HTTP features in BCD missing an MDN reference

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

Information

The default filtering on this page lists HTTP 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 12 of 25 missing HTTP entries
EntryStatusSupportBrowsers
css_files data: URL📗 Standard🏆 Stable
Browsers
chrome: ≤4
chrome_android: 18
edge: 12
firefox: ≤2
firefox_android: 4
ie: 8
oculus: 5.0
opera: 7.2
opera_android: 14
safari: ≤3.1
safari_ios: ≤2
samsunginternet_android: 1.0
webview_android: 4.4
webview_ios: ≤2
html_files data: URL📗 Standard🏆 Stable
Browsers
chrome: ≤4
chrome_android: 18
edge: 79
firefox: ≤2
firefox_android: 4
oculus: 5.0
opera: 15
opera_android: 14
safari: ≤3.1
safari_ios: ≤2
samsunginternet_android: 1.0
webview_android: 4.4
webview_ios: ≤2
js_files data: URL📗 Standard🏆 Stable
Browsers
chrome: ≤4
chrome_android: 18
edge: 12
firefox: ≤2
firefox_android: 4
ie: 9
oculus: 5.0
opera: 7.2
opera_android: 14
safari: ≤3.1
safari_ios: ≤2
samsunginternet_android: 1.0
webview_android: 4.4
webview_ios: ≤2
top_level_navigation_blocked data: URL📗 Standard🏆 Stable
Browsers
chrome: 60
chrome_android: 60
edge: 79
firefox: 59
firefox_android: 59
oculus: 5.0
opera: 47
opera_android: 44
safari: 14
safari_ios: 14
samsunginternet_android: 8.0
webview_ios: 14
allow_file_urls mixed content📗 Standard🏆 Stable
Browsers
chrome: ≤79
chrome_android: ≤79
edge: 79
firefox: 23
firefox_android: 23
oculus: ≤8.0
opera: ≤66
opera_android: ≤57
samsunginternet_android: ≤12.0
webview_android: ≤79
allow_localhost_url mixed content📗 Standard🏆 Stable
Browsers
chrome: ≤79
chrome_android: ≤79
edge: 79
firefox: 84
firefox_android: 84
oculus: ≤8.0
opera: ≤66
opera_android: ≤57
samsunginternet_android: ≤12.0
webview_android: ≤79
allow_loopback_url mixed content📗 Standard🏆 Stable
Browsers
chrome: ≤79
chrome_android: ≤79
edge: 79
firefox: 55
firefox_android: 55
oculus: ≤8.0
opera: ≤66
opera_android: ≤57
samsunginternet_android: ≤12.0
webview_android: ≤79
auto_upgrade_images mixed content📗 Standard🏆 Stable
Browsers
chrome: 86
chrome_android: 86
edge: 86
firefox: 127
firefox_android: 127
oculus: 12.0
opera: 72
opera_android: 61
samsunginternet_android: 14.0
webview_android: 86
auto_upgrade_video_audio mixed content📗 Standard🏆 Stable
Browsers
chrome: 80
chrome_android: 80
edge: 80
firefox: 127
firefox_android: 127
oculus: 9.0
opera: 67
opera_android: 57
samsunginternet_android: 13.0
webview_android: 80
block_mixed_downloads mixed content📗 Standard🏆 Stable
Browsers
chrome: 92
chrome_android: 92
edge: 92
firefox: 90
firefox_android: 90
oculus: 17.0
opera: 78
opera_android: 65
samsunginternet_android: 16.0
webview_android: 92
blockable_mixed_content mixed content📗 Standard🏆 Stable
Browsers
chrome: 79
chrome_android: 79
edge: 79
firefox: 23
firefox_android: 23
oculus: 8.0
opera: 66
opera_android: 57
safari: 9
safari_ios: 9
samsunginternet_android: 12.0
webview_android: 79
webview_ios: 9
private_network_access mixed content📗 Standard🏆 Stable
Browsers
chrome: 138
chrome_android: 138
edge: 138
oculus: 40.0
opera: 122
opera_android: 82
samsunginternet_android: 27.0
webview_android: 124
Updated Oct 15, 2026, 1:35 PM UTC, BCD v 8.1.6. Built by @bsmth.