Html 在 <canvas> 中放置一个 <div>
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Placing a <div> within a <canvas>
提问by thecodeparadox
I take a divwithin a canvaselement like following:
我div在一个canvas元素中取一个，如下所示：
<canvas>
<div></div>
</canvas>
Here both of them has height and width. But here I can't see the div!
这里它们都有高度和宽度。但是在这里我看不到div！
Is it not possible to take a divor pwithin a canvas?
不能在 adiv或pin 内使用canvas吗？
回答by Phrogz
You cannot place elements inside a canvas (and have both displayed); they are only displayed if the browser does not understand the canvas element.
您不能将元素放置在画布内（并且两者都显示）；它们仅在浏览器不理解画布元素时显示。
If you would like to position elements over the same area as a canvas, here is one technique (among many) that would let you do it:
如果您想将元素放置在与画布相同的区域上，这里有一种技术（其中很多）可以让您做到这一点：
HTML
HTML
<div id="canvas-wrap">
<canvas width="800" height="600"></canvas>
<div id="overlay"></div>
</div>
CSS
CSS
#canvas-wrap { position:relative } /* Make this a positioned parent */
#overlay { position:absolute; top:20px; left:30px; }
Here's another technique, which lets the content of the div flow normally and makes the canvas a background to the content:
这是另一种技术，它可以让 div 的内容正常流动，并使画布成为内容的背景：
CSS
CSS
#canvas-wrap { position:relative; width:800px; height:600px }
#canvas-wrap canvas { position:absolute; top:0; left:0; z-index:0 }
