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<!DOCTYPE HTML>↩
<html style="background:white">↩
<body>↩
<canvas id="b" style="position:absolute; left:0; top:0" width="20" height="20"></canvas>↩
<div style="position:absolute; left:0; top:0; transform:rotate(45deg); height:400px; width:400px; opacity:0.5; border:1px solid black;"></div>↩
<div style="position:absolute; left:-3px; top:-3px; transform:rotate(45deg); height:390px; width:390px; border:10px solid red;"></div>↩
<script>↩
function fillCanvas(id) {↩
var ctx = document.getElementById(id).getContext("2d");↩
ctx.fillStyle = "black";↩
ctx.fillRect(0, 0, 10, 10);↩
}↩
fillCanvas("b");↩
</script>↩
</body>↩
</html>↩