WebAssembly features in BCD missing an MDN reference

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

Information

The default filtering on this page lists WebAssembly 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 24 of 26 missing WebAssembly entries
EntryStatusSupportBrowsers
BigInt-to-i64-integration feature📗 Standard🏆 Stable
Browsers
chrome: 85
chrome_android: 85
edge: 85
firefox: 78
firefox_android: 79
oculus: 12.0
opera: 71
opera_android: 60
safari: 14.1
safari_ios: 14.5
samsunginternet_android: 14.0
webview_android: 85
webview_ios: 14.5
WebAssembly.JSTag_static JavaScript API📗 Standard🏆 Stable
Browsers
bun: 1.2.3
chrome: 115
chrome_android: 115
edge: 115
firefox: 131
firefox_android: 131
nodejs: 21.0.0
oculus: 31.2
opera: 101
opera_android: 77
safari: 18.4
safari_ios: 18.4
samsunginternet_android: 23.0
webview_android: 115
webview_ios: 18.4
branch-hinting feature📗 Standard🏆 Stable
Browsers
chrome: 137
chrome_android: 137
edge: 137
firefox: 148
firefox_android: 148
oculus: 40.0
opera: 121
opera_android: 90
safari: 16
safari_ios: 16
samsunginternet_android: 30.0
webview_android: 137
webview_ios: 16
bulk-memory-operations feature📗 Standard🏆 Stable
Browsers
chrome: 75
chrome_android: 75
edge: 79
firefox: 79
firefox_android: 79
oculus: 7.0
opera: 62
opera_android: 54
safari: 15.1
safari_ios: 15.1
samsunginternet_android: 11.0
webview_android: 75
webview_ios: 15.1
exception-handling feature📗 Standard🏆 Stable
Browsers
chrome: 95
chrome_android: 95
edge: 95
firefox: 100
firefox_android: 100
oculus: 18.0
opera: 81
opera_android: 67
safari: 15.2
safari_ios: 15.2
samsunginternet_android: 17.0
webview_android: 95
webview_ios: 15.2
exceptionsFinal feature📗 Standard🏆 Stable
Browsers
chrome: 137
chrome_android: 137
edge: 137
firefox: 131
firefox_android: 131
oculus: 40.0
opera: 121
opera_android: 90
safari: 18.4
safari_ios: 18.4
samsunginternet_android: 30.0
webview_android: 137
webview_ios: 18.4
extended-constant-expressions feature📗 Standard🏆 Stable
Browsers
chrome: 114
chrome_android: 114
edge: 114
firefox: 112
firefox_android: 112
oculus: 31.2
opera: 100
opera_android: 76
safari: 17.4
safari_ios: 17.4
samsunginternet_android: 23.0
webview_android: 114
webview_ios: 17.4
fixed-width-SIMD feature📗 Standard🏆 Stable
Browsers
chrome: 91
chrome_android: 91
edge: 91
firefox: 89
firefox_android: 89
oculus: 16.0
opera: 77
opera_android: 64
safari: 16.4
safari_ios: 16.4
samsunginternet_android: 16.0
webview_android: 91
webview_ios: 16.4
garbage-collection feature📗 Standard🏆 Stable
Browsers
chrome: 119
chrome_android: 119
edge: 119
firefox: 120
firefox_android: 120
oculus: 31.2
opera: 105
opera_android: 79
safari: 18.2
safari_ios: 18.2
samsunginternet_android: 25.0
webview_android: 119
webview_ios: 18.2
trunc_sat_f32_s instruction📗 Standard🏆 Stable
Browsers
chrome: 75
chrome_android: 75
edge: 18
firefox: 64
firefox_android: 64
oculus: 7.0
opera: 62
opera_android: 54
safari: 15.1
safari_ios: 15.1
samsunginternet_android: 11.0
webview_android: 75
webview_ios: 15.1
trunc_sat_f32_u instruction📗 Standard🏆 Stable
Browsers
chrome: 75
chrome_android: 75
edge: 18
firefox: 64
firefox_android: 64
oculus: 7.0
opera: 62
opera_android: 54
safari: 15.1
safari_ios: 15.1
samsunginternet_android: 11.0
webview_android: 75
webview_ios: 15.1
trunc_sat_f64_s instruction📗 Standard🏆 Stable
Browsers
chrome: 75
chrome_android: 75
edge: 18
firefox: 64
firefox_android: 64
oculus: 7.0
opera: 62
opera_android: 54
safari: 15.1
safari_ios: 15.1
samsunginternet_android: 11.0
webview_android: 75
webview_ios: 15.1
trunc_sat_f64_u instruction📗 Standard🏆 Stable
Browsers
chrome: 75
chrome_android: 75
edge: 18
firefox: 64
firefox_android: 64
oculus: 7.0
opera: 62
opera_android: 54
safari: 15.1
safari_ios: 15.1
samsunginternet_android: 11.0
webview_android: 75
webview_ios: 15.1
jsStringBuiltins feature📗 Standard🏆 Stable
Browsers
chrome: 130
chrome_android: 130
edge: 130
firefox: 134
firefox_android: 134
oculus: 36
opera: 115
opera_android: 86
safari: 26.2
safari_ios: 26.2
samsunginternet_android: 28.0
webview_android: 130
webview_ios: 26.2
jspi feature📗 Standard🏆 Stable
Browsers
chrome: 137
chrome_android: 137
edge: 137
firefox: 153
firefox_android: 153
oculus: 40.0
opera: 121
opera_android: 90
safari: 27
safari_ios: 27
samsunginternet_android: 30.0
webview_android: 137
webview_ios: 27
memory64 feature📗 Standard🏆 Stable
Browsers
chrome: 133
chrome_android: 133
edge: 133
firefox: 134
firefox_android: 134
nodejs: 24.0.0
oculus: 38.1
opera: 118
opera_android: 88
safari: preview
samsunginternet_android: 29.0
webview_android: 133
multi-value feature📗 Standard🏆 Stable
Browsers
chrome: 86
chrome_android: 86
edge: 86
firefox: 78
firefox_android: 79
oculus: 12.0
opera: 72
opera_android: 61
safari: 13.1
safari_ios: 13.4
samsunginternet_android: 14.0
webview_android: 86
webview_ios: 13.4
non-trapping-float-to-int-conversions feature📗 Standard🏆 Stable
Browsers
chrome: 75
chrome_android: 75
edge: 18
firefox: 64
firefox_android: 64
oculus: 7.0
opera: 62
opera_android: 54
safari: 15.1
safari_ios: 15.1
samsunginternet_android: 11.0
webview_android: 75
webview_ios: 15.1
reference-types feature📗 Standard🏆 Stable
Browsers
chrome: 96
chrome_android: 96
edge: 96
firefox: 79
firefox_android: 79
oculus: 19.0
opera: 82
opera_android: 67
safari: 15.1
safari_ios: 15.1
samsunginternet_android: 17.0
webview_android: 96
webview_ios: 15.1
relaxed-SIMD feature📗 Standard🏆 Stable
Browsers
chrome: 114
chrome_android: 114
edge: 114
firefox: 146
firefox_android: 146
oculus: 31.2
opera: 100
opera_android: 76
safari: preview
samsunginternet_android: 23.0
webview_android: 114
sign-extension-operations feature📗 Standard🏆 Stable
Browsers
chrome: 69
chrome_android: 69
edge: 18
firefox: 62
firefox_android: 62
oculus: 6.0
opera: 56
opera_android: 48
safari: 14.1
safari_ios: 14.5
samsunginternet_android: 10.0
webview_android: 69
webview_ios: 14.5
tail-calls feature📗 Standard🏆 Stable
Browsers
chrome: 112
chrome_android: 112
edge: 112
firefox: 121
firefox_android: 121
oculus: 31.2
opera: 98
opera_android: 75
safari: 18.2
safari_ios: 18.2
samsunginternet_android: 23.0
webview_android: 112
webview_ios: 18.2
threads-and-atomics feature📗 Standard🏆 Stable
Browsers
chrome: 74
chrome_android: 88
edge: 79
firefox: 79
firefox_android: 79
oculus: 14.0
opera: 62
opera_android: 63
safari: 15.2
safari_ios: 15.2
samsunginternet_android: 15.0
webview_ios: 15.2
typedFunctionReferences feature📗 Standard🏆 Stable
Browsers
chrome: 119
chrome_android: 119
edge: 119
firefox: 120
firefox_android: 120
oculus: 31.2
opera: 105
opera_android: 79
safari: 18
safari_ios: 18
samsunginternet_android: 25.0
webview_android: 119
webview_ios: 18
Updated Oct 15, 2026, 1:35 PM UTC, BCD v 8.1.6. Built by @bsmth.