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chromium/third_party/blink/web_tests/external/wpt/html/canvas/offscreen/text/2d.text.measure.caret-position-edge-cases.tentative.html 

<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<title>OffscreenCanvas test: 2d.text.measure.caret-position-edge-cases.tentative</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.measure.caret-position-edge-cases.tentative</h1>
<p class="desc">Test the edge cases for caretPositionFromPoint, where the point is at the edge of glyph and at the midpoint.</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 = 'ltr';
  ctx.align = 'left'
  ctx.baseline = 'alphabetic'
  tm = ctx.measureText('A');
  const a_width = tm.width;
  tm = ctx.measureText('B');
  const b_width = tm.width;
  tm = ctx.measureText('C');
  const c_width = tm.width;
  const epsilon = 1.0e-4;

  tm = ctx.measureText('ABC');
  _assert(tm.caretPositionFromPoint(0) == 0, "tm.caretPositionFromPoint(0) == 0");
  _assert(tm.caretPositionFromPoint(a_width / 2) == 0, "tm.caretPositionFromPoint(a_width / 2) == 0");
  _assert(tm.caretPositionFromPoint(a_width / 2 + 1) == 1, "tm.caretPositionFromPoint(a_width / 2 + 1) == 1");
  _assert(tm.caretPositionFromPoint(a_width) == 1, "tm.caretPositionFromPoint(a_width) == 1");
  _assert(tm.caretPositionFromPoint(a_width + b_width / 2) == 1, "tm.caretPositionFromPoint(a_width + b_width / 2) == 1");
  _assert(tm.caretPositionFromPoint(a_width + b_width / 2 + 1) == 2, "tm.caretPositionFromPoint(a_width + b_width / 2 + 1) == 2");
  _assert(tm.caretPositionFromPoint(a_width + b_width) == 2, "tm.caretPositionFromPoint(a_width + b_width) == 2");
  _assert(tm.caretPositionFromPoint(a_width + b_width + c_width / 2) == 2, "tm.caretPositionFromPoint(a_width + b_width + c_width / 2) == 2");
  _assert(tm.caretPositionFromPoint(a_width + b_width + c_width / 2 + 1) == 3, "tm.caretPositionFromPoint(a_width + b_width + c_width / 2 + 1) == 3");
  _assert(tm.caretPositionFromPoint(a_width + b_width + c_width) == 3, "tm.caretPositionFromPoint(a_width + b_width + c_width) == 3");

}, "Test the edge cases for caretPositionFromPoint, where the point is at the edge of glyph and at the midpoint.");
</script>