Accept lowercase inline HTML declarations

Author: notriddle

lib/common.js

@@ -26,7 +26,7 @@ var OPENTAG = "<" + TAGNAME + ATTRIBUTE + "*" + "\\s*/?>";
 var CLOSETAG = "</" + TAGNAME + "\\s*[>]";
 var HTMLCOMMENT = "<!-->|<!--->|<!--(?:[^-]|-[^-]|--[^>])*-->"
 var PROCESSINGINSTRUCTION = "[<][?][\\s\\S]*?[?][>]";
-var DECLARATION = "<![A-Z]+" + "[^>]*>";
+var DECLARATION = "<![A-Za-z]+" + "[^>]*>";
 var CDATA = "<!\\[CDATA\\[[\\s\\S]*?\\]\\]>";
 var HTMLTAG =
     "(?:" +

test/regression.txt

@@ -491,4 +491,14 @@ x <- 1
 ""third [test]
 .
 <p>&quot;&quot;third <a href="example">test</a></p>
-````````````````````````````````
+````````````````````````````````
+
+#283
+```````````````````````````````` example
+x<!x>
+
+x<!>
+.
+<p>x<!x></p>
+<p>x&lt;!&gt;</p>
+````````````````````````````````