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diff --git a/testing/web-platform/tests/WebCryptoAPI/randomUUID.https.any.js b/testing/web-platform/tests/WebCryptoAPI/randomUUID.https.any.js
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+++ b/testing/web-platform/tests/WebCryptoAPI/randomUUID.https.any.js
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+// Run for enough iterations that we're likely to catch edge-cases, like
+// failing to set a reserved bit:
+const iterations = 256;
+// Track all the UUIDs generated during test run, bail if we ever collide:
+const uuids = new Set()
+function randomUUID() {
+    const uuid = self.crypto.randomUUID();
+    if (uuids.has(uuid)) {
+        throw new Error(`uuid collision ${uuid}`)
+    }
+    uuids.add(uuid);
+    return uuid;
+}
+
+// UUID is in namespace format (16 bytes separated by dashes):
+test(function() {
+    const UUIDRegex = /^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$/
+    for (let i = 0; i < iterations; i++) {
+        assert_true(UUIDRegex.test(randomUUID()));
+    }
+}, "namespace format");
+
+// Set the 4 most significant bits of array[6], which represent the UUID
+// version, to 0b0100:
+test(function() {
+    for (let i = 0; i < iterations; i++) {
+        let value = parseInt(randomUUID().split('-')[2].slice(0, 2), 16);
+        value &= 0b11110000;
+        assert_true(value === 0b01000000);
+    }
+}, "version set");
+
+// Set the 2 most significant bits of array[8], which represent the UUID
+// variant, to 0b10:
+test(function() {
+    for (let i = 0; i < iterations; i++) {
+        // Grab the byte representing array[8]:
+        let value = parseInt(randomUUID().split('-')[3].slice(0, 2), 16);
+        value &= 0b11000000
+        assert_true(value === 0b10000000);
+    }
+}, "variant set");