diff --git a/svg/attributes/conditional_processing.json b/svg/attributes/conditional_processing.json
index de98744f8f141..7fb059c55868f 100644
--- a/svg/attributes/conditional_processing.json
+++ b/svg/attributes/conditional_processing.json
@@ -7,12 +7,12 @@
             "mdn_url": "https://developer.mozilla.org/docs/Web/SVG/Attribute/requiredExtensions",
             "support": {
               "chrome": {
-                "version_added": null
+                "version_added": "81"
               },
               "chrome_android": "mirror",
               "edge": "mirror",
               "firefox": {
-                "version_added": null
+                "version_added": "2"
               },
               "firefox_android": "mirror",
               "ie": {
@@ -22,7 +22,7 @@
               "opera": "mirror",
               "opera_android": "mirror",
               "safari": {
-                "version_added": null
+                "version_added": "8"
               },
               "safari_ios": "mirror",
               "samsunginternet_android": "mirror",
@@ -33,6 +33,47 @@
               "standard_track": true,
               "deprecated": false
             }
+          },
+          "mathml": {
+            "__compat": {
+              "description": "Recognizes MathML namespace",
+              "support": {
+                "chrome": {
+                  "version_added": "81",
+                  "impl_url": "https://crrev.com/c/2007454",
+                  "flags": [
+                    {
+                      "type": "preference",
+                      "name": "#enable-experimental-web-platform-features",
+                      "value_to_set": "Enabled"
+                    }
+                  ]
+                },
+                "chrome_android": "mirror",
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "2"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": null
+                },
+                "oculus": "mirror",
+                "opera": "mirror",
+                "opera_android": "mirror",
+                "safari": {
+                  "version_added": "8"
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": "mirror",
+                "webview_android": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
           }
         },
         "requiredFeatures": {