File: canvas-paint-order.html

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<!DOCTYPE html>
<title>Canvas paint order</title>
<link rel="author" title="Philip Rogers" href="pdr@chromium.org">
<link rel="help" href="https://www.w3.org/TR/CSS2/zindex.html">
<link rel="match" href="canvas-paint-order-ref.html">
<style>
  #canvas {
    background: red;
    width: 95px;
    height: 95px;
  }
  #negative-margin {
    display: inline-block;
    width: 100px;
    height: 100px;
    background: green;
    margin-left: -100px;
  }
</style>
<canvas id="canvas"></canvas>
<!-- #negative-margin should paint fully on top of the canvas. -->
<div id="negative-margin"></div>
<script>
  onload = function() {
    var context = canvas.getContext("2d");
    context.save();
    context.fillStyle = "red";
    context.fillRect(0, 0, 500, 500);
    context.restore();
  };
</script>