canvas-globalAlpha.html

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This WPT test may be referenced by the following Test IDs:
- /html/canvas/element/manual/filters/canvas-globalAlpha.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<link rel="match" href="canvas-opacity-expected.html"/>

<meta name="fuzzy" content="maxDifference=0-2; totalPixels=0-14000">

<body>

  <canvas id="canvas" width="300" height="300"></canvas>

</body>

<script>

  var canvas = document.getElementById('canvas');

  var ctx = canvas.getContext('2d');

  ctx.globalAlpha = 0.75;

  ctx.fillStyle = 'teal';

  ctx.fillRect(10, 10, 50, 50);

  ctx.globalAlpha = 0.5;

  ctx.fillStyle = 'magenta';

  ctx.fillRect(70, 10, 50, 50);

  ctx.globalAlpha = 0.25;

  ctx.fillStyle = 'orange';

  ctx.fillRect(10, 70, 50, 50);

  ctx.globalAlpha = 0;

  ctx.fillStyle = 'chocolate';

  ctx.fillRect(70, 70, 50, 50);

  ctx.globalAlpha = 0.8;

  ctx.fillStyle = 'cyan';

  ctx.fillRect(10, 150, 50, 50);

  ctx.globalAlpha = 0.6;

  ctx.fillStyle = 'red';

  ctx.fillRect(20, 150, 50, 50);

  ctx.globalAlpha = 0.4;

  ctx.fillStyle = 'yellow';

  ctx.fillRect(30, 150, 50, 50);

  ctx.globalAlpha = 0.2;

  ctx.fillStyle = 'green';

  ctx.fillRect(40, 150, 50, 50);

</script>