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chromium/third_party/blink/web_tests/external/wpt/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.CSSRGB.html 

<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<title>OffscreenCanvas test: 2d.fillStyle.CSSRGB</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>

<h1>2d.fillStyle.CSSRGB</h1>
<p class="desc">CSSRGB works as color input</p>


<script>
var t = async_test("CSSRGB works as color input");
var t_pass = t.done.bind(t);
var t_fail = t.step_func(function(reason) {
    throw reason;
});
t.step(function() {

  var canvas = new OffscreenCanvas(100, 50);
  var ctx = canvas.getContext('2d');

  ctx.fillStyle = new CSSRGB(1, 0, 1);
  _assertSame(ctx.fillStyle, '#ff00ff', "ctx.fillStyle", "'#ff00ff'");
  ctx.fillRect(0, 0, 100, 50);
  _assertPixel(canvas, 50,25, 255,0,255,255);

  const color = new CSSRGB(0, CSS.percent(50), 0);
  ctx.fillStyle = color;
  _assertSame(ctx.fillStyle, '#008000', "ctx.fillStyle", "'#008000'");
  ctx.fillRect(0, 0, 100, 50);
  _assertPixel(canvas, 50,25, 0,128,0,255);
  color.g = 0;
  ctx.fillStyle = color;
  _assertSame(ctx.fillStyle, '#000000', "ctx.fillStyle", "'#000000'");
  ctx.fillRect(0, 0, 100, 50);
  _assertPixel(canvas, 50,25, 0,0,0,255);

  color.alpha = 0;
  ctx.fillStyle = color;
  _assertSame(ctx.fillStyle, 'rgba(0, 0, 0, 0)', "ctx.fillStyle", "'rgba(0, 0, 0, 0)'");
  ctx.reset();
  color.alpha = 0.5;
  ctx.fillStyle = color;
  ctx.fillRect(0, 0, 100, 50);
  _assertPixel(canvas, 50,25, 0,0,0,128);

  ctx.fillStyle = new CSSHSL(CSS.deg(0), 1, 1).toRGB();
  _assertSame(ctx.fillStyle, '#ffffff', "ctx.fillStyle", "'#ffffff'");
  ctx.fillRect(0, 0, 100, 50);
  _assertPixel(canvas, 50,25, 255,255,255,255);

  color.alpha = 1;
  color.g = 1;
  ctx.fillStyle = color;
  ctx.fillRect(0, 0, 100, 50);
  t.done();

});
</script>