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chromium/third_party/blink/web_tests/external/wpt/html/canvas/offscreen/text/2d.text.draw.align.start.rtl.html 

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

<h1>2d.text.draw.align.start.rtl</h1>
<p class="desc">textAlign start with rtl is the right edge</p>


<script>
promise_test(async t => {

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

  var f = new FontFace("CanvasTest", "url('/fonts/CanvasTest.ttf')");
  f.load();
  document.fonts.add(f);
  await document.fonts.ready;
  ctx.font = '50px CanvasTest';
  ctx.direction = 'rtl';
  ctx.fillStyle = '#f00';
  ctx.fillRect(0, 0, 100, 50);
  ctx.fillStyle = '#0f0';
  ctx.textAlign = 'start';
  ctx.fillText('DD', 100, 37.5);
  _assertPixelApprox(canvas, 5,5, 0,255,0,255, 2);
  _assertPixelApprox(canvas, 95,5, 0,255,0,255, 2);
  _assertPixelApprox(canvas, 25,25, 0,255,0,255, 2);
  _assertPixelApprox(canvas, 75,25, 0,255,0,255, 2);
  _assertPixelApprox(canvas, 5,45, 0,255,0,255, 2);
  _assertPixelApprox(canvas, 95,45, 0,255,0,255, 2);

}, "textAlign start with rtl is the right edge");
</script>