Not yet stable

For a given set of browsers, what APIs are not yet in all of them.

Example Comparisons

Summary

A count of the number of APIs are in Browser X but not in Browser Y.
	Not in Chrome	Not in Edge
In Chrome		2
In Edge	1

Unstable APIs

Below is a list of features that are not in all of Chrome and Edge

Raw Data

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CSS

CSS Data

API	First Browser	Date	Days in Limbo	Notes
css.properties.content.alt_text.counters	Edge	9/5/2025	195	Chrome: Counters are recognised, but the spoken values do not incrementChrome Android: Counters are recognised, but the spoken values do not incrementEdge: Counters are recognised, but the spoken values do not incrementOpera: Counters are recognised, but the spoken values do not incrementOpera Android: Counters are recognised, but the spoken values do not incrementWebView Android: Counters are recognised, but the spoken values do not increment
css.properties.display.ruby	Chrome	1/23/2024	786
css.properties.display.ruby-text	Chrome	1/23/2024	786