diff --git a/baselines/dom.generated.d.ts b/baselines/dom.generated.d.ts
index d5d9a1510..221d59014 100644
--- a/baselines/dom.generated.d.ts
+++ b/baselines/dom.generated.d.ts
@@ -2780,11 +2780,14 @@ interface CSSStyleDeclaration {
     gridAutoRows: string;
     gridColumn: string;
     gridColumnEnd: string;
+    /** @deprecated This is a legacy alias of `columnGap`. */
     gridColumnGap: string;
     gridColumnStart: string;
+    /** @deprecated This is a legacy alias of `gap`. */
     gridGap: string;
     gridRow: string;
     gridRowEnd: string;
+    /** @deprecated This is a legacy alias of `rowGap`. */
     gridRowGap: string;
     gridRowStart: string;
     gridTemplate: string;
@@ -3023,15 +3026,15 @@ interface CSSStyleDeclaration {
     webkitBorderTopLeftRadius: string;
     /** @deprecated This is a legacy alias of `borderTopRightRadius`. */
     webkitBorderTopRightRadius: string;
-    /** @deprecated */
+    /** @deprecated This is a legacy alias of `boxAlign`. */
     webkitBoxAlign: string;
-    /** @deprecated */
+    /** @deprecated This is a legacy alias of `boxFlex`. */
     webkitBoxFlex: string;
-    /** @deprecated */
+    /** @deprecated This is a legacy alias of `boxOrdinalGroup`. */
     webkitBoxOrdinalGroup: string;
-    /** @deprecated */
+    /** @deprecated This is a legacy alias of `boxOrient`. */
     webkitBoxOrient: string;
-    /** @deprecated */
+    /** @deprecated This is a legacy alias of `boxPack`. */
     webkitBoxPack: string;
     /** @deprecated This is a legacy alias of `boxShadow`. */
     webkitBoxShadow: string;
diff --git a/package-lock.json b/package-lock.json
index da31ff677..e08c300ec 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -20,7 +20,7 @@
         "@webref/css": "^2.0.11",
         "@webref/elements": "^1.0.2",
         "@webref/idl": "^2.4.1",
-        "bcd-idl-mapper": "^1.3.0",
+        "bcd-idl-mapper": "^1.3.1",
         "cpx2": "^4.0.0",
         "danger": "^10.6.6",
         "eslint": "^7.32.0",
@@ -37,26 +37,25 @@
       }
     },
     "../bcd-idl-mapper": {
-      "version": "1.1.0",
+      "version": "1.3.1",
       "extraneous": true,
       "license": "ISC",
       "dependencies": {
         "webidl2": "^24.1.2"
       },
       "devDependencies": {
-        "@babel/core": "^7.14.8",
-        "@babel/eslint-parser": "^7.14.7",
+        "@babel/core": "^7.15.5",
+        "@babel/eslint-parser": "^7.15.4",
         "@babel/plugin-syntax-top-level-await": "^7.14.5",
-        "eslint": "^7.31.0",
+        "eslint": "^7.32.0",
         "eslint-config-prettier": "^8.3.0",
-        "eslint-plugin-prettier": "^3.4.0",
-        "expect": "^27.0.6",
-        "mocha": "^9.0.3"
+        "eslint-plugin-prettier": "^4.0.0",
+        "expect": "^27.1.0",
+        "mocha": "^9.1.1"
       },
       "peerDependencies": {
-        "@mdn/browser-compat-data": "^3.3.12",
-        "@webref/css": "^2.0.5",
-        "@webref/idl": "^2.2.9"
+        "@mdn/browser-compat-data": "^4.0.2",
+        "@webref/idl": "^2.3.0"
       }
     },
     "node_modules/@babel/code-frame": {
@@ -967,9 +966,9 @@
       }
     },
     "node_modules/bcd-idl-mapper": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/bcd-idl-mapper/-/bcd-idl-mapper-1.3.0.tgz",
-      "integrity": "sha512-3jr9FXfGi4aLw/jif5uWSPcGoBdg1euwOI2jNfHG7Jc0AZtIy9KXE9CJ/o4mGBaqXTSJqzgzVSF4F9vrSTyQSA==",
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/bcd-idl-mapper/-/bcd-idl-mapper-1.3.1.tgz",
+      "integrity": "sha512-wTxMOaYmdqxrEfmgjcUehXed5Hc8PuDqZvTXnXVJ6qvLN6pI8K3LIus722qF6Qr15Cf749Wku24hXHuP15a7Rw==",
       "dev": true,
       "dependencies": {
         "webidl2": "^24.1.2"
@@ -6661,9 +6660,9 @@
       }
     },
     "bcd-idl-mapper": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/bcd-idl-mapper/-/bcd-idl-mapper-1.3.0.tgz",
-      "integrity": "sha512-3jr9FXfGi4aLw/jif5uWSPcGoBdg1euwOI2jNfHG7Jc0AZtIy9KXE9CJ/o4mGBaqXTSJqzgzVSF4F9vrSTyQSA==",
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/bcd-idl-mapper/-/bcd-idl-mapper-1.3.1.tgz",
+      "integrity": "sha512-wTxMOaYmdqxrEfmgjcUehXed5Hc8PuDqZvTXnXVJ6qvLN6pI8K3LIus722qF6Qr15Cf749Wku24hXHuP15a7Rw==",
       "dev": true,
       "requires": {
         "webidl2": "^24.1.2"
diff --git a/src/build/bcd/keep-alive.ts b/src/build/bcd/keep-alive.ts
index ba2783ba2..a1618dd46 100644
--- a/src/build/bcd/keep-alive.ts
+++ b/src/build/bcd/keep-alive.ts
@@ -14,9 +14,6 @@ export const forceKeepAlive: Record<string, string[]> = {
     "floodColor",
     "floodOpacity",
     "fontSizeAdjust",
-    "gridColumnGap",
-    "gridGap",
-    "gridRowGap",
     "lightingColor",
     "marker",
     "markerEnd",