Javascript element style

Question

I\'m curious why this one

    fdsfsd

.overlay{
    width: 100px;
    height: 200px;
    background-color:red;
}
         


        

Answer 1

The JavaScript .style only relates to inline styles on the element.

See Documentation.

If you want to get the width of an element you should use offsetWidth.

document.getElementsByClassName("overlay")[0].offsetWidth

http://jsfiddle.net/9kwap3zy/7/