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+<!DOCTYPE HTML>
+<html>
+<head>
+<meta charset="utf-8" />
+<title>This test validates that reducing the buffer size after entries were
+ queued does not drop those entries, nor does it call the
+ resourcetimingbufferfull event callback.</title>
+<link rel="author" title="Google" href="http://www.google.com/" />
+<link rel="help"
+ href="https://www.w3.org/TR/resource-timing-2/#dom-performance-onresourcetimingbufferfull"/>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/resource-loaders.js"></script>
+<script src="resources/buffer-full-utilities.js"></script>
+</head>
+<body>
+<script>
+promise_test(async t => {
+ addAssertUnreachedBufferFull(t);
+ await fillUpTheBufferWithTwoResources();
+ performance.setResourceTimingBufferSize(1);
+ await waitForNextTask();
+ checkEntries(2);
+}, "Test that if the buffer is reduced after entries were added to it, those" +
+ " entries don't get cleared, nor is the resourcetimingbufferfull event" +
+ " being called.");
+</script>
+</body>
+</html>