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  1. if ( "getBoundingClientRect" in document.documentElement )
  2.     jQuery.fn.offset = function() {
  3.         var elem = this[0];
  4.         if ( !elem ) return null;
  5.         if ( elem === elem.ownerDocument.body ) return jQuery.offset.bodyOffset( elem );
  6.         var box = elem.getBoundingClientRect(), doc = elem.ownerDocument, body = doc.body, docElem = doc.documentElement,
  7.             clientTop = docElem.clientTop || body.clientTop || 0, clientLeft = docElem.clientLeft || body.clientLeft || 0,
  8.             top  = box.top  + (self.pageYOffset || jQuery.boxModel && docElem.scrollTop  || body.scrollTop ) - clientTop,
  9.             left = box.left + (self.pageXOffset || jQuery.boxModel && docElem.scrollLeft || body.scrollLeft) - clientLeft;
  10.         return { top: top, left: left };
  11.     };
  12. else
  13.     jQuery.fn.offset = function() {
  14.         var elem = this[0];
  15.         if ( !elem ) return null;
  16.         if ( elem === elem.ownerDocument.body ) return jQuery.offset.bodyOffset( elem );
  17.         jQuery.offset.initialize();
  18.  
  19.         var offsetParent = elem.offsetParent, prevOffsetParent = elem,
  20.             doc = elem.ownerDocument, computedStyle, docElem = doc.documentElement,
  21.             body = doc.body, defaultView = doc.defaultView,
  22.             prevComputedStyle = defaultView.getComputedStyle(elem, null),
  23.             top = elem.offsetTop, left = elem.offsetLeft;
  24.  
  25.         while ( (elem = elem.parentNode) && elem !== body && elem !== docElem ) {
  26.             if ( jQuery.offset.supportsFixedPosition && prevComputedStyle.position === "fixed" ) break;
  27.             computedStyle = defaultView.getComputedStyle(elem, null);
  28.             top -= elem.scrollTop, left -= elem.scrollLeft;
  29.             if ( elem === offsetParent ) {
  30.                 top += elem.offsetTop, left += elem.offsetLeft;
  31.                 if ( jQuery.offset.doesNotAddBorder && !(jQuery.offset.doesAddBorderForTableAndCells && /^t(able|d|h)$/i.test(elem.tagName)) )
  32.                     top  += parseFloat( computedStyle.borderTopWidth,  10) || 0,
  33.                     left += parseFloat( computedStyle.borderLeftWidth, 10) || 0;
  34.                 prevOffsetParent = offsetParent, offsetParent = elem.offsetParent;
  35.             }
  36.             if ( jQuery.offset.subtractsBorderForOverflowNotVisible && computedStyle.overflow !== "visible" )
  37.                 top  += parseFloat( computedStyle.borderTopWidth,  10) || 0,
  38.                 left += parseFloat( computedStyle.borderLeftWidth, 10) || 0;
  39.             prevComputedStyle = computedStyle;
  40.         }
  41.  
  42.         if ( prevComputedStyle.position === "relative" || prevComputedStyle.position === "static" )
  43.             top  += body.offsetTop,
  44.             left += body.offsetLeft;
  45.  
  46.         if ( jQuery.offset.supportsFixedPosition && prevComputedStyle.position === "fixed" )
  47.             top  += Math.max(docElem.scrollTop, body.scrollTop),
  48.             left += Math.max(docElem.scrollLeft, body.scrollLeft);
  49.  
  50.         return { top: top, left: left };
  51.     };
  52.  
  53. jQuery.offset = {
  54.     initialize: function() {
  55.         var body = document.body, container = document.createElement('div'), innerDiv, checkDiv, table, td, prop, bodyMarginTop = body.style.marginTop,
  56.             html = '<div style="position:absolute;top:0;left:0;margin:0;border:5px solid #000;padding:0;width:1px;height:1px;"><div></div></div><table style="position:absolute;top:0;left:0;margin:0;border:5px solid #000;padding:0;width:1px;height:1px;" cellpadding="0" cellspacing="0"><tr><td></td></tr></table>';
  57.  
  58.         jQuery.extend( container.style, { position: 'absolute', top: 0, left: 0, margin: 0, border: 0, width: '1px', height: '1px', visibility: 'hidden' } );
  59.  
  60.         container.innerHTML = html;
  61.         body.insertBefore(container, body.firstChild);
  62.         innerDiv = container.firstChild, checkDiv = innerDiv.firstChild, td = innerDiv.nextSibling.firstChild.firstChild;
  63.  
  64.         this.doesNotAddBorder = (checkDiv.offsetTop !== 5);
  65.         this.doesAddBorderForTableAndCells = (td.offsetTop === 5);
  66.  
  67.         checkDiv.style.position = 'fixed', checkDiv.style.top = '20px';
  68.         this.supportsFixedPosition = (checkDiv.offsetTop >= 15); // safari subtracts parent border width here which is 5px
  69.         checkDiv.style.position = '', checkDiv.style.top = '';
  70.  
  71.         innerDiv.style.overflow = 'hidden', innerDiv.style.position = 'relative';
  72.         this.subtractsBorderForOverflowNotVisible = (checkDiv.offsetTop === -5);
  73.  
  74.         body.style.marginTop = '1px';
  75.         this.doesNotIncludeMarginInBodyOffset = (body.offsetTop === 0);
  76.         body.style.marginTop = bodyMarginTop;
  77.  
  78.         body.removeChild(container);
  79.         jQuery.offset.initialize = function(){};
  80.     },
  81.  
  82.     bodyOffset: function(body) {
  83.         jQuery.offset.initialize();
  84.         var top = body.offsetTop, left = body.offsetLeft;
  85.         if ( jQuery.offset.doesNotIncludeMarginInBodyOffset )
  86.             top  += parseFloat( jQuery.curCSS(body, 'marginTop',  true), 10 ) || 0,
  87.             left += parseFloat( jQuery.curCSS(body, 'marginLeft', true), 10 ) || 0;
  88.         return { top: top, left: left };
  89.     }
  90. };
  91.  
  92.  
  93. jQuery.fn.extend({
  94.     position: function() {
  95.         if ( !this[0] ) return null;
  96.  
  97.         var elem = this[0], left = 0, top = 0, results,
  98.  
  99.         // Get *real* offsetParent
  100.         offsetParent = this.offsetParent(),
  101.  
  102.         // Get correct offsets
  103.         offset       = this.offset(),
  104.         parentOffset = /^body|html$/i.test(offsetParent[0].tagName) ? { top: 0, left: 0 } : offsetParent.offset();
  105.  
  106.         // Subtract element margins
  107.         // note: when an element has margin: auto the offsetLeft and marginLeft
  108.         // are the same in Safari causing offset.left to incorrectly be 0
  109.         offset.top  -= parseFloat( jQuery.curCSS(elem, 'marginTop',  true), 10 ) || 0;
  110.         offset.left -= parseFloat( jQuery.curCSS(elem, 'marginLeft', true), 10 ) || 0;
  111.  
  112.         // Add offsetParent borders
  113.         parentOffset.top  += parseFloat( jQuery.curCSS(offsetParent[0], 'borderTopWidth',  true), 10 ) || 0;
  114.         parentOffset.left += parseFloat( jQuery.curCSS(offsetParent[0], 'borderLeftWidth', true), 10 ) || 0;
  115.  
  116.         // Subtract the two offsets
  117.         results = {
  118.             top:  offset.top  - parentOffset.top,
  119.             left: offset.left - parentOffset.left
  120.         };
  121.  
  122.         return results;
  123.     },
  124.  
  125.     offsetParent: function() {
  126.         var offsetParent = this[0].offsetParent || document.body;
  127.         while ( offsetParent && (!/^body|html$/i.test(offsetParent.tagName) && jQuery.css(offsetParent, 'position') == 'static') )
  128.             offsetParent = offsetParent.offsetParent;
  129.         return jQuery(offsetParent);
  130.     }
  131. });
  132.  
  133.  
  134. // Create scrollLeft and scrollTop methods
  135. jQuery.each( ['Left', 'Top'], function(i, name) {
  136.     var method = 'scroll' + name;
  137.  
  138.     jQuery.fn[ method ] = function(val) {
  139.         if ( !this[0] ) return null;
  140.  
  141.         return val !== undefined ?
  142.  
  143.             // Set the scroll offset
  144.             this.each(function() {
  145.                 this == window || this == document ?
  146.                     window.scrollTo(
  147.                         !i ? val : jQuery(window).scrollLeft(),
  148.                          i ? val : jQuery(window).scrollTop()
  149.                     ) :
  150.                     this[ method ] = val;
  151.             }) :
  152.  
  153.             // Return the scroll offset
  154.             this[0] == window || this[0] == document ?
  155.                 self[ i ? 'pageYOffset' : 'pageXOffset' ] ||
  156.                     jQuery.boxModel && document.documentElement[ method ] ||
  157.                     document.body[ method ] :
  158.                 this[0][ method ];
  159.     };
  160. });
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