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 returns CSS features with a high likelihood to have pull requests accepted that add a corresponding docs page. 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.

You can switch Depth 3 to see more data, but it's not that useful. By default, two levels of the tree are exposed, meaning you will see css.property-name but not css.property-name.value. This is more practical as not every value for a CSS property will have a dedicated MDN page, for example.

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.

Showing 22 of 66 missing entries

EntryStatusSupportBrowsers
animation-trigger property📗 Standard🧪 Experimental
Browsers
chrome: 146
chrome_android: 146
edge: 146
webview_android: 146
border-shape property📗 Standard🧪 Experimental
Browsers
chrome: 147
chrome_android: 147
edge: 147
webview_android: 147
flow-tolerance property📗 Standard🧪 Experimental
Browsers
safari: 26.4
safari_ios: 26.4
webview_ios: 26.4
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
stroke-color property📗 Standard🧪 Experimental
Browsers
safari: 11.1
safari_ios: 11.3
webview_ios: 11.3
timeline-trigger property📗 Standard🧪 Experimental
Browsers
chrome: 146
chrome_android: 146
edge: 146
webview_android: 146
timeline-trigger-activation-range property📗 Standard🧪 Experimental
Browsers
chrome: 146
chrome_android: 146
edge: 146
webview_android: 146
timeline-trigger-activation-range-end property📗 Standard🧪 Experimental
Browsers
chrome: 146
chrome_android: 146
edge: 146
webview_android: 146
timeline-trigger-activation-range-start property📗 Standard🧪 Experimental
Browsers
chrome: 146
chrome_android: 146
edge: 146
webview_android: 146
timeline-trigger-active-range property📗 Standard🧪 Experimental
Browsers
chrome: 146
chrome_android: 146
edge: 146
webview_android: 146
timeline-trigger-active-range-end property📗 Standard🧪 Experimental
Browsers
chrome: 146
chrome_android: 146
edge: 146
webview_android: 146
timeline-trigger-active-range-start property📗 Standard🧪 Experimental
Browsers
chrome: 146
chrome_android: 146
edge: 146
webview_android: 146
timeline-trigger-name property📗 Standard🧪 Experimental
Browsers
chrome: 146
chrome_android: 146
edge: 146
webview_android: 146
timeline-trigger-source property📗 Standard🧪 Experimental
Browsers
chrome: 146
chrome_android: 146
edge: 146
webview_android: 146
trigger-scope property📗 Standard🧪 Experimental
Browsers
chrome: 146
chrome_android: 146
edge: 146
webview_android: 146
view-transition-group property📗 Standard🧪 Experimental
Browsers
chrome: 140
chrome_android: 140
edge: 140
oculus: 41.0
opera: 124
opera_android: 92
webview_android: 140
view-transition-scope property📗 Standard🧪 Experimental
Browsers
chrome: 147
chrome_android: 147
edge: 147
webview_android: 147
headingfunction selector📗 Standard🧪 Experimental
Browsers
firefox: preview
view-transition-group-children selector📗 Standard🧪 Experimental
Browsers
chrome: 140
chrome_android: 140
edge: 140
oculus: 41.0
opera: 124
opera_android: 92
webview_android: 140
xr-overlay selector📗 Standard🧪 Experimental
Browsers
chrome: 83
chrome_android: 83
edge: 83
oculus: 10.0
opera: 69
opera_android: 59
samsunginternet_android: 13.0
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
random data type📗 Standard🧪 Experimental
Browsers
safari: 26.2
safari_ios: 26.2
webview_ios: 26.2
Updated Mar 20, 2026, 9:49 PM, BCD v 7.3.8. Built by @bsmth.