Added some unit tests for position method. Fixed issue with position in IE.

src/offset.js

@@ -91,8 +91,8 @@ jQuery.fn.offset = function() {
 	}
 
 	function add(l, t) {
-		left += parseInt(l) || 0;
-		top += parseInt(t) || 0;
+		left += parseInt(l, 10) || 0;
+		top += parseInt(t, 10) || 0;
 	}
 
 	return results;
@@ -107,17 +107,17 @@ jQuery.fn.extend({
 			// Get *real* offsetParent
 			var offsetParent = this.offsetParent(),
 
-				// Get correct offsets
-				offset       = this.offset(),				
-				parentOffset = offsetParent.offset();
+			// Get correct offsets
+			offset       = this.offset(),
+			parentOffset = /^body|html$/i.test(offsetParent[0].tagName) ? { top: 0, left: 0 } : offsetParent.offset();
 
 			// Subtract element margins
-			offset.top  -= num( this, 'marginTop' );
-			offset.left -= num( this, 'marginLeft' );
+			offset.top  -= parseInt( jQuery.curCSS( this[0], 'marginTop',  true ), 10 ) || 0;
+			offset.left -= parseInt( jQuery.curCSS( this[0], 'marginLeft', true ), 10 ) || 0;
 
 			// Add offsetParent borders
-			parentOffset.top  += num( offsetParent, 'borderTopWidth' );
-			parentOffset.left += num( offsetParent, 'borderLeftWidth' );
+			parentOffset.top  += parseInt( jQuery.curCSS( offsetParent[0], 'borderTopWidth',  true ), 10 ) || 0;
+			parentOffset.left += parseInt( jQuery.curCSS( offsetParent[0], 'borderLeftWidth', true ), 10 ) || 0;
 
 			// Subtract the two offsets
 			results = {

test/data/offset/absolute.html

@@ -12,12 +12,15 @@
 					#absolute-1-1-1 { top: 1px; left: 1px; }
 			#absolute-2 { top: 19px; left: 19px; }
 			#marker { position: absolute; border: 2px solid #000; width: 50px; height: 50px; background: #ccc; }
+			p.instructions { position: absolute; bottom: 0; }
 		</style>
 		<script type="text/javascript" src="../../../dist/jquery.js"></script>
 		<script type="text/javascript" charset="utf-8">
 			$(function() {
 				$('.absolute').click(function() {
 					$('#marker').css( $(this).offset() );
+					var pos = $(this).position();
+					$(this).css({ top: pos.top, left: pos.left });
 					return false;
 				});
 			});
@@ -31,5 +34,6 @@
 		</div>
 		<div id="absolute-2" class="absolute">absolute-2</div>
 		<div id="marker"></div>
+		<p class="instructions">Click the white box to move the marker to it. Clicking the box also changes the position to absolute (if not already) and sets the position according to the position method.</p>
 	</body>
 </html>
\ No newline at end of file

test/data/offset/relative.html

@@ -15,6 +15,8 @@
 			$(function() {
 				$('.relative').click(function() {
 					$('#marker').css( $(this).offset() );
+					var pos = $(this).position();
+					$(this).css({ position: 'absolute', top: pos.top, left: pos.left });
 					return false;
 				});
 			});
@@ -24,5 +26,6 @@
 		<div id="relative-1" class="relative"><div id="relative-1-1" class="relative"><div id="relative-1-1-1" class="relative"></div></div></div>
 		<div id="relative-2" class="relative"></div>
 		<div id="marker"></div>
+		<p class="instructions">Click the white box to move the marker to it. Clicking the box also changes the position to absolute (if not already) and sets the position according to the position method.</p>
 	</body>
 </html>
\ No newline at end of file

test/data/offset/scroll.html

@@ -34,5 +34,6 @@
 		</div>
 		<div id="forceScroll"></div>
 		<div id="marker"></div>
+		<p class="instructions">Click the white box to move the marker to it. Clicking the box also changes the position to absolute (if not already) and sets the position according to the position method.</p>
 	</body>
 </html>
\ No newline at end of file

test/data/offset/static.html

@@ -24,5 +24,6 @@
 		<div id="static-1" class="static"><div id="static-1-1" class="static"><div id="static-1-1-1" class="static"></div></div></div>
 		<div id="static-2" class="static"></div>
 		<div id="marker"></div>
+		<p class="instructions">Click the white box to move the marker to it. Clicking the box also changes the position to absolute (if not already) and sets the position according to the position method.</p>
 	</body>
 </html>
\ No newline at end of file

test/data/offset/table.html

@@ -38,5 +38,6 @@
 			</tbody>
 		</table>
 		<div id="marker"></div>
+		<p class="instructions">Click the white box to move the marker to it. Clicking the box also changes the position to absolute (if not already) and sets the position according to the position method.</p>
 	</body>
 </html>
\ No newline at end of file

test/unit/offset.js

@@ -35,39 +35,89 @@ testwin("absolute", function() {
 	equals( $w('#absolute-2').offset().top, 20, "$('#absolute-2').offset().top" );
 	equals( $w('#absolute-2').offset().left, 20, "$('#absolute-2').offset().left" );
 	
+	
+	equals( $w('#absolute-1').position().top, 0, "$('#absolute-1').position().top" );
+	equals( $w('#absolute-1').position().left, 0, "$('#absolute-1').position().left" );
+	
+	equals( $w('#absolute-1-1').position().top, 1, "$('#absolute-1-1').position().top" );
+	equals( $w('#absolute-1-1').position().left, 1, "$('#absolute-1-1').position().left" );
+	
+	equals( $w('#absolute-1-1-1').position().top, 1, "$('#absolute-1-1-1').position().top" );
+	equals( $w('#absolute-1-1-1').position().left, 1, "$('#absolute-1-1-1').position().left" );
+	
+	equals( $w('#absolute-2').position().top, 19, "$('#absolute-2').position().top" );
+	equals( $w('#absolute-2').position().left, 19, "$('#absolute-2').position().left" );
+	
 	testwin["absolute"].close();
 });
 
 testwin("relative", function() {
 	var $w = testwin["relative"].$;
 	
+	// IE is collapsing the top margin of 1px
 	equals( $w('#relative-1').offset().top, $.browser.msie ? 6 : 7, "$('#relative-1').offset().top" );
 	equals( $w('#relative-1').offset().left, 7, "$('#relative-1').offset().left" );
 	
+	// IE is collapsing the top margin of 1px
 	equals( $w('#relative-1-1').offset().top, $.browser.msie ? 13 : 15, "$('#relative-1-1').offset().top" );
 	equals( $w('#relative-1-1').offset().left, 15, "$('#relative-1-1').offset().left" );
 	
+	// IE is collapsing the top margin of 1px
 	equals( $w('#relative-2').offset().top, $.browser.msie ? 141 : 142, "$('#relative-2').offset().top" );
 	equals( $w('#relative-2').offset().left, 27, "$('#relative-2').offset().left" );
 	
+	
+	// IE is collapsing the top margin of 1px
+	equals( $w('#relative-1').position().top, $.browser.msie ? 5 : 6, "$('#relative-1').position().top" );
+	equals( $w('#relative-1').position().left, 6, "$('#relative-1').position().left" );
+	
+	// IE is collapsing the top margin of 1px
+	equals( $w('#relative-1-1').position().top, $.browser.msie ? 4 : 5, "$('#relative-1-1').position().top" );
+	equals( $w('#relative-1-1').position().left, 5, "$('#relative-1-1').position().left" );
+	
+	// IE is collapsing the top margin of 1px
+	equals( $w('#relative-2').position().top, $.browser.msie ? 140 : 141, "$('#relative-2').position().top" );
+	equals( $w('#relative-2').position().left, 26, "$('#relative-2').position().left" );
+	
 	testwin["relative"].close();
 });
 
 testwin("static", function() {
 	var $w = testwin["static"].$;
 	
+	// IE is collapsing the top margin of 1px
 	equals( $w('#static-1').offset().top, $.browser.msie ? 6 : 7, "$('#static-1').offset().top" );
 	equals( $w('#static-1').offset().left, 7, "$('#static-1').offset().left" );
 	
+	// IE is collapsing the top margin of 1px
 	equals( $w('#static-1-1').offset().top, $.browser.msie ? 13 : 15, "$('#static-1-1').offset().top" );
 	equals( $w('#static-1-1').offset().left, 15, "$('#static-1-1').offset().left" );
 	
+	// IE is collapsing the top margin of 1px
 	equals( $w('#static-1-1-1').offset().top, $.browser.msie ? 20 : 23, "$('#static-1-1-1').offset().top" );
 	equals( $w('#static-1-1-1').offset().left, 23, "$('#static-1-1-1').offset().left" );
 	
+	// IE is collapsing the top margin of 1px
 	equals( $w('#static-2').offset().top, $.browser.msie ? 121 : 122, "$('#static-2').offset().top" );
 	equals( $w('#static-2').offset().left, 7, "$('#static-2').offset().left" );
 	
+	
+	// IE is collapsing the top margin of 1px
+	equals( $w('#static-1').position().top, $.browser.msie ? 5 : 6, "$('#static-1').position().top" );
+	equals( $w('#static-1').position().left, 6, "$('#static-1').position().left" );
+	
+	// IE is collapsing the top margin of 1px
+	equals( $w('#static-1-1').position().top, $.browser.msie ? 12 : 14, "$('#static-1-1').position().top" );
+	equals( $w('#static-1-1').position().left, 14, "$('#static-1-1').position().left" );
+	
+	// IE is collapsing the top margin of 1px
+	equals( $w('#static-1-1-1').position().top, $.browser.msie ? 19 : 22, "$('#static-1-1-1').position().top" );
+	equals( $w('#static-1-1-1').position().left, 22, "$('#static-1-1-1').position().left" );
+	
+	// IE is collapsing the top margin of 1px
+	equals( $w('#static-2').position().top, $.browser.msie ? 120 : 121, "$('#static-2').position().top" );
+	equals( $w('#static-2').position().left, 6, "$('#static-2').position().left" );
+	
 	testwin["static"].close();
 });
 
@@ -102,9 +152,11 @@ testwin("table", function() {
 testwin("scroll", function() {
 	var $w = testwin["scroll"].$;
 	
+	// IE is collapsing the top margin of 1px
 	equals( $w('#scroll-1').offset().top, $.browser.msie ? 6 : 7, "$('#scroll-1').offset().top" );
 	equals( $w('#scroll-1').offset().left, 7, "$('#scroll-1').offset().left" );
 	
+	// IE is collapsing the top margin of 1px
 	equals( $w('#scroll-1-1').offset().top, $.browser.msie ? 9 : 11, "$('#scroll-1-1').offset().top" );
 	equals( $w('#scroll-1-1').offset().left, 11, "$('#scroll-1-1').offset().left" );