diff --git a/url/urlsearchparams-sort.html b/url/urlsearchparams-sort.html
new file mode 100644
index 00000000000000..50e0adb211ba51
--- /dev/null
+++ b/url/urlsearchparams-sort.html
@@ -0,0 +1,46 @@
+<!doctype html>
+<meta charset="utf8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id=log></div>
+<script>
+[
+  {
+    "input": "z=b&a=b&z=a&a=a",
+    "output": [["a", "b"], ["a", "a"], ["z", "b"], ["z", "a"]]
+  },
+  {
+    "input": "\uFFFD=x&\uFFFC&\uFFFD=a",
+    "output": [["\uFFFC", ""], ["\uFFFD", "x"], ["\uFFFD", "a"]]
+  },
+  {
+    "input": "ﬃ&🌈", // 🌈 > code point, but < code unit because two code units
+    "output": [["🌈", ""], ["ﬃ", ""]]
+  },
+  {
+    "input": "é&e\uFFFD&e\u0301",
+    "output": [["e\u0301", ""], ["e\uFFFD", ""], ["é", ""]]
+  }
+].forEach((val) => {
+  test(() => {
+    let params = new URLSearchParams(val.input),
+        i = 0
+    params.sort()
+    for(let param of params) {
+      assert_array_equals(param, val.output[i])
+      i++
+    }
+  }, "Parse and sort: " + val.input)
+
+  test(() => {
+    let url = new URL("?" + val.input, "https://example/")
+    url.searchParams.sort()
+    let params = new URLSearchParams(url.search),
+        i = 0
+    for(let param of params) {
+      assert_array_equals(param, val.output[i])
+      i++
+    }
+  }, "URL parse and sort: " + val.input)
+})
+</script>
