Not yet stable

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

Example Comparisons
Browsers
Features

Summary

A count of the number of APIs are in Browser X but not in Browser Y.
Not in ChromeNot in Chrome Android
In Chrome 11
In Chrome Android 15

Unstable APIs

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

Raw Data

Quick Links:

CSS Data

API First Browser Date Days in Limbo Notes
css.at-rules.media.display-mode.fullscreen 📋Chrome12/1/20153877
Firefox: In Firefox's "Full Screen" user interface, browser tabs and other user interface appear but display-mode: fullscreen is true.Safari: In a Safari browser window, display-mode: fullscreen is never true, even when using the Fullscreen API. See mdn/browser-compat-data#18807 (comment).Safari on iOS: In the Safari app, display-mode: fullscreen is never true, even when using the Fullscreen API. See mdn/browser-compat-data#18807 (comment).Safari on iOS: In an installed web application with the display manifest member set to standalone, display-mode: fullscreen is true, even though the system status bar is visible. See bug 264218.WebView on iOS: In the Safari app, display-mode: fullscreen is never true, even when using the Fullscreen API. See mdn/browser-compat-data#18807 (comment).WebView on iOS: In an installed web application with the display manifest member set to standalone, display-mode: fullscreen is true, even though the system status bar is visible. See bug 264218.
css.at-rules.media.display-mode.picture-in-picture 📋Chrome3/19/2024846
css.at-rules.media.display-mode.window-controls-overlay 📋Chrome9/2/20221410
css.properties.content.alt_text.counters Chrome Android9/2/2025314
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.mix-blend-mode.svg_elements Chrome3/3/20154150

HTML Data

API First Browser Date Days in Limbo Notes
html.elements.hr.hr_in_select Chrome10/31/2023986
Chrome: Exposes the <hr> visually in the page only when the menu is expanded (arrowing within the collapsed menu does not show them).Chrome: Does not expose the <hr> in the accessibility tree.Edge: Exposes the <hr> visually in the page only when the menu is expanded (arrowing within the collapsed menu does not show them).Edge: Does not expose the <hr> in the accessibility tree.Firefox: Does not expose the <hr> in the accessibility tree.Opera: Exposes the <hr> visually in the page only when the menu is expanded (arrowing within the collapsed menu does not show them).Opera: Does not expose the <hr> in the accessibility tree.Safari: Does not expose the <hr> in the accessibility tree.Safari on iOS: Does not expose the <hr> in the accessibility tree.WebView on iOS: Does not expose the <hr> in the accessibility tree.
html.elements.iframe.allow.compute-pressure 📋Chrome5/14/2024790
html.elements.iframe.allow.document-domain 📋Chrome1/23/20183093
html.elements.iframe.allow.local-fonts 📋Chrome6/21/20221483
html.elements.iframe.sandbox.allow-pointer-lock 📋Chrome11/6/20124997
html.elements.input.capture 📋Chrome Android2/27/20134884
html.elements.meta.name.viewport 📋Chrome Android6/27/20125129
html.elements.meta.name.viewport.initial-scale 📋Chrome Android6/27/20125129
html.elements.meta.name.viewport.interactive-widget 📋Chrome Android11/29/20221322
html.elements.meta.name.viewport.interactive-widget.overlays-content 📋Chrome Android11/29/20221322
html.elements.meta.name.viewport.interactive-widget.resizes-content 📋Chrome Android11/29/20221322
html.elements.meta.name.viewport.interactive-widget.resizes-visual 📋Chrome Android11/29/20221322
html.elements.meta.name.viewport.maximum-scale 📋Chrome Android6/27/20125129
html.elements.meta.name.viewport.minimum-scale 📋Chrome Android6/27/20125129
html.elements.meta.name.viewport.user-scalable 📋Chrome Android6/27/20125129
html.elements.meta.name.viewport.viewport-fit 📋Chrome Android4/1/2025468
html.elements.meta.name.viewport.viewport-fit.auto 📋Chrome Android4/1/2025468
html.elements.meta.name.viewport.viewport-fit.cover 📋Chrome Android4/1/2025468
html.elements.meta.name.viewport.width 📋Chrome Android6/27/20125129
html.elements.select.hr_in_select Chrome10/31/2023986
Chrome: Exposes the <hr> visually in the page only when the menu is expanded (arrowing within the collapsed menu does not show them).Chrome: Does not expose the <hr> in the accessibility tree.Edge: Exposes the <hr> visually in the page only when the menu is expanded (arrowing within the collapsed menu does not show them).Edge: Does not expose the <hr> in the accessibility tree.Firefox: Does not expose the <hr> in the accessibility tree.Opera: Exposes the <hr> visually in the page only when the menu is expanded (arrowing within the collapsed menu does not show them).Opera: Does not expose the <hr> in the accessibility tree.Safari: Does not expose the <hr> in the accessibility tree.Safari on iOS: Does not expose the <hr> in the accessibility tree.WebView on iOS: Does not expose the <hr> in the accessibility tree.
html.elements.select.size 📋Chrome12/11/20086423