diff --git a/dom/nodes/insertion-removing-steps/insertion-removing-steps-iframe.window.js b/dom/nodes/insertion-removing-steps/insertion-removing-steps-iframe.window.js
new file mode 100644
index 00000000000000..a10610f4677b15
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+++ b/dom/nodes/insertion-removing-steps/insertion-removing-steps-iframe.window.js
@@ -0,0 +1,147 @@
+// These tests ensure that:
+//   1. The HTML element insertion steps for iframes [1] run *after* all DOM
+//      insertion mutations associated with any given call to
+//      #concept-node-insert [2] (which may insert many elements at once).
+//      Consequently, a preceding element's insertion steps can observe the
+//      side-effects of later elements being connected to the DOM, but cannot
+//      observe the side-effects of the later element's own insertion steps [1],
+//      since insertion steps are run in order after all DOM insertion mutations
+//      are complete.
+//   2. The HTML element removing steps for iframes [3] *do not* synchronously
+//      run script during child navigable destruction. Therefore, script cannot
+//      observe the state of the DOM in the middle of iframe removal, even when
+//      multiple iframes are being removed in the same task. Iframe removal,
+//      from the perspective of the parent's DOM tree, is atomic.
+//
+// [1]: https://html.spec.whatwg.org/C#the-iframe-element:html-element-insertion-steps
+// [2]: https://dom.spec.whatwg.org/#concept-node-insert
+// [3]: https://html.spec.whatwg.org/C#the-iframe-element:html-element-removing-steps
+
+promise_test(async t => {
+  const fragment = new DocumentFragment();
+
+  const iframe1 = fragment.appendChild(document.createElement('iframe'));
+  const iframe2 = fragment.appendChild(document.createElement('iframe'));
+
+  t.add_cleanup(() => {
+    iframe1.remove();
+    iframe2.remove();
+  });
+
+  let iframe1Loaded = false, iframe2Loaded = false;
+  iframe1.onload = e => {
+    // iframe1 assertions:
+    iframe1Loaded = true;
+    assert_equals(window.frames.length, 1,
+        "iframe1 load event can observe its own participation in the frame " +
+        "tree");
+    assert_equals(iframe1.contentWindow, window.frames[0]);
+
+    // iframe2 assertions:
+    assert_false(iframe2Loaded,
+        "iframe2's load event hasn't fired before iframe1's");
+    assert_true(iframe2.isConnected,
+        "iframe1 can observe that iframe2 is connected to the DOM...");
+    assert_equals(iframe2.contentWindow, null,
+        "... but iframe1 cannot observe iframe2's contentWindow because " +
+        "iframe2's insertion steps have not been run yet");
+  };
+
+  iframe2.onload = e => {
+    iframe2Loaded = true;
+    assert_equals(window.frames.length, 2,
+        "iframe2 load event can observe its own participation in the frame tree");
+    assert_equals(iframe1.contentWindow, window.frames[0]);
+    assert_equals(iframe2.contentWindow, window.frames[1]);
+  };
+
+  // Synchronously consecutively adds both `iframe1` and `iframe2` to the DOM,
+  // invoking their insertion steps (and thus firing each of their `load`
+  // events) in order. `iframe1` will be able to observe itself in the DOM but
+  // not `iframe2`, and `iframe2` will be able to observe both itself and
+  // `iframe1`.
+  document.body.append(fragment);
+  assert_true(iframe1Loaded, "iframe1 loaded");
+  assert_true(iframe2Loaded, "iframe2 loaded");
+}, "Insertion steps: load event fires synchronously *after* iframe DOM " +
+   "insertion, as part of the iframe element's insertion steps");
+
+// There are several versions of the removal variant, since there are several
+// ways to remove multiple elements "at once". For example:
+//   1. `node.innerHTML = ''` ultimately runs
+//      https://dom.spec.whatwg.org/#concept-node-replace-all which removes all
+//      of a node's children.
+//   2. `node.replaceChildren()` which follows roughly the same path above.
+//   3. `node.remove()` on a parent of many children will invoke not the DOM
+//      remove algorithm, but rather the "removing steps" hook [1], for each
+//      child.
+//
+// [1]: https://dom.spec.whatwg.org/#concept-node-remove-ext
+
+function runRemovalTest(removal_method) {
+  promise_test(async t => {
+    const div = document.createElement('div');
+
+    const iframe1 = div.appendChild(document.createElement('iframe'));
+    const iframe2 = div.appendChild(document.createElement('iframe'));
+    document.body.append(div);
+
+    // Now that both iframes have been inserted into the DOM, we'll set up a
+    // MutationObserver that we'll use to ensure that multiple synchronous
+    // mutations (removals) are only observed atomically at the end. Specifically,
+    // the observer's callback is not invoked synchronously for each removal.
+    let observerCallbackInvoked = false;
+    const removalObserver = new MutationObserver(mutations => {
+      assert_false(observerCallbackInvoked,
+          "MO callback is only invoked once, not multiple times, i.e., for " +
+          "each removal");
+      observerCallbackInvoked = true;
+      assert_equals(mutations.length, 1, "Exactly one MutationRecord is recorded");
+      assert_equals(mutations[0].removedNodes.length, 2);
+      assert_equals(window.frames.length, 0,
+          "No iframe Windows exist when the MO callback is run");
+      assert_equals(document.querySelector('iframe'), null,
+          "No iframe elements are connected to the DOM when the MO callback is " +
+          "run");
+    });
+
+    removalObserver.observe(div, {childList: true});
+    t.add_cleanup(() => removalObserver.disconnect());
+
+    let iframe1UnloadFired = false, iframe2UnloadFired = false;
+    iframe1.contentWindow.addEventListener('unload', e => iframe1UnloadFired = true);
+    iframe2.contentWindow.addEventListener('unload', e => iframe2UnloadFired = true);
+
+    // Each `removal_method` will trigger the synchronous removal of each of
+    // `div`'s (iframe) children. This will synchronously, consecutively
+    // invoke HTML's "destroy a child navigable" (per [1]), for each iframe.
+    //
+    // [1]: https://html.spec.whatwg.org/C#the-iframe-element:destroy-a-child-navigable
+
+    if (removal_method === 'replaceChildren') {
+      div.replaceChildren();
+    } else if (removal_method === 'remove') {
+      div.remove();
+    } else if (removal_method === 'innerHTML') {
+      div.innerHTML = '';
+    }
+
+    assert_false(iframe1UnloadFired, "iframe1 unload did not fire");
+    assert_false(iframe2UnloadFired, "iframe2 unload did not fire");
+
+    assert_false(observerCallbackInvoked,
+        "MO callback is not invoked synchronously after removals");
+
+    // Wait one microtask.
+    await Promise.resolve();
+
+    if (removal_method !== 'remove') {
+      assert_true(observerCallbackInvoked,
+          "MO callback is invoked asynchronously after removals");
+    }
+  }, `Removing steps (${removal_method}): script does not run synchronously during iframe destruction`);
+}
+
+runRemovalTest('innerHTML');
+runRemovalTest('replaceChildren');
+runRemovalTest('remove');
diff --git a/dom/nodes/insertion-removing-steps/insertion-removing-steps-script.window.js b/dom/nodes/insertion-removing-steps/insertion-removing-steps-script.window.js
new file mode 100644
index 00000000000000..a1be3e1dd3e79a
--- /dev/null
+++ b/dom/nodes/insertion-removing-steps/insertion-removing-steps-script.window.js
@@ -0,0 +1,48 @@
+promise_test(async t => {
+  const fragmentWithTwoScripts = new DocumentFragment();
+  const script0 = document.createElement('script');
+  const script1 = fragmentWithTwoScripts.appendChild(document.createElement('script'));
+  const script2 = fragmentWithTwoScripts.appendChild(document.createElement('script'));
+
+  window.kBaselineNumberOfScripts = document.scripts.length;
+  assert_equals(document.scripts.length, kBaselineNumberOfScripts,
+      "The WPT infra starts out with exactly 3 scripts");
+
+  window.script0Executed = false;
+  script0.innerText = `
+    script0Executed = true;
+    assert_equals(document.scripts.length, kBaselineNumberOfScripts + 1,
+        'script0 can observe itself and no other scripts');
+  `;
+
+  window.script1Executed = false;
+  script1.innerText = `
+    script1Executed = true;
+    assert_equals(document.scripts.length, kBaselineNumberOfScripts + 2,
+        "script1 executes synchronously, and thus observes only itself and " +
+        "previous scripts");
+  `;
+
+  window.script2Executed = false;
+  script2.innerText = `
+    script2Executed = true;
+    assert_equals(document.scripts.length, kBaselineNumberOfScripts + 3,
+        "script2 executes synchronously, and thus observes itself and all " +
+        "previous scripts");
+  `;
+
+  assert_false(script0Executed, "Script0 does not execute before append()");
+  document.body.append(script0);
+  assert_true(script0Executed,
+      "Script0 executes synchronously during append()");
+
+  assert_false(script1Executed, "Script1 does not execute before append()");
+  assert_false(script2Executed, "Script2 does not execute before append()");
+  document.body.append(fragmentWithTwoScripts);
+  assert_true(script1Executed,
+      "Script1 executes synchronously during fragment append()");
+  assert_true(script2Executed,
+      "Script2 executes synchronously during fragment append()");
+}, "Script node insertion is not atomic with regard to execution. Each " +
+   "script is synchronously executed during the HTML element insertion " +
+   "steps hook");