Intent to Implement and Ship: assignedElements on <slot>
Rakina Zata Amni
Contact emails
Spec
https://html.spec.whatwg.org/#dom-slot-assignedelements
Discussion & WPT:
Summary
Add assignedElements on <slot>, similar to assignedNodes(), but returning Element nodes only. The method returns elements that are assigned to a given slot.
Motivation
Sometimes web developers need to know how many elements are provided by the user (for example, in a custom element with a Shadow DOM creating a slideshow, they need to know how many slides are provided to be able to generate the same number of pagination items). The currently available method assignedNodes returns all nodes, including empty text nodes, not just element nodes, which are usually not useful for web developers.
Risks
Interoperability and Compatibility
Low. Chrome would be the first browser to support this feature.
Edge: In development (assigned) https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/15125746/
Firefox: In development (assigned) https://bugzilla.mozilla.org/show_bug.cgi?id=1425685
Safari: No signals https://bugs.webkit.org/show_bug.cgi?id=174313
Web developers: Positive in wanting this feature as seen on https://github.com/w3c/webcomponents/issues/602
Interoperability tests:
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?
https://github.com/w3c/web-platform-tests/pull/8636
Link to entry on the feature dashboard
https://www.chromestatus.com/feature/4555001598836736
Requesting approval to ship?
Yes
Notes
Chris Harrelson
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Daniel Bratell
LGTM1
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Yoav Weiss
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