diff --git a/extensions/html-language-features/client/src/autoInsertion.ts b/extensions/html-language-features/client/src/autoInsertion.ts
index e95e6a64a09db..3c70839befe4a 100644
--- a/extensions/html-language-features/client/src/autoInsertion.ts
+++ b/extensions/html-language-features/client/src/autoInsertion.ts
@@ -56,14 +56,20 @@ export function activateAutoInsertion(provider: (kind: 'autoQuote' | 'autoClose'
 		}
 
 		const lastChange = contentChanges[contentChanges.length - 1];
-		const lastCharacter = lastChange.text[lastChange.text.length - 1];
-		if (isEnabled['autoQuote'] && lastChange.rangeLength === 0 && lastCharacter === '=') {
-			doAutoInsert('autoQuote', document, lastChange);
-		} else if (isEnabled['autoClose'] && lastChange.rangeLength === 0 && (lastCharacter === '>' || lastCharacter === '/')) {
-			doAutoInsert('autoClose', document, lastChange);
+		if (lastChange.rangeLength === 0 && isSingleLine(lastChange.text)) {
+			const lastCharacter = lastChange.text[lastChange.text.length - 1];
+			if (isEnabled['autoQuote'] && lastCharacter === '=') {
+				doAutoInsert('autoQuote', document, lastChange);
+			} else if (isEnabled['autoClose'] && (lastCharacter === '>' || lastCharacter === '/')) {
+				doAutoInsert('autoClose', document, lastChange);
+			}
 		}
 	}
 
+	function isSingleLine(text: string): boolean {
+		return !/\n/.test(text);
+	}
+
 	function doAutoInsert(kind: 'autoQuote' | 'autoClose', document: TextDocument, lastChange: TextDocumentContentChangeEvent) {
 		const rangeStart = lastChange.range.start;
 		const version = document.version;