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

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

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

  // Check initial targetX value.
  assert_true(feConvolveMatrix.targetX instanceof SVGAnimatedInteger);
  assert_equals(typeof(feConvolveMatrix.targetX.baseVal), "number");
  assert_equals(feConvolveMatrix.targetX.baseVal, 0);

  // Check that integers are static, caching value in a local variable and modifying it, should have no effect.
  var numRef = feConvolveMatrix.targetX.baseVal;
  numRef = 100;
  assert_equals(numRef, 100);
  assert_equals(feConvolveMatrix.targetX.baseVal, 0);

  // Check assigning various valid and invalid values.
  feConvolveMatrix.targetX.baseVal = -1;
  assert_equals(feConvolveMatrix.targetX.baseVal, -1); // Negative values are allowed from SVG DOM, but should lead to an error when rendering (disable the filter)
  feConvolveMatrix.targetX.baseVal = 300;
  assert_equals(feConvolveMatrix.targetX.baseVal, 300);
  // ECMA-262, 9.5, "ToInt32"
  feConvolveMatrix.targetX.baseVal = 'aString';
  assert_equals(feConvolveMatrix.targetX.baseVal, 0);
  feConvolveMatrix.targetX.baseVal = feConvolveMatrix;
  assert_equals(feConvolveMatrix.targetX.baseVal, 0);
  feConvolveMatrix.targetX.baseVal = 300;
  assert_equals(feConvolveMatrix.targetX.baseVal, 300);
});
</script>