CSS features in BCD missing an MDN reference

This page lists CSS entries in BCD that are missing an MDN Web Docs reference page.

Information

The default filtering on this page lists CSS features with a high chance of being added to MDN Web Docs. If you want to fill the gaps, check if someone is working on it in the mdn/content GitHub repo. If there are no active pull requests for the feature, get in touch with us or open an issue with an intent to document it.

Here's a quick explanation of the terminology used:

Stable
A major browser supports this for at least 2 years, or it's supported in multiple major browser engines.
Standard
Formally defined in a specification.
Experimental
Only available behind configs / preferences in one browser.
Deprecated
Marked as not for use in modern websites / projects.

Also show
Depth
Showing 2 of 75 missing CSS entries
EntryStatusSupportBrowsers
speak property📗 Standard🏆 Stable
Browsers
chrome: ≤80
chrome_android: ≤80
edge: ≤80
oculus: ≤9.0
opera: ≤67
opera_android: ≤57
samsunginternet_android: ≤13.0
webview_android: ≤80
global_keywords data type📗 Standard🏆 Stable
Browsers
chrome: 1
chrome_android: 18
edge: 12
firefox: 1
firefox_android: 4
ie: 3
oculus: 5.0
opera: 3.5
opera_android: 10.1
safari: 1
safari_ios: 1
samsunginternet_android: 1.0
webview_android: 4.4
webview_ios: 1
Updated Oct 15, 2026, 1:35 PM UTC, BCD v 8.1.6. Built by @bsmth.