Fix #12536. Start at .offset() 0,0 if no getBoundingClientRect.

This lets us still add the other offset components to the number so they're less wrong. Affects BlackBerry 5 and iOS 3, everyone else has gBCR.

src/offset.js

@@ -9,7 +9,8 @@ jQuery.fn.offset = function( options ) {
 			});
 	}
 
-	var box, docElem, body, win, clientTop, clientLeft, scrollTop, scrollLeft, top, left,
+	var docElem, body, win, clientTop, clientLeft, scrollTop, scrollLeft,
+		box = { top: 0, left: 0 },
 		elem = this[ 0 ],
 		doc = elem && elem.ownerDocument;
 
@@ -23,21 +24,25 @@ jQuery.fn.offset = function( options ) {
 
 	docElem = doc.documentElement;
 
-	// Make sure we have the API and we're it's not a disconnected DOM node
-	if ( typeof elem.getBoundingClientRect === "undefined" || !jQuery.contains( docElem, elem ) ) {
-		return { top: 0, left: 0 };
+	// Make sure it's not a disconnected DOM node
+	if ( !jQuery.contains( docElem, elem ) ) {
+		return box;
 	}
 
-	box = elem.getBoundingClientRect();
+	// If we don't have gBCR, just use 0,0 rather than error
+	// BlackBerry 5, iOS 3 (original iPhone)
+	if ( typeof elem.getBoundingClientRect !== "undefined" ) {
+		box = elem.getBoundingClientRect();
+	}
 	win = getWindow( doc );
 	clientTop  = docElem.clientTop  || body.clientTop  || 0;
 	clientLeft = docElem.clientLeft || body.clientLeft || 0;
 	scrollTop  = win.pageYOffset || docElem.scrollTop;
 	scrollLeft = win.pageXOffset || docElem.scrollLeft;
-	top  = box.top  + scrollTop  - clientTop;
-	left = box.left + scrollLeft - clientLeft;
-
-	return { top: top, left: left };
+	return {
+		top: box.top  + scrollTop  - clientTop,
+		left: box.left + scrollLeft - clientLeft
+	};
 };
 
 jQuery.offset = {

sizzle @ 0a488ce5

-Subproject commit 9fb909e71fe0e152f80bf04198cc2b2098756c81
+Subproject commit 0a488ce5fa817bfa371658fc6cf0bd3214c5f3d5