-animations/#interface-csskeyframesrule

Compatibility Risk

IE11 implements only CSSKeyframesRule.appendRule(). Gecko has MozCSSKeyframesRule with only appendRule(). WebKit trunk has both CSSKeyframesRule.insertRule() and appendRule().

In other words, content that depends on insertRule() currently will not work in IE or Firefox.

Alternative implementation suggestion for web developers

Try to use CSSKeyframesRule.appendRule(), but fall back to insertRule() as stable Safari doesn't have appendRule() yet.

Usage information from UseCounter

https://www.chromestatus.com/metrics/feature/timeline/popularity/604

https://www.chromestatus.com/metrics/feature/timeline/popularity/605

insertRule() unfortunately has higher usage, but it only reaches 0.0002%.

Entry on chromestatus.com, crbug.com, or MDN

None.

Requesting approval to remove too?

No, let it be deprecated for at least one release cycle.

[PhistucK]

After the experience with the fonts.ready deprecation and transition to a property instead of a method, I believe one release cycle is not enough and the minimal number should be two, or event three.

Since this API is not costly at all to maintain, we can wait two releases before removing and developers could adapt. Bonus points for including the exact version and/or approximate time of stable removal within the message itself.

☆PhistucK

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[Philip Jägenstedt]

OK, two release cycles works for me, that's about 3 months on stable, and more time to react for people who use beta/dev/canary.

[Philip Jägenstedt]

As for including the version and/or time, can you suggest a specific wording? It's hard to predict several releases into the future and the version numbers aren't the same for all products that use Chromium/Blink, notably Opera.

[PhistucK]

Right, so versions do not work here. But starting dates (months) do.

So...

"CSSKeyframesRule.insertRule() was used, which is nonstandard, deprecated and will be removed in the first release after June, 2015. Be sure to update your code to use its standard variant, CSSKeyframesRule.appendRule() instead so it does not break."

☆PhistucK

[Chris Harrelson]

LGTM

[Jochen Eisinger]

LGTM2

[Dimitri Glazkov]

LGTM95.