Get a CSS value with JavaScript

Question

I know I can set a CSS value through JavaScript such as:

document.getElementById(\'image_1\').style.top = \'100px\';

But, can I

Answer 1

You can use getComputedStyle().

var element = document.getElementById('image_1'),
    style = window.getComputedStyle(element),
    top = style.getPropertyValue('top');

jsFiddle.