Can I have an onclick effect in CSS

Question

I have an image element that I want to change on click.

<img id="btnLeft">

This works:

#btnLeft:hover {
    width:70px;
    height:74px;
}

But what I need is:

#btnLeft:onclick {
    width:70px;
    height:74px;
}

But, obviously, it doesn't work. If not using JavaScript, is it even feasible to have onclick behavior in CSS?