diff --git a/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-abort/javascript-url-abort-return-value-string.tentative.html b/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-abort/javascript-url-abort-return-value-string.tentative.html
new file mode 100644
index 00000000000000..f626a79ae66ab4
--- /dev/null
+++ b/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-abort/javascript-url-abort-return-value-string.tentative.html
@@ -0,0 +1,28 @@
+<!doctype html>
+<title>Aborting fetch for javascript:string navigation</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#navigate">
+<link rel="help" href="https://github.com/whatwg/html/issues/2590">
+<div id="log"></div>
+<iframe src="support/iframe-and-links.html"></iframe>
+<script>
+async_test(test => {
+  onload = () => {
+    const child = document.querySelector('iframe').contentWindow;
+    child.document.querySelector("#slowLink").click();
+    // The step below is in a timeout. The framed page can't communicate back mid-parse because that
+    // would involve running script, which makes that navigation "mature", and we need to do this
+    // before it matures.
+    test.step_timeout(() => {
+      child.document.querySelector("#javascriptStringLink").click();
+      child.document.querySelector("iframe").onload = test.step_func_done(() => {
+        assert_false(child.childLoaded, 'child.childLoaded');
+      });
+    }, 100);
+  };
+  window.javascriptStringDocLoaded = test.step_func(() => {
+    assert_unreached("javascript: URL doc replaced the document, should be targeted to child iframe.");
+  });
+});
+</script>
diff --git a/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-abort/javascript-url-abort-return-value-undefined.tentative.html b/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-abort/javascript-url-abort-return-value-undefined.tentative.html
new file mode 100644
index 00000000000000..80a0d27a7d9a8c
--- /dev/null
+++ b/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-abort/javascript-url-abort-return-value-undefined.tentative.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<title>Not aborting fetch for javascript:undefined navigation</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#navigate">
+<link rel="help" href="https://github.com/whatwg/html/issues/2590">
+<div id="log"></div>
+<iframe src="support/iframe-and-links.html"></iframe>
+<script>
+async_test(test => {
+  onload = () => {
+    const child = document.querySelector('iframe').contentWindow;
+    child.document.querySelector("#slowLink").click();
+    // The step below is in a timeout. The framed page can't communicate back mid-parse because that
+    // would involve running script, which makes that navigation "mature", and we need to do this
+    // before it matures.
+    test.step_timeout(() => {
+      child.document.querySelector("#javascriptUndefinedLink").click();
+      child.document.querySelector("iframe").onload = test.step_func_done(() => {
+        assert_true(child.childLoaded, 'child.childLoaded');
+      });
+    }, 100);
+  };
+});
+</script>
diff --git a/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-abort/support/iframe-and-links.html b/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-abort/support/iframe-and-links.html
new file mode 100644
index 00000000000000..545b0988ba919b
--- /dev/null
+++ b/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-abort/support/iframe-and-links.html
@@ -0,0 +1,18 @@
+<!doctype html>
+
+<iframe name="iframe"></iframe>
+
+<!-- slow link's response is delayed by 1 second -->
+<!-- https://wptserve.readthedocs.io/en/latest/pipes.html#trickle -->
+<a target="iframe" href="set-child-loaded.html?pipe=trickle(d1)" id="slowLink">slow link</a>
+<a target="iframe" href="javascript:'javascript:string <script> parent.javascriptStringDocLoaded(); </script>'" id="javascriptStringLink">javascript:string link</a>
+<a target="iframe" href="javascript:undefined" id="javascriptUndefinedLink">javascript:undefined link</a>
+
+<script>
+// set-child-loaded.html (the slow link) sets this to true.
+window.childLoaded = false;
+
+// Do nothing when the javascript:string doc has loaded, if it's correctly targeted to the above iframe.
+// However, if it replaces this document, it needs to fail the test (handled in the parent).
+function javascriptStringDocLoaded() {}
+</script>
diff --git a/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-abort/support/set-child-loaded.html b/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-abort/support/set-child-loaded.html
new file mode 100644
index 00000000000000..a4b34ad6e9d7b9
--- /dev/null
+++ b/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-abort/support/set-child-loaded.html
@@ -0,0 +1,5 @@
+<!doctype html>
+set-child-loaded.html
+<script>
+parent.childLoaded = true;
+</script>
