diff --git a/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-task-queuing.html b/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-task-queuing.html
new file mode 100644
index 00000000000000..1bb05bfb190d2e
--- /dev/null
+++ b/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-task-queuing.html
@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>javascript: URL task queuing</title>
+<link rel="help" href="https://github.com/whatwg/html/issues/3730">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<body>
+<script>
+"use strict";
+
+testIsAsync(() => {
+  const iframe = document.createElement("iframe");
+  document.body.append(iframe);
+  iframe.contentWindow.location.href = "javascript:window.top.javascriptURLRan = true; window.top.resolveTestPromise();";
+}, `Navigating an iframe via location.href to a javascript: URL must queue a task`);
+
+testIsAsync(() => {
+  const iframe = document.createElement("iframe");
+  iframe.src = "javascript:window.top.javascriptURLRan = true; window.top.resolveTestPromise();";
+  document.body.append(iframe);
+}, `Navigating an iframe via src="" to a javascript: URL before insertion must queue a task`);
+
+testIsAsync(() => {
+  const iframe = document.createElement("iframe");
+  document.body.append(iframe);
+  iframe.src = "javascript:window.top.javascriptURLRan = true; window.top.resolveTestPromise();";
+}, `Navigating an iframe via src="" to a javascript: URL after insertion must queue a task`);
+
+testIsAsync(() => {
+  const w = window.open();
+  w.location.href = "javascript:window.opener.javascriptURLRan = true; window.opener.resolveTestPromise();";
+}, `Navigating an opened window via location.href to a javascript: URL must queue a task`);
+
+testIsAsync(() => {
+  window.open("javascript:window.opener.javascriptURLRan = true; window.opener.resolveTestPromise();");
+}, `Navigating an opened window as part of creation to a javascript: URL must queue a task`);
+
+function testIsAsync(setupFunc, description) {
+  promise_test(async t => {
+    t.add_cleanup(() => {
+      delete window.resolveTestPromise;
+      delete window.javascriptURLRan;
+    });
+
+    const ranPromise = new Promise(resolve => {
+      window.resolveTestPromise = resolve;
+    });
+
+    setupFunc();
+
+    assert_equals(window.javascriptURLRan, undefined, "Must not run sync");
+
+    // Ensure that we do actually run the code, though.
+    await ranPromise;
+  }, description);
+}
+</script>
diff --git a/html/semantics/scripting-1/the-script-element/execution-timing/029.html b/html/semantics/scripting-1/the-script-element/execution-timing/029.html
deleted file mode 100644
index 33548e566ac678..00000000000000
--- a/html/semantics/scripting-1/the-script-element/execution-timing/029.html
+++ /dev/null
@@ -1,53 +0,0 @@
-<!DOCTYPE html>
-<html><head>
-        <title> scheduler: javascript: URL in HREF</title>
-        <script src="/resources/testharness.js"></script>
-        <script src="/resources/testharnessreport.js"></script>
-        <script src="testlib/testlib.js"></script>
-</head>
-<body>
-
-        <div id="log">FAILED (This TC requires JavaScript enabled)</div>
-        <p><a href="javascript:log('JS URL')"></a></p>
-        <script>log('inline script #1');
-                window.addEventListener("beforeunload", function( event ) {
-                        log('beforeunload event');
-                });
-                if(document.links[0].click){
-                        document.links[0].click();
-                }else{
-                        var evt = document.createEvent("MouseEvents");
-                        evt.initMouseEvent("click", true, true, window,
-                        0, 0, 0, 0, 0, false, false, false, false, 0, null);
-                        document.links[0].dispatchEvent(evt);
-                }
-                log('end script #1');
-        </script>
-
-        <script type="text/javascript">
-        log( 'inline script #2' );
-        var t = async_test()
-
-        function final_test() {
-                // The JS URL part is required to run in an additional task,
-                // altough that is not fully consistently implemented,
-                // see https://github.com/whatwg/html/issues/3730#issuecomment-492071447
-                assert_any(assert_array_equals, eventOrder, [
-                  ['inline script #1', 'end script #1', 'beforeunload event', 'inline script #2', 'JS URL'],
-                  ['inline script #1', 'end script #1', 'inline script #2', 'beforeunload event', 'JS URL']]);
-                t.done();
-        }
-
-        function test_on_load() {
-                // When the page loads, a task to run the navigate steps
-                // previously enqueued as part of following-hyperlinks,
-                // should have run, and have enqueued another task to execute the JS URL.
-                assert_any(assert_array_equals, eventOrder, [
-                  ['inline script #1', 'end script #1', 'beforeunload event', 'inline script #2'],
-                  ['inline script #1', 'end script #1', 'inline script #2', 'beforeunload event']]);
-                t.step_timeout(final_test, 1000)
-        }
-        onload = t.step_func(test_on_load);
-        </script>
-
-</body></html>
