added commentary on selector perf and whitespace

Author: johnbender

js/jquery.mobile.core.js

@@ -1,4 +1,4 @@
-/* 
+/*
 * "core" - The base file for jQm
 */
 
@@ -152,19 +152,21 @@
 				}
 				e = e.parentNode;
 			}
-			
+
 			// Return the theme letter we found, if none, return the
 			// specified default.
 
 			return ltr || defaultTheme || "a";
 		}
 	});
 
-	// TODO the following $ and $.fn extensions can/probably should be moved into
-	// jquery.mobile.core.helpers
-
-	// Find the closest javascript page element to gather settings data
-	// TODO complex selector parsing will slow down page load times
+	// TODO the following $ and $.fn extensions can/probably should be moved into jquery.mobile.core.helpers
+	//
+	// Find the closest javascript page element to gather settings data jsperf test
+	// http://jsperf.com/single-complex-selector-vs-many-complex-selectors/edit
+	// possibly naive, but it shows that the parsing overhead for *just* the page selector vs
+	// the page and dialog selector is negligable. This could probably be speed up by
+	// doing a similar parent node traversal to the one found in the inherited theme code above
 	$.fn.closestPageData = function() {
 		return $(this)
 			.closest(':jqmData(role="page"), :jqmData(role="dialog")')