<style>
div {
width: 50px;
height: 50px;
position: absolute;
top: 0;
}
</style>
<div style="background:blue" onmouseover="alert('never works')"></div>
<div style="background:red" onmouseover="alert('over red!')"></div>
This Pen doesn't use any external CSS resources.
This Pen doesn't use any external JavaScript resources.