chromium/third_party/blink/web_tests/svg/hittest/text-small-font-size-and-viewbox.html

<!DOCTYPE html>
<title>Hit-test of text with fractional (&lt; 1) font-size and small (high scalefactor) viewBox</title>
<script src="../../resources/ahem.js"></script>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<style>
svg {
  margin: 0px;
  padding: 0px;
  position: absolute;
  top: 0px;
  left: 0px;
  width: 800px;
}
</style>
<svg viewBox="0 0 22 28" font-family="Ahem" font-size="0.125" fill="blue">
  <text y="2.438"><a xlink:href="#">ABCDEFGH</a></text>
  <text y="4.698" x="7.571"><a xlink:href="#">ABCDEFGH</a></text>
  <text y="1" x="0" transform="scale(10)"><a xlink:href="#">Link#3</a></text>
</svg>
<script>
test(function() {
  var links = document.querySelectorAll('a');

  // The ideal bounding box of the first link in the document is
  // (0.00, 85.02) - (36.36, 89.56). However, we should have some
  // tolerance because our scaled font size is an integer.
  [
    { x: 2, y: 86 },
    { x: 4, y: 87 },
    { x: 2, y: 88 },
    { x: 6, y: 86 },
    { x: 4, y: 87 },
    { x: 6, y: 88 },
    { x: 10, y: 87 },
    { x: 14, y: 87 },
    { x: 18, y: 87 },
    { x: 22, y: 87 },
    { x: 26, y: 87 },
  ].forEach(function(point) {
    assert_equals(document.elementFromPoint(point.x, point.y), links[0], point.x + ',' + point.y);
  });

  // The ideal bounding box of the second link in the document is
  // (275.31, 167.20) - (311.67, 171.75). However, we should have some
  // tolerance because our scaled font size is an integer.
  [
    { x: 278, y: 169 },
    { x: 276, y: 171 },
    { x: 278, y: 169 },
    { x: 280, y: 171 },
    { x: 284, y: 169 },
    { x: 288, y: 169 },
    { x: 292, y: 169 },
    { x: 296, y: 169 },
    { x: 300, y: 169 },
  ].forEach(function(point) {
    assert_equals(document.elementFromPoint(point.x, point.y), links[1], point.x + ',' + point.y);
  });

  assert_equals(document.elementFromPoint(1, 330), links[2], '1,330');
});
</script>