Fix HTML export missing a bunch of Compound variables (#12774)

package.json

@@ -91,6 +91,7 @@
         "classnames": "^2.2.6",
         "commonmark": "^0.31.0",
         "counterpart": "^0.18.6",
+        "css-tree": "^2.3.1",
         "diff-dom": "^5.0.0",
         "diff-match-patch": "^1.0.5",
         "emojibase-regex": "15.3.2",
@@ -167,6 +168,7 @@
         "@types/commonmark": "^0.27.4",
         "@types/content-type": "^1.1.5",
         "@types/counterpart": "^0.18.1",
+        "@types/css-tree": "^2.3.8",
         "@types/diff-match-patch": "^1.0.32",
         "@types/escape-html": "^1.0.1",
         "@types/express": "^4.17.21",