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chromium/third_party/blink/web_tests/external/wpt/svg/types/scripted/SVGLengthList-getItem.html 

<!DOCTYPE HTML>
<title>SVGLengthList, getItem()</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<svg width="200" height="200">
    <text x="50 100 150" y="50">ABC</text>
</svg>
<script>
test(function() {
  // This is a test of the SVGLengthList::getItem() API.
  var xList = document.querySelector("text").x.baseVal;

  // Check lengths of text x item lists.
  assert_equals(xList.numberOfItems, 3);

  // Test with various index parameters.
  assert_throws_dom("IndexSizeError", function() { xList.getItem(-100); });
  assert_throws_dom("IndexSizeError", function() { xList.getItem(-1); });
  assert_equals(xList.getItem(0).value, 50);
  assert_equals(xList.getItem(1).value, 100);
  assert_equals(xList.getItem(2).value, 150);
  assert_throws_dom("IndexSizeError", function() { xList.getItem(3); });
  assert_throws_dom("IndexSizeError", function() { xList.getItem(100); });
});
</script>