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chromium/third_party/blink/web_tests/external/wpt/touch-events/expose-legacy-touch-event-apis.html 

<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Expose legacy touch event APIs</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
const exposeLegacyTouchEventAPIs = 'ontouchstart' in document;
for (const eventHandler of ['ontouchstart', 'ontouchmove', 'ontouchend', 'ontouchcancel']) {
  for (const eventTarget of [window, HTMLElement.prototype, SVGElement.prototype, Document.prototype]) {
    test(() => {
      assert_equals(eventHandler in eventTarget, exposeLegacyTouchEventAPIs);
    }, `'${eventHandler}' in ${eventTarget}`);
  }
}
</script>