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<!DOCTYPE html>
<style>
#canvas {
width: 200px;
height: 200px;
}
#child {
margin-left: 100px;
}
#block-child {
opacity: 0.5;
width: 100px;
height: 100px;
background: green;
}
#inline-child {
opacity: 0.5;
color: green;
font-size: 100px;
}
</style>
<div id="canvas">
<div id="child">
<div id="block-child"></div>
<span id="inline-child">A</span>
</div>
</div>