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diff --git a/src/lsp/util/css.ts b/src/lsp/util/css.ts
index 84b788889c876707b4201ba3d2093b8bb472dd2f..fc5f0a61056d9e9e355f40cc7dd97c78e8ed7dec 100644
--- a/src/lsp/util/css.ts
+++ b/src/lsp/util/css.ts
@@ -1,5 +1,5 @@
 import { TextDocument, Position } from 'vscode-languageserver'
-import { isInsideTag, isVueDoc, isSvelteDoc } from './html'
+import { isInsideTag, isVueDoc, isSvelteDoc, isHtmlDoc } from './html'
 import { State } from './state'
 
 export const CSS_LANGUAGES = [
@@ -28,7 +28,7 @@   if (isCssDoc(state, doc)) {
     return true
   }
 
-  if (isVueDoc(doc) || isSvelteDoc(doc)) {
+  if (isHtmlDoc(state, doc) || isVueDoc(doc) || isSvelteDoc(doc)) {
     let str = doc.getText({
       start: { line: 0, character: 0 },
       end: position,