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diff --git a/testing/web-platform/tests/resource-timing/tojson.html b/testing/web-platform/tests/resource-timing/tojson.html
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+++ b/testing/web-platform/tests/resource-timing/tojson.html
@@ -0,0 +1,71 @@
+<!doctype html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>This test validates that PerformanceResourceTiming's toJSON method
+       contains all of the entry's attributes.</title>
+<link rel="author" title="Google" href="http://www.google.com/" />
+<link rel="help"
+      href="https://www.w3.org/TR/resource-timing-2/#dom-performanceresourcetiming-tojson">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<script>
+promise_test(() => {
+  return new Promise((resolve, reject) => {
+    const po = new PerformanceObserver(list => {
+      const entries = list.getEntries();
+      if (entries.length < 1) {
+        throw new Error(`No entries to run the test with.`);
+      }
+      assert_greater_than_equal(entries.length, 1);
+      const entry = entries[0];
+      assert_equals(typeof(entry.toJSON), 'function');
+      const json = entry.toJSON();
+      assert_equals(typeof(json), 'object');
+
+      const performanceResourceTimingKeys = [
+        'name',
+        'entryType',
+        'startTime',
+        'duration',
+        'initiatorType',
+        'nextHopProtocol',
+        'workerStart',
+        'redirectStart',
+        'redirectEnd',
+        'fetchStart',
+        'domainLookupStart',
+        'domainLookupEnd',
+        'connectStart',
+        'connectEnd',
+        'secureConnectionStart',
+        'requestStart',
+        'responseStart',
+        'responseEnd',
+        'transferSize',
+        'encodedBodySize',
+        'decodedBodySize',
+        'renderBlockingStatus',
+        'responseStatus',
+        'contentType',
+      ];
+      for (const key of performanceResourceTimingKeys) {
+        try {
+          assert_false(json[key] === undefined,
+            `entry.toJSON().${key} is undefined`);
+          assert_equals(json[key], entry[key],
+            `entry.toJSON().${key} should match entry.${key}`);
+        } catch(e) {
+          reject(e);
+        }
+      }
+      resolve();
+    });
+    po.observe({type: "resource", buffered: true});
+  });
+}, 'Test toJSON() in PerformanceResourceTiming');
+</script>
+</body>
+</html>