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offset.js
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Fri, Dec 13, 10:11

offset.js
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import contains from './contains';
import ownerDocument from './ownerDocument';
import scrollLeft from './scrollLeft';
import scrollTop from './scrollTop';
/**
* Returns the offset of a given element, including top and left positions, width and height.
*
* @param node the element
*/
export default function offset(node) {
var doc = ownerDocument(node);
var box = {
top: 0,
left: 0,
height: 0,
width: 0
};
var docElem = doc && doc.documentElement; // Make sure it's not a disconnected DOM node
if (!docElem || !contains(docElem, node)) return box;
if (node.getBoundingClientRect !== undefined) box = node.getBoundingClientRect();
box = {
top: box.top + scrollTop(docElem) - (docElem.clientTop || 0),
left: box.left + scrollLeft(docElem) - (docElem.clientLeft || 0),
width: box.width,
height: box.height
};
return box;
}

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