How to overlay two rectangles on top of each other in html5
This article introduces how to superimpose two rectangles on each other in html5. Be careful to use a browser that supports html5
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Canvas Primer - Example: Drawing shadows</title>
<script type="text/javascript">
window.addEventListener('load', function () {
//得到canvas，并检测是否支持canvas
var elem = document.getElementById('myCanvas');
if (!elem || !elem.getContext) {
return;
}
// 得到可以画图的上下文context
var context = elem.getContext('2d');
if (!context) {
return;
}
// 分别设置阴影的偏移坐标，阴影的虚化程度，阴影的颜色，图形的填充颜色，以及绘制图形。
context.shadowOffsetX = 10;
context.shadowOffsetY = 10;
context.shadowBlur = 4;
context.shadowColor = 'red';
context.fillStyle = '#00f';
context.fillRect(20, 20, 150, 100);
}, false);
</script>
</head>
<body>
<p><canvas id="myCanvas" width="300" height="150">Your browser does not have
support for Canvas. </canvas></p>
</body>
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