Intent to Implement: Support step timing functions jump-start|end|both|none

[Kevin Ellis]

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 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 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

[kev...@google.com]

Title should have read "Intent to Implement and Ship: ...".  

[Yoav Weiss]

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

--
You received this message because you are subscribed to the Google Groups "blink-dev" group.
To unsubscribe from this group and stop receiving emails from it, send an email to blink-dev+...@chromium.org.
To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAE1FVET5UUOkbhfiNEQHCUi_zX8RoWz5_Sy238dppiTJRd2jSA%40mail.gmail.com.

[Stephen Mcgruer]

Has this been reviewed by the TAG? 

css-easing-1 was reviewed a long time ago when it was called css-timing-1 in https://github.com/w3ctag/design-reviews/issues/161. The only recommendation (the final status is unclear, the issue was closed without comment) was to rename the frames() timing function, which was done in https://github.com/w3c/csswg-drafts/issues/1680 and ultimately resulted in the introduction of the jump-* notation in https://github.com/w3c/csswg-drafts/commit/9bc2f6e4b8a641e297e2a1e920638f08cba7e415

To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CACj%3DBEhzeZLJTP8cOwFF1XjsEQv4%3De09Y%3D%3D19mz1Xbytd%2By3yQ%40mail.gmail.com.

[kev...@google.com]

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.

To unsubscribe from this group and stop receiving emails from it, send an email to blin...@chromium.org.

[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@

To unsubscribe from this group and stop receiving emails from it, send an email to blink-dev+...@chromium.org.
To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/f3ebe274-83ce-4ae2-85a5-4da56e756dd3%40chromium.org.

[Daniel Bratell]

LGTM1 for Intent to Implement & Ship.

I wonder what we can do to make the expectatins on the TAG part clearer so that we don't have to do this back-forth to clarify it so often.

/Daniel

You received this message because you are subscribed to the Google Groups "blink-api-owners-discuss" group.
To unsubscribe from this group and stop receiving emails from it, send an email to blink-api-owners-d...@chromium.org.
To post to this group, send email to blink-api-ow...@chromium.org.
To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-api-owners-discuss/CADY3MaeJQN3itNy1w_fMYJd1qE%2BmzfHsKt8X%2Bzkqqq9GQJTs-A%40mail.gmail.com.

--

/* Opera Software, Linköping, Sweden: CEST (UTC+2) */

[Yoav Weiss]

LGTM2 to ship

To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/op.z2w3qssjrbppqq%40cicero2.linkoping.osa.

[Chris Harrelson]

LGTM3

To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CACj%3DBEiyPrSLm2QkxZRLk0kQYcB1hucpzsQNYffEPNLcDx0EVQ%40mail.gmail.com.