Retrieve the position (X,Y) of an HTML element relative to the browser window

Question

I want to know how to get the X and Y position of HTML elements such as img and div in JavaScript relative to the browser window.

Answer 1

Since different browsers are rendering border, padding, margin and etc in different way. I wrote a little function to retrieve top and left positions of specific element in every root element that you want in precise dimension:

function getTop(root, offset) {
    var rootRect = root.getBoundingClientRect();
    var offsetRect = offset.getBoundingClientRect();
    return offsetRect.top - rootRect.top;
}

For retrieve left position you must return:

    return offsetRect.left - rootRect.left;