Add an exception to the a element since we use it as a block and in…

…line | Fixes metal#371

packages/metal-incremental-dom/src/html/HTMLParser.js

@@ -200,14 +200,15 @@ var HTMLParser = function(html, handler) {
 		tagName = tagName.toLowerCase();
 
 		if (block[tagName]) {
-			// Close last tag if it's inline, except if it's a "span" (since people
+			// Close last tag if it's inline, except if it's a "span" and "a" (since people
 			// usually add anything they want to spans, and browsers allow it).
-			// Note: this exception for "span" was added manually (i.e. it's not
+			// Note: this exception for "span" and "a" was added manually (i.e. it's not
 			// present in the original code).
 			while (
 				stack.last() &&
 				inline[stack.last()] &&
-				stack.last() !== 'span'
+				stack.last() !== 'span' &&
+				stack.last() !== 'a'
 			) {
 				parseEndTag('', stack.last());
 			}