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diff --git a/testing/web-platform/tests/css/css-toggle/toggle-shorthand-serialization.tentative.html b/testing/web-platform/tests/css/css-toggle/toggle-shorthand-serialization.tentative.html
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+++ b/testing/web-platform/tests/css/css-toggle/toggle-shorthand-serialization.tentative.html
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+<!DOCTYPE HTML>
+<meta charset="UTF-8">
+<title>CSS Toggles: serialization of toggle shorthand</title>
+<link rel="author" title="L. David Baron" href="https://dbaron.org/">
+<link rel="author" title="Google" href="http://www.google.com/">
+<link rel="help" href="https://tabatkins.github.io/css-toggle/#toggle-property">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<body>
+<script>
+
+let tests = [
+  { "toggle-root": null,
+    "toggle-trigger": "mytoggle",
+    "expected": "" },
+  { "toggle-root": "mytoggle",
+    "toggle-trigger": null,
+    "expected": "" },
+  { "toggle-root": "none",
+    "toggle-trigger": "mytoggle",
+    "expected": "" },
+  { "toggle-root": "mytoggle",
+    "toggle-trigger": "none",
+    "expected": "" },
+  { "toggle-root": "none",
+    "toggle-trigger": "none",
+    "expected": "none" },
+  { "toggle-root": "mytoggle",
+    "toggle-trigger": "mytoggle",
+    "expected": "mytoggle" },
+  { "toggle-root": "mytoggle, yourtoggle",
+    "toggle-trigger": "mytoggle",
+    "expected": "" },
+  { "toggle-root": "mytoggle",
+    "toggle-trigger": "mytoggle, yourtoggle",
+    "expected": "" },
+  { "toggle-root": "mytoggle 2",
+    "toggle-trigger": "mytoggle",
+    "expected": "mytoggle 2" },
+  { "toggle-root": "mytoggle 2",
+    "toggle-trigger": "mytoggle 2",
+    "expected": "" },
+  { "toggle-root": "mytoggle 2 at 1",
+    "toggle-trigger": "mytoggle",
+    "expected": "mytoggle 2 at 1" },
+  { "toggle-root": "mytoggle 2 at 1",
+    "toggle-trigger": "mytoggle 1",
+    "expected": "" },
+  { "toggle-root": "mytoggle 2 at 1",
+    "toggle-trigger": "mytoggle 2",
+    "expected": "" },
+  { "toggle-root": "mytoggle 2 at 1 sticky group self",
+    "toggle-trigger": "mytoggle",
+    "expected": "mytoggle 2 at 1 sticky group self" },
+  { "toggle-root": "mytoggle 4 at 2 self sticky group",
+    "toggle-trigger": "mytoggle",
+    "expected": "mytoggle 4 at 2 sticky group self" },
+  { "toggle-root": "mytoggle [one two three] at two self cycle-on group",
+    "toggle-trigger": "mytoggle",
+    "expected": "mytoggle [one two three] at two cycle-on group self" },
+];
+
+for (let t of tests) {
+  test(function() {
+    let element = document.createElement("div");
+    document.body.appendChild(element);
+    if (typeof(t["toggle-root"]) == "string")
+      element.style["toggle-root"] = t["toggle-root"];
+    if (typeof(t["toggle-trigger"]) == "string")
+      element.style["toggle-trigger"] = t["toggle-trigger"];
+    assert_equals(element.style.toggle, t["expected"]);
+    element.remove();
+  }, `Serialization of toggle shorthand with${t["toggle-root"] ? (" toggle-root: " + t["toggle-root"] + ";") : ""}${t["toggle-trigger"] ? (" toggle-trigger: " + t["toggle-trigger"] + ";") : ""}`);
+}
+
+</script>