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 SafariNot in Safari on iOS
In Safari 6
In Safari on iOS 4

Unstable APIs

Below is a list of features that are not in all of Safari and Safari on iOS

Raw Data

Quick Links:

HTML Data

API First Browser Date Days in Limbo Notes
html.elements.iframe.allow.display-capture 📋Safari9/19/20192509
html.elements.iframe.sandbox.allow-pointer-lock 📋Safari3/27/20173415
html.elements.input.capture 📋Safari on iOS9/13/20163610
html.elements.input.type_month 📋Safari on iOS3/29/20183048
Safari: The input type is recognized, but there is no month-specific control. See bug 200416.
html.elements.input.type_week 📋Safari on iOS12/11/2024599
html.elements.input.webkitdirectory Safari4/12/20183034
Chrome Android: In Chrome for Android 131, choosing a directory crashes the browser (see bug 376834374).Chrome Android: Before version 131, users cannot choose a directory, only individual files (see bug 40248532.Opera Android: In Chrome for Android 131, choosing a directory crashes the browser (see bug 376834374).Opera Android: Before version 87, users cannot choose a directory, only individual files (see bug 40248532.Safari on iOS: The attribute can be set but users cannot choose a directory, only individual files (see bug 271705).WebView Android: In Chrome for Android 131, choosing a directory crashes the browser (see bug 376834374).WebView Android: Before version 131, users cannot choose a directory, only individual files (see bug 40248532.WebView on iOS: The attribute can be set but users cannot choose a directory, only individual files (see bug 271705).
html.elements.link.rel.icon Safari3/18/20086711
Chrome: If both ICO and PNG are available, will use ICO over PNG if ICO has better matching sizes set. (Per caniuse.com.).Edge: In version 79 and later (Blink-based Edge), if both ICO and PNG are available, will use ICO over PNG if ICO has better matching sizes set. (Per caniuse.com.)Firefox: Before Firefox 83, the crossorigin attribute is not supported for rel="icon".Firefox: The media attribute is not supported for rel="icon", see bug 1603885.Opera: In version 15 and later (Blink-based Opera), if both ICO and PNG are available, will use ICO over PNG if ICO has better matching sizes set. (Per caniuse.com.)Safari: If both ICO and PNG are available, will ALWAYS use ICO file, regardless of sizes set. (Per caniuse.com.)Safari on iOS: Does not use favicons at all (but may have alternative for bookmarks, etc.). (Per caniuse.com.)WebView on iOS: Does not use favicons at all (but may have alternative for bookmarks, etc.). (Per caniuse.com.)
html.elements.select.size 📋Safari10/26/20076855
html.global_attributes.autocapitalize 📋Safari on iOS10/12/20115408
html.manifest.shortcuts 📋Safari3/5/2024880
Chrome: Supported on Windows only.Edge: Supported on Windows only.Opera: Supported on Windows only.