0px-size-font-shadow.html

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<!DOCTYPE HTML>

<body>

<canvas id="canv" width="5" height="5"></canvas>

<script>

var canv = document.getElementById("canv");

var ctx = canv.getContext("2d");

ctx.fillStyle = "red";

// 0 size font shouldn't assert!

ctx.font = "0px Arial";

ctx.shadowColor = '#f00';

ctx.shadowBlur = 4;

ctx.fillText("A", 0, 0);

document.documentElement.className = "";

</script>

</body>

</html>