1 files changed, 58 insertions, 0 deletions
diff --git a/src/css/defaultDisplay.js b/src/css/defaultDisplay.js
new file mode 100644
index 000000000..78acb2bcd
--- /dev/null
+++ b/src/css/defaultDisplay.js
@@ -0,0 +1,58 @@
+define([
+	"../core",
+	"../manipulation" // appendTo
+], function( jQuery ) {
+
+var iframe,
+	elemdisplay = { BODY: "block" };
+
+/**
+ * Retrieve the actual display of a element
+ * @param {String} name nodeName of the element
+ * @param {Object} doc Document object
+ */
+function actualDisplay( name, doc ) {
+	var elem = jQuery( doc.createElement( name ) ).appendTo( doc.body ),
+		display = jQuery.css( elem[0], "display" );
+	elem.remove();
+	return display;
+}
+
+/**
+ * Try to determine the default display value of an element
+ * @param {String} nodeName
+ */
+function defaultDisplay( nodeName ) {
+	var doc = document,
+		display = elemdisplay[ nodeName ];
+
+	if ( !display ) {
+		display = actualDisplay( nodeName, doc );
+
+		// If the simple way fails, read from inside an iframe
+		if ( display === "none" || !display ) {
+			// Use the already-created iframe if possible
+			iframe = ( iframe ||
+				jQuery("<iframe frameborder='0' width='0' height='0'/>")
+				.css( "cssText", "display:block !important" )
+			).appendTo( doc.documentElement );
+
+			// Always write a new HTML skeleton so Webkit and Firefox don't choke on reuse
+			doc = ( iframe[0].contentWindow || iframe[0].contentDocument ).document;
+			doc.write("<!doctype html><html><body>");
+			doc.close();
+
+			display = actualDisplay( nodeName, doc );
+			iframe.detach();
+		}
+
+		// Store the correct default display
+		elemdisplay[ nodeName ] = display;
+	}
+
+	return display;
+}
+
+return defaultDisplay;
+
+});