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Test Info:

<!DOCTYPE html>
#rel {
position: relative;
margin: 0;
padding: 0;
.abs {
position: absolute;
margin: 0;
padding: 0;
top: 25px;
left: 25px;
width: 50px;
height: 50px;
background-color: green;
#bad {
background-color: blue;
The green square should not completely cover the blue square.
<div class="abs" id="bad"></div>
<thead id="rel">
<div class="abs"></div>