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

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

  var rectElement = document.createElementNS("http://www.w3.org/2000/svg", "rect");

  // Check initial width value.
  assert_true(rectElement.width instanceof SVGAnimatedLength);
  assert_true(rectElement.width.baseVal instanceof SVGLength);
  assert_equals(rectElement.width.baseVal.value, 0);

  // Check that lengths are dynamic, caching value in a local variable and modifying it, should take effect.
  var numRef = rectElement.width.baseVal;
  numRef.value = 100;
  assert_equals(numRef.value, 100);
  assert_equals(rectElement.width.baseVal.value, 100);

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

  // Check that the width baseVal type has not been changed.
  assert_true(rectElement.width.baseVal instanceof SVGLength);
});
</script>