Minor syntactical changes to :visible and :hidden.

src/css.js

@@ -200,18 +200,18 @@ jQuery.extend({
 });
 
 if ( jQuery.expr && jQuery.expr.filters ) {
-	jQuery.expr.filters.hidden = function(elem){
+	jQuery.expr.filters.hidden = function( elem ) {
 		var width = elem.offsetWidth, height = elem.offsetHeight,
-			 force = /^tr$/i.test( elem.nodeName ); // ticket #4512
+			skip = elem.nodeName.toLowerCase() === "tr";
 
-		return width === 0 && height === 0 && !force ?
+		return width === 0 && height === 0 && !skip ?
 			true :
-				width !== 0 && height !== 0 && !force ?
-					false :
-						jQuery.curCSS(elem, "display") === "none";
+			width > 0 && height > 0 && !skip ?
+				false :
+				jQuery.curCSS(elem, "display") === "none";
 	};
 
-	jQuery.expr.filters.visible = function(elem){
-		return !jQuery.expr.filters.hidden(elem);
+	jQuery.expr.filters.visible = function( elem ) {
+		return !jQuery.expr.filters.hidden( elem );
 	};
 }