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<!DOCTYPE html>
<html>
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<style>
div {
margin-left: 3px;
}
div::before {
width: 100px;
height: 100px;
margin-left: 2px;
content: 'foo';
color: rgba(0, 0, 0, 0);
}
canvas{
margin-left: 2px;
display: block;
position: relative;
top: -1em;
}
</style>
<body style="font: 10px/1 Ahem;">
<div><canvas width="30px" height="10px"></canvas></div>
<script>
document.addEventListener('DOMContentLoaded', function() {
var canvas = document.querySelector('canvas');
var context = canvas.getContext("2d");
context.fillStyle = 'green';
context.fillRect(0, 0, 30, 10);
});
</script>
</body>
</html>