LayoutTests/http/tests/preload/single_download_preload_runner.html - WebKit - Git at Google

 <!DOCTYPE html>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script>
     if (window.internals) {
         internals.setLinkPreloadSupport(true);
         internals.setResourceTimingSupport(true);
     }
     var t = async_test('Makes sure that preloaded resources are not downloaded again when used');

     window.addEventListener("message", t.step_func(function(event) {
         var data = event.data;
         assert_equals(data, 10, "The number of resource downloads");
         if (window.internals) {
             internals.setLinkPreloadSupport(false);
             internals.setResourceTimingSupport(false);
         }
         t.done();
     }));
 </script>
 <iframe src="resources/single_download_preload.html" onerror="assert_unreached();t.done()"></iframe>
	<!DOCTYPE html>
	<script src="/resources/testharness.js"></script>
	<script src="/resources/testharnessreport.js"></script>
	<script>
	if (window.internals) {
	internals.setLinkPreloadSupport(true);
	internals.setResourceTimingSupport(true);
	}
	var t = async_test('Makes sure that preloaded resources are not downloaded again when used');

	window.addEventListener("message", t.step_func(function(event) {
	var data = event.data;
	assert_equals(data, 10, "The number of resource downloads");
	if (window.internals) {
	internals.setLinkPreloadSupport(false);
	internals.setResourceTimingSupport(false);
	}
	t.done();
	}));
	</script>
	<iframe src="resources/single_download_preload.html" onerror="assert_unreached();t.done()"></iframe>