From a4ab6ccf1ce1d0027639e3331358697aadd11e75 Mon Sep 17 00:00:00 2001
From: kborchers <k_borchers@yahoo.com>
Date: Wed, 14 Sep 2011 13:53:15 -0500
Subject: [PATCH] Position: Added a check for fraction support in element
 positions based on @inukshuk's original method

---
 ui/jquery.ui.position.js | 49 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/ui/jquery.ui.position.js b/ui/jquery.ui.position.js
index 24a033fc212..314fae1cf2a 100644
--- a/ui/jquery.ui.position.js
+++ b/ui/jquery.ui.position.js
@@ -17,6 +17,7 @@ var rhorizontal = /left|center|right/,
 	rposition = /^\w+/,
 	rpercent = /%$/,
 	center = "center",
+	support = {},
 	_position = $.fn.position;
 
 $.position = {
@@ -183,6 +184,11 @@ $.fn.position = function( options ) {
 		position.left += myOffset[ 0 ];
 		position.top += myOffset[ 1 ];
 
+		if ( !support.fractions ) {
+			position.left = Math.round( position.left );
+			position.top = Math.round( position.top );
+		}
+
 		collisionPosition = {
 			marginLeft: marginLeft,
 			marginTop: marginTop
@@ -406,6 +412,49 @@ $.ui.position = {
 	}
 };
 
+// fraction support test (older versions of jQuery and certain browsers don't support fractions)
+(function () {
+	var body = document.getElementsByTagName( "body" )[ 0 ], 
+		div = document.createElement( "div" ),
+		testElement, testElementParent, testElementStyle, offset, offsetTotal;
+
+	//Create a "fake body" for testing based on method used in jQuery.support
+	testElement = document.createElement( body ? "div" : "body" );
+	testElementStyle = {
+		visibility: "hidden",
+		width: 0,
+		height: 0,
+		border: 0,
+		margin: 0,
+		background: "none"
+	};
+	if ( body ) {
+		jQuery.extend( testElementStyle, {
+			position: "absolute",
+			left: "-1000px",
+			top: "-1000px"
+		});
+	}
+	for ( i in testElementStyle ) {
+		testElement.style[ i ] = testElementStyle[ i ];
+	}
+	testElement.appendChild( div );
+	testElementParent = body || document.documentElement;
+	testElementParent.insertBefore( testElement, testElementParent.firstChild );
+	
+	div.style.cssText = "position: absolute; left: 10.7432222px; top: 10.432325px; height: 30px; width: 201px;";
+
+	offset = $( div ).offset( function( _, offset ) {
+		return offset;
+	}).offset();
+
+	testElement.innerHTML = "";
+	testElementParent.removeChild( testElement );
+
+	offsetTotal = offset.top + offset.left + ( body ? 2000 : 0 );
+	support.fractions = offsetTotal > 21.0 && offsetTotal < 22;
+})();
+
 // DEPRECATED
 if ( $.uiBackCompat !== false ) {
 	// offset option