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diff --git a/devtools/client/inspector/test/doc_inspector_remove-iframe-during-load.html b/devtools/client/inspector/test/doc_inspector_remove-iframe-during-load.html
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+++ b/devtools/client/inspector/test/doc_inspector_remove-iframe-during-load.html
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+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <title>iframe creation/deletion test</title>
+</head>
+<body>
+  <div id="yay"></div>
+  <script type="text/javascript">
+    "use strict";
+
+    var yay = document.querySelector("#yay");
+    yay.textContent = "nothing";
+
+    // Create a promise that the test can wait for.
+    let resolveReadyPromise;
+    window.readyPromise = new Promise(r => (resolveReadyPromise = r));
+
+    // Create/remove an iframe before load.
+    var iframe = document.createElement("iframe");
+    document.body.appendChild(iframe);
+    iframe.remove();
+    yay.textContent = "before events";
+
+    // Create/remove an iframe on DOMContentLoaded.
+    document.addEventListener("DOMContentLoaded", function() {
+      const newIframe = document.createElement("iframe");
+      document.body.appendChild(newIframe);
+      newIframe.remove();
+      yay.textContent = "DOMContentLoaded";
+    });
+
+    // Create/remove an iframe on window load.
+    window.addEventListener("load", function() {
+      const newIframe = document.createElement("iframe");
+      document.body.appendChild(newIframe);
+      newIframe.remove();
+      yay.textContent = "load";
+
+      resolveReadyPromise();
+    });
+  </script>
+</body>
+</html>