Removes 'subline' from test/index.html. Fixes #10371

test/index.html

@@ -55,7 +55,7 @@
 	<script>
 	// html5shiv, enabling HTML5 elements to be used with jQuery
 		( "abbr article aside audio canvas details figcaption figure footer header hgroup " +
-			"mark meter nav output progress section subline summary time video"
+			"mark meter nav output progress section summary time video"
 		).replace(/\w+/g, function(n) {
 			document.createElement(n);
 		});