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

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

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

  // Check initial preserveAspectRatio value.
  assert_true(svgElement.preserveAspectRatio instanceof SVGAnimatedPreserveAspectRatio);
  assert_true(svgElement.preserveAspectRatio.baseVal instanceof SVGPreserveAspectRatio);
  assert_equals(svgElement.preserveAspectRatio.baseVal.align, SVGPreserveAspectRatio.SVG_PRESERVEASPECTRATIO_XMIDYMID);
  assert_equals(svgElement.preserveAspectRatio.baseVal.meetOrSlice, SVGPreserveAspectRatio.SVG_MEETORSLICE_MEET);

  // Check that preserveAspectRatios are dynamic, caching value in a local variable and modifying it, should take effect;
  var aspectRef = svgElement.preserveAspectRatio.baseVal;
  aspectRef.align = SVGPreserveAspectRatio.SVG_PRESERVEASPECTRATIO_XMAXYMIN;
  aspectRef.meetOrSlice = SVGPreserveAspectRatio.SVG_MEETORSLICE_SLICE;
  assert_equals(aspectRef.align, SVGPreserveAspectRatio.SVG_PRESERVEASPECTRATIO_XMAXYMIN);
  assert_equals(aspectRef.meetOrSlice, SVGPreserveAspectRatio.SVG_MEETORSLICE_SLICE);
  assert_equals(svgElement.preserveAspectRatio.baseVal.align, SVGPreserveAspectRatio.SVG_PRESERVEASPECTRATIO_XMAXYMIN);
  assert_equals(svgElement.preserveAspectRatio.baseVal.meetOrSlice, SVGPreserveAspectRatio.SVG_MEETORSLICE_SLICE);

  // Check that assigning to baseVal has no effect, as no setter is defined.
  // And the preserveAspectRatio align/meetOrSlice remained xMaxYMin/slice.
  svgElement.preserveAspectRatio.baseVal = -1;
  assert_equals(svgElement.preserveAspectRatio.baseVal.align, SVGPreserveAspectRatio.SVG_PRESERVEASPECTRATIO_XMAXYMIN);
  assert_equals(svgElement.preserveAspectRatio.baseVal.meetOrSlice, SVGPreserveAspectRatio.SVG_MEETORSLICE_SLICE);
  svgElement.preserveAspectRatio.baseVal = 'aString';
  assert_equals(svgElement.preserveAspectRatio.baseVal.align, SVGPreserveAspectRatio.SVG_PRESERVEASPECTRATIO_XMAXYMIN);
  assert_equals(svgElement.preserveAspectRatio.baseVal.meetOrSlice, SVGPreserveAspectRatio.SVG_MEETORSLICE_SLICE);
  svgElement.preserveAspectRatio.baseVal = svgElement;
  assert_equals(svgElement.preserveAspectRatio.baseVal.align, SVGPreserveAspectRatio.SVG_PRESERVEASPECTRATIO_XMAXYMIN);
  assert_equals(svgElement.preserveAspectRatio.baseVal.meetOrSlice, SVGPreserveAspectRatio.SVG_MEETORSLICE_SLICE);

  // Check that the preserveAspectRatio baseVal type has not been changed.
  assert_true(svgElement.preserveAspectRatio.baseVal instanceof SVGPreserveAspectRatio);
});
</script>