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diff --git a/dom/events/test/test_bug1710509.html b/dom/events/test/test_bug1710509.html
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+++ b/dom/events/test/test_bug1710509.html
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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Bug 1710509</title>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script src="/tests/gfx/layers/apz/test/mochitest/apz_test_utils.js"></script>
+<script src="/tests/gfx/layers/apz/test/mochitest/apz_test_native_event_utils.js"></script>
+<link rel="stylesheet" href="/tests/SimpleTest/test.css" />
+
+<style>
+  #container {
+    width: 100px;
+    height: 100px;
+    touch-action: none;
+  }
+</style>
+
+<div id="container"></div>
+
+<script>
+  /**
+   * @template {keyof HTMLElementEventMap} K
+   * @param {HTMLElemnt} target
+   * @param {K} eventName
+   * @return {HTMLElementEventMap[K]}
+   */
+  function waitForEvent(target, eventName) {
+    return new Promise(resolve => {
+      target.addEventListener(eventName, resolve, { once: true });
+    });
+  }
+
+  add_task(async function testPenDrag() {
+    await SpecialPowers.pushPrefEnv({
+      set: [
+        ["dom.w3c_pointer_events.dispatch_by_pointer_messages", false],
+      ],
+    });
+
+    await SimpleTest.promiseFocus();
+    const container = document.getElementById("container");
+    const touchMovePromise = waitForEvent(container, "touchmove");
+    await promiseNativePointerDrag(container, "pen", 50, 50, -50, -50);
+
+    const touchmove = await touchMovePromise;
+    const [touch] = touchmove.touches;
+    is(touch.radiusX, 1, ".radiusX");
+    is(touch.radiusY, 1, ".radiusX");
+  });
+</script>