Intent to Implement and Ship: Frames timing function
Suzy Howlett
Contact emails
Spec
- CSS Timing Functions level 1 spec
- Subsection of spec dealing with frames timing functions
- TAG review requested
Summary
Bring Chromium’s timing function capabilities in line with the CSS Timing Functions spec by implementing the frames timing function.
For more details and background, see the implementation/design doc.
Motivation
The step timing function with position: middle, along with the shorthand step-middle, has been superseded by the frames timing function. See the W3C discussion from Mar 2016. The new CSS Timing Functions spec includes the frames timing function and not the step timing function with position: middle.
Chromium currently implements support for the step timing function, including position: middle, and does not support the frames timing function.
Interoperability and Compatibility Risk
Shipping this feature overall improves our position. In particular:
- Issue 5 of the Web Animations working draft says "step-middle and the middle keyword will likely be removed in favor of a frames() timing function.", and the editor's draft Time Transformations section has now been updated to point to the CSS Timing Functions spec, which includes frames and not step-middle.
- Firefox never shipped step-middle, in favour of frames. See Mozilla bug comment 27 and following, and the request to publish the FPWD of CSS Timing Functions.
Edge: No signals
Firefox: Shipped
Safari: No signals
Web developers: No signals, unless the W3C discussion about moving from step-middle to frames counts as positive signals for frames.
Ongoing technical constraints
None
Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?
Yes
OWP launch tracking bug
None
Feature request bug: crbug.com/646265
Link to entry on the feature dashboard
https://www.chromestatus.com/feature/5189363944128512
Requesting approval to ship?
Yes
TAMURA, Kent
Software Engineer, Google
Dimitri Glazkov
Chris Harrelson
LGTM2
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Alan Cutter
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