diff --git a/extensions/html-language-features/server/src/test/completions.test.ts b/extensions/html-language-features/server/src/test/completions.test.ts
index 0371a2f74cd..aaf3cb5ec6b 100644
--- a/extensions/html-language-features/server/src/test/completions.test.ts
+++ b/extensions/html-language-features/server/src/test/completions.test.ts
@@ -23,24 +23,24 @@ export function assertCompletion(completions: CompletionList, expected: ItemDesc
 		return completion.label === expected.label;
 	});
 	if (expected.notAvailable) {
-		assert.equal(matches.length, 0, `${expected.label} should not existing is results`);
+		assert.strictEqual(matches.length, 0, `${expected.label} should not existing is results`);
 		return;
 	}
 
-	assert.equal(matches.length, 1, `${expected.label} should only existing once: Actual: ${completions.items.map(c => c.label).join(', ')}`);
+	assert.strictEqual(matches.length, 1, `${expected.label} should only existing once: Actual: ${completions.items.map(c => c.label).join(', ')}`);
 	let match = matches[0];
 	if (expected.documentation) {
-		assert.equal(match.documentation, expected.documentation);
+		assert.strictEqual(match.documentation, expected.documentation);
 	}
 	if (expected.kind) {
-		assert.equal(match.kind, expected.kind);
+		assert.strictEqual(match.kind, expected.kind);
 	}
 	if (expected.resultText && match.textEdit) {
 		const edit = TextEdit.is(match.textEdit) ? match.textEdit : TextEdit.replace(match.textEdit.replace, match.textEdit.newText);
-		assert.equal(TextDocument.applyEdits(document, [edit]), expected.resultText);
+		assert.strictEqual(TextDocument.applyEdits(document, [edit]), expected.resultText);
 	}
 	if (expected.command) {
-		assert.deepEqual(match.command, expected.command);
+		assert.deepStrictEqual(match.command, expected.command);
 	}
 }
 
@@ -65,7 +65,7 @@ export async function testCompletionFor(value: string, expected: { count?: numbe
 	let list = await mode.doComplete!(document, position, context);
 
 	if (expected.count) {
-		assert.equal(list.items.length, expected.count);
+		assert.strictEqual(list.items.length, expected.count);
 	}
 	if (expected.items) {
 		for (let item of expected.items) {
diff --git a/extensions/html-language-features/server/src/test/documentContext.test.ts b/extensions/html-language-features/server/src/test/documentContext.test.ts
index 612c0063c05..29ba6880972 100644
--- a/extensions/html-language-features/server/src/test/documentContext.test.ts
+++ b/extensions/html-language-features/server/src/test/documentContext.test.ts
@@ -12,9 +12,9 @@ suite('HTML Document Context', () => {
 		const rootFolders = [{ name: '', uri: 'file:///users/test/' }];
 
 		let context = getDocumentContext(docURI, rootFolders);
-		assert.equal(context.resolveReference('/', docURI), 'file:///users/test/');
-		assert.equal(context.resolveReference('/message.html', docURI), 'file:///users/test/message.html');
-		assert.equal(context.resolveReference('message.html', docURI), 'file:///users/test/folder/message.html');
-		assert.equal(context.resolveReference('message.html', 'file:///users/test/'), 'file:///users/test/message.html');
+		assert.strictEqual(context.resolveReference('/', docURI), 'file:///users/test/');
+		assert.strictEqual(context.resolveReference('/message.html', docURI), 'file:///users/test/message.html');
+		assert.strictEqual(context.resolveReference('message.html', docURI), 'file:///users/test/folder/message.html');
+		assert.strictEqual(context.resolveReference('message.html', 'file:///users/test/'), 'file:///users/test/message.html');
 	});
-});
\ No newline at end of file
+});
diff --git a/extensions/html-language-features/server/src/test/embedded.test.ts b/extensions/html-language-features/server/src/test/embedded.test.ts
index 525d5a59c11..005ecf0864c 100644
--- a/extensions/html-language-features/server/src/test/embedded.test.ts
+++ b/extensions/html-language-features/server/src/test/embedded.test.ts
@@ -23,7 +23,7 @@ suite('HTML Embedded Support', () => {
 		const docRegions = embeddedSupport.getDocumentRegions(htmlLanguageService, document);
 		const languageId = docRegions.getLanguageAtPosition(position);
 
-		assert.equal(languageId, expectedLanguageId);
+		assert.strictEqual(languageId, expectedLanguageId);
 	}
 
 	function assertEmbeddedLanguageContent(value: string, languageId: string, expectedContent: string): void {
@@ -31,7 +31,7 @@ suite('HTML Embedded Support', () => {
 
 		const docRegions = embeddedSupport.getDocumentRegions(htmlLanguageService, document);
 		const content = docRegions.getEmbeddedDocument(languageId);
-		assert.equal(content.getText(), expectedContent);
+		assert.strictEqual(content.getText(), expectedContent);
 	}
 
 	test('Styles', function (): any {
diff --git a/extensions/html-language-features/server/src/test/folding.test.ts b/extensions/html-language-features/server/src/test/folding.test.ts
index 693a74420f0..7bf90bb10d5 100644
--- a/extensions/html-language-features/server/src/test/folding.test.ts
+++ b/extensions/html-language-features/server/src/test/folding.test.ts
@@ -30,7 +30,7 @@ async function assertRanges(lines: string[], expected: ExpectedIndentRange[], me
 		actualRanges[i] = r(actual[i].startLine, actual[i].endLine, actual[i].kind);
 	}
 	actualRanges = actualRanges.sort((r1, r2) => r1.startLine - r2.startLine);
-	assert.deepEqual(actualRanges, expected, message);
+	assert.deepStrictEqual(actualRanges, expected, message);
 }
 
 function r(startLine: number, endLine: number, kind?: string): ExpectedIndentRange {
diff --git a/extensions/html-language-features/server/src/test/formatting.test.ts b/extensions/html-language-features/server/src/test/formatting.test.ts
index d7c922c736a..107001c7c00 100644
--- a/extensions/html-language-features/server/src/test/formatting.test.ts
+++ b/extensions/html-language-features/server/src/test/formatting.test.ts
@@ -41,7 +41,7 @@ suite('HTML Embedded Formatting', () => {
 		let result = await format(languageModes, document, range, formatOptions, undefined, { css: true, javascript: true });
 
 		let actual = TextDocument.applyEdits(document, result);
-		assert.equal(actual, expected, message);
+		assert.strictEqual(actual, expected, message);
 	}
 
 	async function assertFormatWithFixture(fixtureName: string, expectedPath: string, options?: any, formatOptions?: FormattingOptions): Promise<void> {
diff --git a/extensions/html-language-features/server/src/test/rename.test.ts b/extensions/html-language-features/server/src/test/rename.test.ts
index 2705b56fdf8..edebe68d7b2 100644
--- a/extensions/html-language-features/server/src/test/rename.test.ts
+++ b/extensions/html-language-features/server/src/test/rename.test.ts
@@ -34,7 +34,7 @@ async function testRename(value: string, newName: string, expectedDocContent: st
 		}
 
 		const newDocContent = TextDocument.applyEdits(document, edits);
-		assert.equal(newDocContent, expectedDocContent, `Expected: ${expectedDocContent}\nActual: ${newDocContent}`);
+		assert.strictEqual(newDocContent, expectedDocContent, `Expected: ${expectedDocContent}\nActual: ${newDocContent}`);
 	} else {
 		assert.fail('should have javascriptMode but no')
 	}
diff --git a/extensions/html-language-features/server/src/test/selectionRanges.test.ts b/extensions/html-language-features/server/src/test/selectionRanges.test.ts
index 9f9937bcaf7..c5166c7bb45 100644
--- a/extensions/html-language-features/server/src/test/selectionRanges.test.ts
+++ b/extensions/html-language-features/server/src/test/selectionRanges.test.ts
@@ -5,7 +5,7 @@
 
 import 'mocha';
 import * as assert from 'assert';
-import { getLanguageModes, ClientCapabilities, TextDocument, SelectionRange} from '../modes/languageModes';
+import { getLanguageModes, ClientCapabilities, TextDocument, SelectionRange } from '../modes/languageModes';
 import { getSelectionRanges } from '../modes/selectionRanges';
 import { getNodeFSRequestService } from '../node/nodeFs';
 
@@ -23,7 +23,7 @@ async function assertRanges(content: string, expected: (number | string)[][]): P
 
 	const document = TextDocument.create('test://foo.html', 'html', 1, content);
 	const actualRanges = await getSelectionRanges(languageModes, document, [document.positionAt(offset)]);
-	assert.equal(actualRanges.length, 1);
+	assert.strictEqual(actualRanges.length, 1);
 	const offsetPairs: [number, string][] = [];
 	let curr: SelectionRange | undefined = actualRanges[0];
 	while (curr) {
@@ -32,7 +32,7 @@ async function assertRanges(content: string, expected: (number | string)[][]): P
 	}
 
 	message += `${JSON.stringify(offsetPairs)}\n but should give:\n${JSON.stringify(expected)}\n`;
-	assert.deepEqual(offsetPairs, expected, message);
+	assert.deepStrictEqual(offsetPairs, expected, message);
 }
 
 suite('HTML SelectionRange', () => {
diff --git a/extensions/html-language-features/server/src/test/semanticTokens.test.ts b/extensions/html-language-features/server/src/test/semanticTokens.test.ts
index 548ce7d8458..3cf242df18f 100644
--- a/extensions/html-language-features/server/src/test/semanticTokens.test.ts
+++ b/extensions/html-language-features/server/src/test/semanticTokens.test.ts
@@ -40,7 +40,7 @@ async function assertTokens(lines: string[], expected: ExpectedToken[], ranges?:
 		lastLine = line;
 		lastCharacter = character;
 	}
-	assert.deepEqual(actualRanges, expected, message);
+	assert.deepStrictEqual(actualRanges, expected, message);
 }
 
 function t(startLine: number, character: number, length: number, tokenClassifiction: string): ExpectedToken {
diff --git a/extensions/html-language-features/server/src/test/words.test.ts b/extensions/html-language-features/server/src/test/words.test.ts
index e094bfb4251..f86ae969c66 100644
--- a/extensions/html-language-features/server/src/test/words.test.ts
+++ b/extensions/html-language-features/server/src/test/words.test.ts
@@ -16,7 +16,7 @@ suite('HTML Words', () => {
 		let actualRange = words.getWordAtText(value, offset, wordRegex);
 		assert(actualRange.start <= offset);
 		assert(actualRange.start + actualRange.length >= offset);
-		assert.equal(value.substr(actualRange.start, actualRange.length), expected);
+		assert.strictEqual(value.substr(actualRange.start, actualRange.length), expected);
 	}
 
 
@@ -41,4 +41,4 @@ suite('HTML Words', () => {
 		assertWord('console.log("hello");\n\r |var x1 = new F<A>(a, b);', 'var');
 	});
 
-});
\ No newline at end of file
+});