window.onload = function () { //create paper var paper = Raphael(0,0,"100%","100%"); paper.rect(0,0,1000,1000).attr({fill:"#999",opacity:0.9}); }
<div id="canvas">わたし、ラファエルさんに包まれてる</div>
body,html { height:100%; margin:0; } #canvas { height:99%; background:#aaa; }