Contact emails
keitha...@github.com, chrom...@keithcirkel.co.uk

Explainer
None


Specification
https://github.com/whatwg/html/issues/9733


Summary

It is useful for web authors do determine when their <dialog> elements open and 
close. popover already has `ToggleEvent` which is dispatched when a popover 
opens or closes, but <dialog> does not. The current way to detect when a 
<dialog> opens is to register a mutation observer to check for open, however, 
this is quite a lot of work where an event would be easier. This change 
incorporates the same `ToggleEvent`s that popovers dispatch, but for `<dialog>` 
elements: when `showModal` or `show` is called, <dialog> dispatches a 
ToggleEvent with newState=open. When a dialog is closed (via form or button or 
closewatcher) it should dispatch a ToggleEvent with newState=closed.



Blink component
Blink>DOM


TAG review
None


TAG review status
Not applicable


Risks




Interoperability and Compatibility

None


Gecko: Shipped/Shipping 
(https://github.com/mozilla/standards-positions/issues/1101)

WebKit: No signal

Web developers: No signals 
(https://github.com/WebKit/standards-positions/issues/418)

Other signals:


WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that it 
has potentially high risk for Android WebView-based applications?

None




Debuggability

None



Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, 
ChromeOS, Android, and Android WebView)?
No


Is this feature fully tested by web-platform-tests?
Yes


Flag name on chrome://flags
None


Finch feature name
None


Non-finch justification
None


Requires code in //chrome?
False


Tracking bug
https://bugs.chromium.org/p/chromium/issues/detail?id=1521813


Estimated milestones

No milestones specified



Anticipated spec changes

Open questions about a feature may be a source of future web compat or interop 
issues. Please list open issues (eg links to known github issues in the project 
for the feature specification) whose resolution may introduce web 
compat/interop risk (eg, changing to naming or structure of the API in a 
non-backward-compatible way).
None


Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5078613609938944?gate=5166222923268096


This intent message was generated by Chrome Platform Status.

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