C<canvas id="c"></canvas>
O<div id="o"></div>
S<script>
window.onload = function ()
{
	function o(t) { document.getElementById('o').innerHTML += t + "<br>" }
	try{
	var ctx = document.getElementById('c').getContext('2d');
	//o(ctx);
	o(ctx.clearRect(0, 0, 100, 100));
	o(ctx.fillStyle = 'green');
	o(ctx.save());
	o(ctx.moveTo(10, 10));
	o(ctx.lineTo(20, 20));
	o(ctx.fill());
	o(ctx.restore());
	}catch(e){o(e)}
}
</script>