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-rw-r--r--js/tests/visual/alert.html2
1 files changed, 1 insertions, 1 deletions
diff --git a/js/tests/visual/alert.html b/js/tests/visual/alert.html
index bb2d9cb48..9baee6f50 100644
--- a/js/tests/visual/alert.html
+++ b/js/tests/visual/alert.html
@@ -1,5 +1,5 @@
<!doctype html>
-<html>
+<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">