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-rw-r--r--testing/web-platform/tests/conformance-checkers/html/attributes/lang/extlang-bad-novalid.html9
1 files changed, 9 insertions, 0 deletions
diff --git a/testing/web-platform/tests/conformance-checkers/html/attributes/lang/extlang-bad-novalid.html b/testing/web-platform/tests/conformance-checkers/html/attributes/lang/extlang-bad-novalid.html
new file mode 100644
index 0000000000..7908f08c3f
--- /dev/null
+++ b/testing/web-platform/tests/conformance-checkers/html/attributes/lang/extlang-bad-novalid.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>must be a valid BCP 47 language tag, or the empty string</title>
+<meta charset=utf-8>
+</head>
+<body lang=bat-smg><!-- bad extlang -->
+</body>
+</html>