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diff --git a/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/inert-svg-hittest.html b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/inert-svg-hittest.html
new file mode 100644
index 0000000000..579aca7775
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/inert-svg-hittest.html
@@ -0,0 +1,68 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Hit-testing with SVG made inert by modal dialog</title>
+<link rel="author" title="Tim Nguyen" href="https://github.com/nt1m">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/interaction.html#inert">
+<meta assert="assert" content="SVG made inert by modal dialog should be unreachable with hit-testing">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+
+<div id="wrapper">
+    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 500 500">
+        <rect width="500" height="500" id="target" fill="red">
+    </svg>
+</div>
+
+<dialog id="dialog">Content behind the open modal dialog should not be clickable</dialog>
+
+<style>
+dialog::backdrop {
+    display: none;
+}
+</style>
+
+<script>
+const dialog = document.getElementById("dialog");
+const wrapper = document.getElementById("wrapper");
+const target = document.getElementById("target");
+
+promise_test(async function() {
+    dialog.showModal();
+    this.add_cleanup(() => dialog.close());
+
+    let reachedTarget = false;
+    target.addEventListener("mousedown", () => {
+        reachedTarget = true;
+    }, { once: true });
+
+    let wrapperRect = wrapper.getBoundingClientRect();
+    await new test_driver.Actions()
+        .pointerMove(wrapperRect.x + 1, wrapperRect.y + 1, { origin: "viewport" })
+        .pointerDown()
+        .send();
+
+    assert_false(target.matches(":active"), "target is not active");
+    assert_false(target.matches(":hover"), "target is not hovered");
+    assert_false(reachedTarget, "target didn't get event");
+}, "Hit-testing doesn't reach contents of an inert SVG");
+
+promise_test(async function() {
+    assert_false(dialog.open, "dialog is closed");
+
+    let reachedTarget = false;
+    target.addEventListener("mousedown", () => {
+        reachedTarget = true;
+    }, { once: true });
+
+    await new test_driver.Actions()
+        .pointerMove(0, 0, { origin: wrapper })
+        .pointerDown()
+        .send();
+
+    assert_true(target.matches(":active"), "target is active");
+    assert_true(reachedTarget, "target got event");
+}, "Hit-testing can reach contents of a no longer inert SVG");
+</script>