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chromium/third_party/blink/web_tests/external/wpt/svg/types/scripted/SVGAnimatedNumberList.html 

<!DOCTYPE HTML>
<title>SVGAnimatedNumberList interface - utilizing the rotate property of SVGTextElement</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(function() {
  // This test checks the SVGAnimatedNumberList API - utilizing the rotate property of SVGTextElement.

  var textElement = document.createElementNS("http://www.w3.org/2000/svg", "text");
  textElement.setAttribute("rotate", "50");

  // Check initial rotate value.
  assert_true(textElement.rotate instanceof SVGAnimatedNumberList);
  assert_true(textElement.rotate.baseVal instanceof SVGNumberList);
  assert_equals(textElement.rotate.baseVal.getItem(0).value, 50);

  // Check that number lists are dynamic, caching value in a local variable and modifying it, should take effect.
  var numRef = textElement.rotate.baseVal;
  numRef.getItem(0).value = 100;
  assert_equals(numRef.getItem(0).value, 100);
  assert_equals(textElement.rotate.baseVal.getItem(0).value, 100);

  // Check that assigning to baseVal has no effect, as no setter is defined.
  textElement.rotate.baseVal = -1;
  assert_equals(textElement.rotate.baseVal.getItem(0).value, 100);
  textElement.rotate.baseVal = 'aString';
  assert_equals(textElement.rotate.baseVal.getItem(0).value, 100);
  textElement.rotate.baseVal = textElement;
  assert_equals(textElement.rotate.baseVal.getItem(0).value, 100);

  // Check that the rotate baseVal type has not been changed.
  assert_true(textElement.rotate.baseVal instanceof SVGNumberList);
});
</script>