Re: [blink-dev] Intent to Implement: Support step timing functions jump-start|end|both|none

[Stephen Mcgruer]

Ping, bcc blink-api-ow...@chromium.org for attention ;). Please note when reviewing that this is an I2I&S, see the first reply from kevers@

On Fri, 31 May 2019 at 13:41, kevers via blink-dev <blin...@chromium.org> wrote:

Safari tracking bug: https://bugs.webkit.org/show_bug.cgi?id=190406

WPT tests using jump-both or jump-none are failing on Safari 82 preview.

On Friday, May 31, 2019 at 11:59:20 AM UTC-4, Yoav Weiss wrote:

On Thu, May 30, 2019 at 8:25 PM Kevin Ellis <kev...@chromium.org> wrote:

Contact emails kev...@chromium.org Explainer https://danielcwilson.com/blog/2019/02/step-and-jump/ https://developer.mozilla.org/en-US/docs/Web/CSS/animation-timing-function Design docs/spec Specification: https://drafts.csswg.org/css-easing-1/#step-easing-functions TAG review

Has this been reviewed by the TAG? 

 

Summary The step timing functions jump-both, jump-none, jump-start and jump-end were introduced to the spec for easing functions in 2018. Two of these (jump-start and jump-end) are aliases for start and end, respective. The remaining 2 provide increased flexibility for step transitions by enabling step functions in which both or neither endpoint has a discontinuous step. Previously, one and only one of the two endpoints could have a step discontinuity. Motivation Provided support for a richer set of step animations. Firefox already has support for jump-* step timing functions. Adding support in Blink improves cross-browser interoperability. Risks

Interoperability and Compatibility The jump-* step timing functions are already supported in Firefox. Firefox: Shipped (https://wpt.fyi/results/css/css-easing/step-timing-functions-syntax.html) Edge: No public signals Safari: No public signals

Have we tried to gather signals from Safari folks?

 

Web developers: No signals

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? Yes Existing WPT tests for parsing, serialization and output of jump-* step timing functions. Link to entry on the Chrome Platform Status https://www.chromestatus.com/features/5730327525851136

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