diff --git a/svg/global_attributes.json b/svg/global_attributes.json
index 630f91458586a3..8b3966109ba3d1 100644
--- a/svg/global_attributes.json
+++ b/svg/global_attributes.json
@@ -43,12 +43,12 @@
           "spec_url": "https://svgwg.org/svg2-draft/struct.html#LangSpaceAttrs",
           "support": {
             "chrome": {
-              "version_added": null
+              "version_added": false
             },
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": null
+              "version_added": false
             },
             "firefox_android": "mirror",
             "ie": {
@@ -58,7 +58,7 @@
             "opera": "mirror",
             "opera_android": "mirror",
             "safari": {
-              "version_added": null
+              "version_added": false
             },
             "safari_ios": "mirror",
             "samsunginternet_android": "mirror",
@@ -760,12 +760,12 @@
           "spec_url": "https://www.w3.org/TR/SVG11/struct.html#RequiredFeaturesAttribute",
           "support": {
             "chrome": {
-              "version_added": null
+              "version_added": false
             },
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": null
+              "version_added": false
             },
             "firefox_android": "mirror",
             "ie": {
@@ -775,7 +775,7 @@
             "opera": "mirror",
             "opera_android": "mirror",
             "safari": {
-              "version_added": null
+              "version_added": false
             },
             "safari_ios": "mirror",
             "samsunginternet_android": "mirror",
@@ -794,12 +794,12 @@
           "spec_url": "https://svgwg.org/svg2-draft/struct.html#ConditionalProcessingSystemLanguageAttribute",
           "support": {
             "chrome": {
-              "version_added": null
+              "version_added": false
             },
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": null
+              "version_added": false
             },
             "firefox_android": "mirror",
             "ie": {
@@ -809,7 +809,7 @@
             "opera": "mirror",
             "opera_android": "mirror",
             "safari": {
-              "version_added": null
+              "version_added": false
             },
             "safari_ios": "mirror",
             "samsunginternet_android": "mirror",
@@ -902,12 +902,12 @@
           "spec_url": "https://drafts.fxtf.org/css-masking/#clip-property",
           "support": {
             "chrome": {
-              "version_added": null
+              "version_added": false
             },
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": null
+              "version_added": false
             },
             "firefox_android": "mirror",
             "ie": {
@@ -917,7 +917,7 @@
             "opera": "mirror",
             "opera_android": "mirror",
             "safari": {
-              "version_added": null
+              "version_added": false
             },
             "safari_ios": "mirror",
             "samsunginternet_android": "mirror",
@@ -1004,12 +1004,12 @@
           "spec_url": "https://svgwg.org/svg2-draft/painting.html#ColorProperty",
           "support": {
             "chrome": {
-              "version_added": null
+              "version_added": false
             },
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": null
+              "version_added": false
             },
             "firefox_android": "mirror",
             "ie": {
@@ -1019,7 +1019,7 @@
             "opera": "mirror",
             "opera_android": "mirror",
             "safari": {
-              "version_added": null
+              "version_added": false
             },
             "safari_ios": "mirror",
             "samsunginternet_android": "mirror",
@@ -1218,12 +1218,12 @@
           "spec_url": "https://drafts.csswg.org/css-ui/#cursor",
           "support": {
             "chrome": {
-              "version_added": null
+              "version_added": false
             },
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": null
+              "version_added": false
             },
             "firefox_android": "mirror",
             "ie": {
@@ -1233,7 +1233,7 @@
             "opera": "mirror",
             "opera_android": "mirror",
             "safari": {
-              "version_added": null
+              "version_added": false
             },
             "safari_ios": "mirror",
             "samsunginternet_android": "mirror",
@@ -1255,12 +1255,12 @@
           ],
           "support": {
             "chrome": {
-              "version_added": null
+              "version_added": false
             },
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": null
+              "version_added": false
             },
             "firefox_android": "mirror",
             "ie": {
@@ -1270,7 +1270,7 @@
             "opera": "mirror",
             "opera_android": "mirror",
             "safari": {
-              "version_added": null
+              "version_added": false
             },
             "safari_ios": "mirror",
             "samsunginternet_android": "mirror",
@@ -1289,12 +1289,12 @@
           "spec_url": "https://svgwg.org/svg2-draft/render.html#VisibilityControl",
           "support": {
             "chrome": {
-              "version_added": null
+              "version_added": false
             },
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": null
+              "version_added": false
             },
             "firefox_android": "mirror",
             "ie": {
@@ -1304,7 +1304,7 @@
             "opera": "mirror",
             "opera_android": "mirror",
             "safari": {
-              "version_added": null
+              "version_added": false
             },
             "safari_ios": "mirror",
             "samsunginternet_android": "mirror",
@@ -1397,7 +1397,7 @@
           ],
           "support": {
             "chrome": {
-              "version_added": null
+              "version_added": false
             },
             "chrome_android": "mirror",
             "edge": "mirror",
@@ -1412,7 +1412,7 @@
             "opera": "mirror",
             "opera_android": "mirror",
             "safari": {
-              "version_added": null
+              "version_added": false
             },
             "safari_ios": "mirror",
             "samsunginternet_android": "mirror",
@@ -1533,12 +1533,12 @@
           "spec_url": "https://drafts.fxtf.org/filter-effects/#FilterProperty",
           "support": {
             "chrome": {
-              "version_added": null
+              "version_added": false
             },
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": null
+              "version_added": false
             },
             "firefox_android": "mirror",
             "ie": {
@@ -1548,7 +1548,7 @@
             "opera": "mirror",
             "opera_android": "mirror",
             "safari": {
-              "version_added": null
+              "version_added": false
             },
             "safari_ios": "mirror",
             "samsunginternet_android": "mirror",
@@ -1980,12 +1980,12 @@
           "mdn_url": "https://developer.mozilla.org/docs/Web/SVG/Attribute/kerning",
           "support": {
             "chrome": {
-              "version_added": null
+              "version_added": false
             },
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": null
+              "version_added": false
             },
             "firefox_android": "mirror",
             "ie": {
@@ -1995,7 +1995,7 @@
             "opera": "mirror",
             "opera_android": "mirror",
             "safari": {
-              "version_added": null
+              "version_added": false
             },
             "safari_ios": "mirror",
             "samsunginternet_android": "mirror",
@@ -2194,12 +2194,12 @@
           "spec_url": "https://drafts.fxtf.org/css-masking/#the-mask",
           "support": {
             "chrome": {
-              "version_added": null
+              "version_added": false
             },
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": null
+              "version_added": false
             },
             "firefox_android": "mirror",
             "ie": {
@@ -2209,7 +2209,7 @@
             "opera": "mirror",
             "opera_android": "mirror",
             "safari": {
-              "version_added": null
+              "version_added": false
             },
             "safari_ios": "mirror",
             "samsunginternet_android": "mirror",
@@ -2231,12 +2231,12 @@
           ],
           "support": {
             "chrome": {
-              "version_added": null
+              "version_added": false
             },
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": null
+              "version_added": false
             },
             "firefox_android": "mirror",
             "ie": {
@@ -2246,7 +2246,7 @@
             "opera": "mirror",
             "opera_android": "mirror",
             "safari": {
-              "version_added": null
+              "version_added": false
             },
             "safari_ios": "mirror",
             "samsunginternet_android": "mirror",
@@ -2265,12 +2265,12 @@
           "spec_url": "https://svgwg.org/svg2-draft/render.html#OverflowAndClipProperties",
           "support": {
             "chrome": {
-              "version_added": null
+              "version_added": false
             },
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": null
+              "version_added": false
             },
             "firefox_android": "mirror",
             "ie": {
@@ -2280,7 +2280,7 @@
             "opera": "mirror",
             "opera_android": "mirror",
             "safari": {
-              "version_added": null
+              "version_added": false
             },
             "safari_ios": "mirror",
             "samsunginternet_android": "mirror",
@@ -2467,7 +2467,7 @@
           "spec_url": "https://svgwg.org/svg2-draft/painting.html#SpecifyingStrokePaint",
           "support": {
             "chrome": {
-              "version_added": null
+              "version_added": false
             },
             "chrome_android": "mirror",
             "edge": "mirror",
@@ -2482,7 +2482,7 @@
             "opera": "mirror",
             "opera_android": "mirror",
             "safari": {
-              "version_added": null
+              "version_added": false
             },
             "safari_ios": "mirror",
             "samsunginternet_android": "mirror",
@@ -2914,12 +2914,12 @@
           ],
           "support": {
             "chrome": {
-              "version_added": null
+              "version_added": false
             },
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": null
+              "version_added": false
             },
             "firefox_android": "mirror",
             "ie": {
@@ -2929,7 +2929,7 @@
             "opera": "mirror",
             "opera_android": "mirror",
             "safari": {
-              "version_added": null
+              "version_added": false
             },
             "safari_ios": "mirror",
             "samsunginternet_android": "mirror",
@@ -3057,12 +3057,12 @@
           "spec_url": "https://svgwg.org/svg2-draft/render.html#VisibilityControl",
           "support": {
             "chrome": {
-              "version_added": null
+              "version_added": false
             },
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": null
+              "version_added": false
             },
             "firefox_android": "mirror",
             "ie": {
@@ -3072,7 +3072,7 @@
             "opera": "mirror",
             "opera_android": "mirror",
             "safari": {
-              "version_added": null
+              "version_added": false
             },
             "safari_ios": "mirror",
             "samsunginternet_android": "mirror",