testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.4.html

   1 <!DOCTYPE html>
   2 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
   3 <title>OffscreenCanvas test: 2d.shadow.alpha.4</title>
   4 <script src="/resources/testharness.js"></script>
   5 <script src="/resources/testharnessreport.js"></script>
   6 <script src="/html/canvas/resources/canvas-tests.js"></script>
   7
   8 <h1>2d.shadow.alpha.4</h1>
   9 <p class="desc">Shadows with alpha components are correctly affected by globalAlpha</p>
  10
  11
  12 <script>
  13 var t = async_test("Shadows with alpha components are correctly affected by globalAlpha");
  14 var t_pass = t.done.bind(t);
  15 var t_fail = t.step_func(function(reason) {
  16     throw reason;
  17 });
  18 t.step(function() {
  19
  20 var canvas = new OffscreenCanvas(100, 50);
  21 var ctx = canvas.getContext('2d');
  22
  23 ctx.fillStyle = '#f00';
  24 ctx.fillRect(0, 0, 100, 50);
  25 ctx.fillStyle = '#f00'; // (work around broken Firefox globalAlpha caching)
  26 ctx.shadowColor = 'rgba(0, 0, 255, 0.707)';
  27 ctx.shadowOffsetY = 50;
  28 ctx.globalAlpha = 0.707;
  29 ctx.fillRect(0, -50, 100, 50);
  30 _assertPixelApprox(canvas, 50,25, 127,0,127,255, 2);
  31 t.done();
  32
  33 });
  34 </script>