Add CSS language server

package-lock.json

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@@ -5523,6 +5535,12 @@
         "uuid": "^3.3.2"
       }
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@@ -6285,12 +6309,102 @@
         "replace-ext": "^1.0.0"
       }
     },
+    "vscode-css-languageservice": {
+      "version": "5.4.2",
+      "resolved": "https://registry.npmjs.org/vscode-css-languageservice/-/vscode-css-languageservice-5.4.2.tgz",
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+      "dev": true,
+      "requires": {
+        "vscode-languageserver-textdocument": "^1.0.4",
+        "vscode-languageserver-types": "^3.16.0",
+        "vscode-nls": "^5.0.0",
+        "vscode-uri": "^3.0.3"
+      }
+    },
+    "vscode-html-languageservice": {
+      "version": "4.2.5",
+      "resolved": "https://registry.npmjs.org/vscode-html-languageservice/-/vscode-html-languageservice-4.2.5.tgz",
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+      "dev": true,
+      "requires": {
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+        "vscode-languageserver-types": "^3.16.0",
+        "vscode-nls": "^5.0.0",
+        "vscode-uri": "^3.0.3"
+      }
+    },
+    "vscode-json-languageservice": {
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/vscode-json-languageservice/-/vscode-json-languageservice-4.2.1.tgz",
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+      "dev": true,
+      "requires": {
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+        "vscode-languageserver-textdocument": "^1.0.3",
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+        "vscode-nls": "^5.0.0",
+        "vscode-uri": "^3.0.3"
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     "vscode-jsonrpc": {
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+      "dev": true,
+      "requires": {
+        "core-js": "^3.20.1",
+        "jsonc-parser": "^3.0.0",
+        "regenerator-runtime": "^0.13.9",
+        "request-light": "^0.5.8",
+        "typescript": "^4.0.5",
+        "vscode-css-languageservice": "^5.4.2",
+        "vscode-html-languageservice": "^4.2.5",
+        "vscode-json-languageservice": "^4.2.1",
+        "vscode-languageserver": "^8.0.0-next.14",
+        "vscode-languageserver-textdocument": "^1.0.4",
+        "vscode-nls": "^5.0.1",
+        "vscode-uri": "^3.0.3"
+      },
+      "dependencies": {
+        "vscode-jsonrpc": {
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+          "dev": true
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+        "vscode-languageserver": {
+          "version": "8.0.1",
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+          "dev": true,
+          "requires": {
+            "vscode-languageserver-protocol": "3.17.1"
+          }
+        },
+        "vscode-languageserver-protocol": {
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+          }
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     "vscode-languageserver": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/vscode-languageserver/-/vscode-languageserver-7.0.0.tgz",
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+    "vscode-nls": {
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     "vscode-uri": {
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package.json

@@ -25,7 +25,8 @@
     "posthtml-favicons": "^1.3.0",
     "posthtml-include": "^1.7.4",
     "posthtml-markdownit": "^1.3.0",
-    "sass": "^1.52.3"
+    "sass": "^1.52.3",
+    "vscode-langservers-extracted": "^4.2.1"
   },
   "scripts": {
     "build": "parcel build --no-autoinstall src/index.html && rename '.html' '.html.hbs' dist/browser/*.html",