<!DOCTYPE html>
<p>Test adding an ::after pseudo element that's a spanner.</p>
<p>There should be two rectangles with identical sizes below. The first one should be blue
    with nothing inside. The second one should be yellow with some dots inside.</p>
<div style="line-height:100px; background:blue;">
    <br>
    <div style="background:yellow;">..........</div>
</div>