[html] add document symbols. Fixes #20956

extensions/html/server/npm-shrinkwrap.json

@@ -8,9 +8,9 @@
       "resolved": "https://registry.npmjs.org/vscode-css-languageservice/-/vscode-css-languageservice-2.0.0.tgz"
     },
     "vscode-html-languageservice": {
-      "version": "2.0.0",
+      "version": "2.0.1",
       "from": "vscode-html-languageservice@next",
-      "resolved": "https://registry.npmjs.org/vscode-html-languageservice/-/vscode-html-languageservice-2.0.0.tgz"
+      "resolved": "https://registry.npmjs.org/vscode-html-languageservice/-/vscode-html-languageservice-2.0.1.tgz"
     },
     "vscode-jsonrpc": {
       "version": "3.1.0-alpha.1",

extensions/html/server/package.json

@@ -9,7 +9,7 @@
   },
   "dependencies": {
     "vscode-css-languageservice": "^2.0.0",
-    "vscode-html-languageservice": "^2.0.0",
+    "vscode-html-languageservice": "^2.0.1",
     "vscode-languageserver": "^3.1.0-alpha.1",
     "vscode-nls": "^2.0.2",
     "vscode-uri": "^1.0.0"

extensions/html/server/src/modes/htmlMode.ts

@@ -32,6 +32,9 @@ export function getHTMLMode(htmlLanguageService: HTMLLanguageService): LanguageM
 		findDocumentLinks(document: TextDocument, documentContext: DocumentContext) {
 			return htmlLanguageService.findDocumentLinks(document, documentContext);
 		},
+		findDocumentSymbols(document: TextDocument) {
+			return htmlLanguageService.findDocumentSymbols(document, htmlDocuments.get(document));
+		},
 		format(document: TextDocument, range: Range, formatParams: FormattingOptions) {
 			let formatSettings = settings && settings.format;
 			if (!formatSettings) {