Intent to Implement and Ship: ontransition{run, start, cancel} event handler attributes

[Stephen Mcgruer]

Contact emails smcg...@chromium.org Explainer N/A - spec has been stable for a long time Design docs/spec Specification: https://www.w3.org/TR/css-transitions-1/#event-handlers-on-elements-document-objects-and-window-objects TAG review N/A - spec has been stable for a long time Summary The ontransition{run, start, cancel} event handler attributes allow developers to add listeners for the respective events ('transitionrun', 'transitionstart', 'transitioncancel') on elements, Document objects, and Window objects. An example of how this might be used: target.ontransitioncancel = () => { console.log('transition was cancelled!'); } Motivation These features are part of the stable css-transitions-1 spec, and have shipped in other browsers a long time ago. Risks

Interoperability and Compatibility Low - Firefox and Safari already ship these (see https://output.jsbin.com/siyenag/quiet or WPT test results) Firefox: Shipped (https://wpt.fyi/results/css/css-transitions/idlharness.html?label=master&product=chrome%5Bexperimental%5D&product=safari%5Bstable%5D&product=firefox%5Bstable%5D&product=edge%5Bstable%5D&aligned)

Edge: No public signals. Edge has not yet shipped these attributes; I have not confirmed their public views but can do so if desired. Safari: Shipped (https://wpt.fyi/results/css/css-transitions/idlharness.html?label=master&product=chrome%5Bexperimental%5D&product=safari%5Bstable%5D&product=firefox%5Bstable%5D&product=edge%5Bstable%5D&aligned)

Web developers: No signals Ergonomics No known ergonomic risks - similar APIs already exist (ontransitionend) and we already fire these events for events registered with addEventListener. Activation No known activation risks. Security No known security risks.

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 https://wpt.fyi/results/css/css-transitions/idlharness.html?label=master&product=chrome%5Bexperimental%5D&product=safari%5Bstable%5D&product=firefox%5Bstable%5D&product=edge%5Bstable%5D&aligned Tracking bug https://crbug.com/868224 Link to entry on the Chrome Platform Status https://www.chromestatus.com/feature/5354694014664704

This intent message was generated by Chrome Platform Status.

[Robert Flack]

Non owner LGTM, IMO these should have been shipped at the same time as their corresponding transition events but we (I) missed this at the time.

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[Daniel Bratell]

LGTM1

/Daniel

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[Yoav Weiss]

LGTM2

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[Ojan Vafai]

LGTM3

Yoav Weiss wrote:

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