JavaScript features in BCD missing an MDN reference

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

Information

The default filtering on this page lists JavaScript 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.

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Depth
Showing 2 of 3 missing JavaScript entries
EntryStatusSupportBrowsers
block_level_functions function feature📗 Standard🏆 Stable
Browsers
bun: 1.0.0
chrome: 49
chrome_android: 49
deno: 1.0
edge: 12
firefox: 46
firefox_android: 46
ie: 11
nodejs: 4.0.0
oculus: 5.0
opera: 36
opera_android: 36
safari: 10
safari_ios: 10
samsunginternet_android: 5.0
webview_android: 49
webview_ios: 10
shorthand_object_literals grammar📗 Standard🏆 Stable
Browsers
bun: 1.0.0
chrome: 43
chrome_android: 43
deno: 1.0
edge: 12
firefox: 33
firefox_android: 33
nodejs: 4.0.0
oculus: 5.0
opera: 30
opera_android: 30
safari: 9
safari_ios: 9
samsunginternet_android: 4.0
webview_android: 43
webview_ios: 9
Updated Oct 15, 2026, 1:35 PM UTC, BCD v 8.1.6. Built by @bsmth.