diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index ee7f4338a3a10..1cfe3e04ba68d 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -4288,6 +4288,7 @@ export interface SourceFileLike {
     lineMap?: readonly number[];
     /** @internal */
     getPositionOfLineAndCharacter?(line: number, character: number, allowEdits?: true): number;
+    languageVariant?: LanguageVariant;
 }
 
 /** @internal */
diff --git a/src/services/completions.ts b/src/services/completions.ts
index 6d0cbf7183ed3..188f45f29ac45 100644
--- a/src/services/completions.ts
+++ b/src/services/completions.ts
@@ -1595,7 +1595,7 @@ function getJsxClosingTagCompletion(location: Node | undefined, sourceFile: Sour
         switch (node.kind) {
             case SyntaxKind.JsxClosingElement:
                 return true;
-            case SyntaxKind.SlashToken:
+            case SyntaxKind.LessThanSlashToken:
             case SyntaxKind.GreaterThanToken:
             case SyntaxKind.Identifier:
             case SyntaxKind.PropertyAccessExpression:
@@ -3508,7 +3508,7 @@ function getCompletionData(
                         }
                         break;
 
-                    case SyntaxKind.SlashToken:
+                    case SyntaxKind.LessThanSlashToken:
                         if (currentToken.parent.kind === SyntaxKind.JsxSelfClosingElement) {
                             location = currentToken;
                         }
@@ -3518,7 +3518,7 @@ function getCompletionData(
 
             switch (parent.kind) {
                 case SyntaxKind.JsxClosingElement:
-                    if (contextToken.kind === SyntaxKind.SlashToken) {
+                    if (contextToken.kind === SyntaxKind.LessThanSlashToken) {
                         isStartingCloseTag = true;
                         location = contextToken;
                     }
@@ -5805,7 +5805,7 @@ function isValidTrigger(sourceFile: SourceFile, triggerCharacter: CompletionsTri
         case "/":
             return !!contextToken && (isStringLiteralLike(contextToken)
                 ? !!tryGetImportFromModuleSpecifier(contextToken)
-                : contextToken.kind === SyntaxKind.SlashToken && isJsxClosingElement(contextToken.parent));
+                : contextToken.kind === SyntaxKind.LessThanSlashToken && isJsxClosingElement(contextToken.parent));
         case " ":
             return !!contextToken && isImportKeyword(contextToken) && contextToken.parent.kind === SyntaxKind.SourceFile;
         default:
diff --git a/src/services/services.ts b/src/services/services.ts
index 0534598da21d7..0ca849394c29b 100644
--- a/src/services/services.ts
+++ b/src/services/services.ts
@@ -504,8 +504,9 @@ function createChildren(node: Node, sourceFile: SourceFileLike | undefined): rea
         });
         return children;
     }
-
+    const languageVariant = sourceFile?.languageVariant ?? LanguageVariant.Standard;
     scanner.setText((sourceFile || node.getSourceFile()).text);
+    scanner.setLanguageVariant(languageVariant);
     let pos = node.pos;
     const processNode = (child: Node) => {
         addSyntheticNodes(children, pos, child.pos, node);
@@ -526,6 +527,7 @@ function createChildren(node: Node, sourceFile: SourceFileLike | undefined): rea
     node.forEachChild(processNode, processNodes);
     addSyntheticNodes(children, pos, node.end, node);
     scanner.setText(undefined);
+    scanner.setLanguageVariant(LanguageVariant.Standard);
     return children;
 }
 
diff --git a/src/services/utilities.ts b/src/services/utilities.ts
index bec7d4b266d20..ceb56323ceeb6 100644
--- a/src/services/utilities.ts
+++ b/src/services/utilities.ts
@@ -1889,7 +1889,7 @@ export function isInsideJsxElementOrAttribute(sourceFile: SourceFile, position:
     }
 
     // <div>|</div>
-    if (token.kind === SyntaxKind.LessThanToken && token.parent.kind === SyntaxKind.JsxClosingElement) {
+    if (token.kind === SyntaxKind.LessThanSlashToken && token.parent.kind === SyntaxKind.JsxClosingElement) {
         return true;
     }
 
@@ -1934,6 +1934,7 @@ export function isInsideJsxElement(sourceFile: SourceFile, position: number): bo
                 || node.kind === SyntaxKind.CloseBraceToken
                 || node.kind === SyntaxKind.OpenBraceToken
                 || node.kind === SyntaxKind.SlashToken
+                || node.kind === SyntaxKind.LessThanSlashToken
             ) {
                 node = node.parent;
             }
diff --git a/tests/baselines/reference/api/typescript.d.ts b/tests/baselines/reference/api/typescript.d.ts
index 2c56042e22d0c..87942520f2ab0 100644
--- a/tests/baselines/reference/api/typescript.d.ts
+++ b/tests/baselines/reference/api/typescript.d.ts
@@ -5907,6 +5907,7 @@ declare namespace ts {
      */
     interface SourceFileLike {
         readonly text: string;
+        languageVariant?: LanguageVariant;
     }
     interface SourceFileLike {
         getLineAndCharacterOfPosition(pos: number): LineAndCharacter;
diff --git a/tests/cases/fourslash/syntacticClassificationsJsx1.ts b/tests/cases/fourslash/syntacticClassificationsJsx1.ts
index 8e6bfc6462ec1..40909ef7bddfd 100644
--- a/tests/cases/fourslash/syntacticClassificationsJsx1.ts
+++ b/tests/cases/fourslash/syntacticClassificationsJsx1.ts
@@ -18,7 +18,7 @@ verify.syntacticClassificationsAre(
             c.jsxText(`
     some jsx text
 `),
-        c.punctuation("<"), c.punctuation("/"), c.jsxCloseTagName("div"), c.punctuation(">"), c.punctuation(";"),
+        c.punctuation("</"), c.jsxCloseTagName("div"), c.punctuation(">"), c.punctuation(";"),
     c.keyword("let"), c.identifier("y"), c.operator("="),
         c.punctuation("<"), 
             c.jsxSelfClosingTagName("element"), 
@@ -26,8 +26,8 @@ verify.syntacticClassificationsAre(
            c.punctuation("/"), c.punctuation(">")
 ) 
 
-const c2 = classification("2020");
-verify.semanticClassificationsAre("2020",
-    c2.semanticToken("variable.declaration", "x"), 
-    c2.semanticToken("variable.declaration", "y"), 
+const c2 = classification("2020");
+verify.semanticClassificationsAre("2020",
+    c2.semanticToken("variable.declaration", "x"), 
+    c2.semanticToken("variable.declaration", "y"), 
 );
diff --git a/tests/cases/fourslash/syntacticClassificationsJsx2.ts b/tests/cases/fourslash/syntacticClassificationsJsx2.ts
index 6c244ef4b6598..d4aff5d1ed85a 100644
--- a/tests/cases/fourslash/syntacticClassificationsJsx2.ts
+++ b/tests/cases/fourslash/syntacticClassificationsJsx2.ts
@@ -18,7 +18,7 @@ verify.syntacticClassificationsAre(
             c.jsxText(`
     some jsx text
 `),
-        c.punctuation("<"), c.punctuation("/"), c.jsxCloseTagName("div.name"), c.punctuation(">"), c.punctuation(";"),
+        c.punctuation("</"), c.jsxCloseTagName("div.name"), c.punctuation(">"), c.punctuation(";"),
     c.keyword("let"), c.identifier("y"), c.operator("="),
         c.punctuation("<"), 
             c.jsxSelfClosingTagName("element.name"), 
@@ -26,8 +26,8 @@ verify.syntacticClassificationsAre(
            c.punctuation("/"), c.punctuation(">")
 ) 
 
-const c2 = classification("2020");
-verify.semanticClassificationsAre("2020",
-    c2.semanticToken("variable.declaration", "x"), 
-    c2.semanticToken("variable.declaration", "y"), 
+const c2 = classification("2020");
+verify.semanticClassificationsAre("2020",
+    c2.semanticToken("variable.declaration", "x"), 
+    c2.semanticToken("variable.declaration", "y"), 
 );