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

  var convElement = document.createElementNS("http://www.w3.org/2000/svg", "feConvolveMatrix");
  // Check initial preserveAlpha value.
  assert_false(convElement.preserveAlpha.baseVal);

  // Set value to true.
  convElement.preserveAlpha.baseVal = true;
  assert_true(convElement.preserveAlpha.baseVal);

  // Caching baseVal in local variable.
  var baseVal = convElement.preserveAlpha.baseVal;
  assert_true(baseVal);

  // Modify local baseVal variable to false.
  baseVal = false;

  // Assure that convElement.preserveAlpha has not been changed, but the local baseVal variable.
  assert_false(baseVal);
  assert_true(convElement.preserveAlpha.baseVal);

  // Check assigning values of various types.
  // ECMA-262, 9.2, "ToBoolean"
  convElement.preserveAlpha.baseVal = convElement.preserveAlpha;
  assert_true(convElement.preserveAlpha.baseVal);

  convElement.preserveAlpha.baseVal = null;
  assert_false(convElement.preserveAlpha.baseVal);

  convElement.preserveAlpha.baseVal = 'aString';
  assert_true(convElement.preserveAlpha.baseVal);

  convElement.preserveAlpha.baseVal = false;
  assert_false(convElement.preserveAlpha.baseVal);

  convElement.preserveAlpha.baseVal = convElement;
  assert_true(convElement.preserveAlpha.baseVal);
});
</script>