add HTML5 doctype to all tests

[dygraphs.git] / tests / underlay-callback.html
diff --git a/tests/underlay-callback.html b/tests/underlay-callback.html

index 762ed49..d077e2f 100644 (file)
--- a/tests/underlay-callback.html
+++ b/tests/underlay-callback.html
@@ -1,3 +1,4 @@
+<!DOCTYPE html>
  <html>
    <head>
      <title>Custom underlay callback</title>