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diff --git a/dom/events/test/pointerevents/mochitest_support_external.js b/dom/events/test/pointerevents/mochitest_support_external.js
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+++ b/dom/events/test/pointerevents/mochitest_support_external.js
@@ -0,0 +1,270 @@
+// This file supports translating W3C tests
+// to tests on auto MochiTest system with minimum changes.
+// Author: Maksim Lebedev <alessarik@gmail.com>
+
+// Function allows to prepare our tests after load document
+addEventListener(
+  "load",
+  function(event) {
+    console.log("OnLoad external document");
+    prepareTest();
+  },
+  false
+);
+
+// Function allows to initialize prerequisites before testing
+function prepareTest() {
+  SimpleTest.waitForExplicitFinish();
+  SimpleTest.requestCompleteLog();
+  startTest();
+}
+
+function setImplicitPointerCapture(capture, callback) {
+  console.log("SET dom.w3c_pointer_events.implicit_capture as " + capture);
+  SpecialPowers.pushPrefEnv(
+    {
+      set: [["dom.w3c_pointer_events.implicit_capture", capture]],
+    },
+    callback
+  );
+}
+
+var utils = SpecialPowers.Ci.nsIDOMWindowUtils;
+
+// Mouse Event Helper Object
+var MouseEventHelper = (function() {
+  return {
+    MOUSE_ID: utils.DEFAULT_MOUSE_POINTER_ID,
+    PEN_ID: utils.DEFAULT_PEN_POINTER_ID,
+    // State
+    // TODO: Separate this to support mouse and pen simultaneously.
+    BUTTONS_STATE: utils.MOUSE_BUTTONS_NO_BUTTON,
+
+    // Button
+    BUTTON_NONE: -1, // Used by test framework only. (replaced before sending)
+    BUTTON_LEFT: utils.MOUSE_BUTTON_LEFT_BUTTON,
+    BUTTON_MIDDLE: utils.MOUSE_BUTTON_MIDDLE_BUTTON,
+    BUTTON_RIGHT: utils.MOUSE_BUTTON_RIGHT_BUTTON,
+
+    // Buttons
+    BUTTONS_NONE: utils.MOUSE_BUTTONS_NO_BUTTON,
+    BUTTONS_LEFT: utils.MOUSE_BUTTONS_LEFT_BUTTON,
+    BUTTONS_MIDDLE: utils.MOUSE_BUTTONS_MIDDLE_BUTTON,
+    BUTTONS_RIGHT: utils.MOUSE_BUTTONS_RIGHT_BUTTON,
+    BUTTONS_4TH: utils.MOUSE_BUTTONS_4TH_BUTTON,
+    BUTTONS_5TH: utils.MOUSE_BUTTONS_5TH_BUTTON,
+
+    // Utils
+    computeButtonsMaskFromButton(aButton) {
+      // Since the range of button values is 0 ~ 2 (see nsIDOMWindowUtils.idl),
+      // we can use an array to find out the desired mask.
+      var mask = [
+        this.BUTTONS_NONE, // -1 (MouseEventHelper.BUTTON_NONE)
+        this.BUTTONS_LEFT, // 0
+        this.BUTTONS_MIDDLE, // 1
+        this.BUTTONS_RIGHT, // 2
+      ][aButton + 1];
+
+      ok(mask !== undefined, "Unrecognized button value caught!");
+      return mask;
+    },
+
+    checkExitState() {
+      ok(!this.BUTTONS_STATE, "Mismatched mousedown/mouseup caught.");
+    },
+  };
+})();
+
+function createMouseEvent(aEventType, aParams) {
+  var eventObj = { type: aEventType };
+
+  // Default to mouse.
+  eventObj.inputSource =
+    aParams && "inputSource" in aParams
+      ? aParams.inputSource
+      : MouseEvent.MOZ_SOURCE_MOUSE;
+  // Compute pointerId
+  eventObj.id =
+    eventObj.inputSource === MouseEvent.MOZ_SOURCE_MOUSE
+      ? MouseEventHelper.MOUSE_ID
+      : MouseEventHelper.PEN_ID;
+  // Check or generate a |button| value.
+  var isButtonEvent = aEventType === "mouseup" || aEventType === "mousedown";
+
+  // Set |button| to the default value first.
+  eventObj.button = isButtonEvent
+    ? MouseEventHelper.BUTTON_LEFT
+    : MouseEventHelper.BUTTON_NONE;
+
+  // |button| is passed, use and check it.
+  if (aParams && "button" in aParams) {
+    var hasButtonValue = aParams.button !== MouseEventHelper.BUTTON_NONE;
+    ok(
+      !isButtonEvent || hasButtonValue,
+      "Inappropriate |button| value caught."
+    );
+    eventObj.button = aParams.button;
+  }
+
+  // Generate a |buttons| value and update buttons state
+  var buttonsMask = MouseEventHelper.computeButtonsMaskFromButton(
+    eventObj.button
+  );
+  switch (aEventType) {
+    case "mousedown":
+      MouseEventHelper.BUTTONS_STATE |= buttonsMask; // Set button flag.
+      break;
+    case "mouseup":
+      MouseEventHelper.BUTTONS_STATE &= ~buttonsMask; // Clear button flag.
+      break;
+  }
+  eventObj.buttons = MouseEventHelper.BUTTONS_STATE;
+
+  // Replace the button value for mousemove events.
+  // Since in widget level design, even when no button is pressed at all, the
+  // value of WidgetMouseEvent.button is still 0, which is the same value as
+  // the one for mouse left button.
+  if (aEventType === "mousemove") {
+    eventObj.button = MouseEventHelper.BUTTON_LEFT;
+  }
+  return eventObj;
+}
+
+// Helper function to send MouseEvent with different parameters
+function sendMouseEvent(int_win, elemId, mouseEventType, params) {
+  var elem = int_win.document.getElementById(elemId);
+  if (elem) {
+    var rect = elem.getBoundingClientRect();
+    var eventObj = createMouseEvent(mouseEventType, params);
+
+    // Default to the center of the target element but we can still send to a
+    // position outside of the target element.
+    var offsetX =
+      params && "offsetX" in params ? params.offsetX : rect.width / 2;
+    var offsetY =
+      params && "offsetY" in params ? params.offsetY : rect.height / 2;
+
+    console.log(elemId, eventObj);
+    synthesizeMouse(elem, offsetX, offsetY, eventObj, int_win);
+  } else {
+    is(!!elem, true, "Document should have element with id: " + elemId);
+  }
+}
+
+// Helper function to send MouseEvent with position
+function sendMouseEventAtPoint(aWindow, aLeft, aTop, aMouseEventType, aParams) {
+  var eventObj = createMouseEvent(aMouseEventType, aParams);
+  console.log(eventObj);
+  synthesizeMouseAtPoint(aLeft, aTop, eventObj, aWindow);
+}
+
+// Touch Event Helper Object
+var TouchEventHelper = {
+  // State
+  TOUCH_ID: utils.DEFAULT_TOUCH_POINTER_ID,
+  TOUCH_STATE: false,
+
+  // Utils
+  checkExitState() {
+    ok(!this.TOUCH_STATE, "Mismatched touchstart/touchend caught.");
+  },
+};
+
+// Helper function to send TouchEvent with different parameters
+// TODO: Support multiple touch points to test more features such as
+// PointerEvent.isPrimary and pinch-zoom.
+function sendTouchEvent(int_win, elemId, touchEventType, params) {
+  var elem = int_win.document.getElementById(elemId);
+  if (elem) {
+    var rect = elem.getBoundingClientRect();
+    var eventObj = {
+      type: touchEventType,
+      id: TouchEventHelper.TOUCH_ID,
+    };
+
+    // Update touch state
+    switch (touchEventType) {
+      case "touchstart":
+        TouchEventHelper.TOUCH_STATE = true; // Set touch flag.
+        break;
+      case "touchend":
+      case "touchcancel":
+        TouchEventHelper.TOUCH_STATE = false; // Clear touch flag.
+        break;
+    }
+
+    // Default to the center of the target element but we can still send to a
+    // position outside of the target element.
+    var offsetX =
+      params && "offsetX" in params ? params.offsetX : rect.width / 2;
+    var offsetY =
+      params && "offsetY" in params ? params.offsetY : rect.height / 2;
+
+    console.log(elemId, eventObj);
+    synthesizeTouch(elem, offsetX, offsetY, eventObj, int_win);
+  } else {
+    is(!!elem, true, "Document should have element with id: " + elemId);
+  }
+}
+
+// Helper function to trigger drag and drop.
+async function doDragAndDrop(int_win, srcElemId, destElemId, params = {}) {
+  params.srcElement = int_win.document.getElementById(srcElemId);
+  params.destElement = int_win.document.getElementById(destElemId);
+  params.srcWindow = int_win;
+  params.destWindow = int_win;
+  params.id = MouseEventHelper.MOUSE_ID;
+  // This is basically for android which has a larger drag threshold.
+  params.stepY = params.stepY || 25;
+  await synthesizePlainDragAndDrop(params);
+}
+
+// Helper function to run Point Event test in a new tab.
+function runTestInNewWindow(aFile) {
+  var testURL =
+    location.href.substring(0, location.href.lastIndexOf("/") + 1) + aFile;
+  var testWindow = window.open(testURL, "_blank");
+  var testDone = false;
+
+  // We start testing when receiving load event. Inject the mochitest helper js
+  // to the test case after DOM elements are constructed and before the load
+  // event is fired.
+  testWindow.addEventListener(
+    "DOMContentLoaded",
+    function() {
+      var e = testWindow.document.createElement("script");
+      e.type = "text/javascript";
+      e.src =
+        "../".repeat(aFile.split("/").length - 1) +
+        "mochitest_support_internal.js";
+      testWindow.document.getElementsByTagName("head")[0].appendChild(e);
+    },
+    { once: true }
+  );
+
+  window.addEventListener("message", function(aEvent) {
+    switch (aEvent.data.type) {
+      case "START":
+        // Update constants
+        MouseEventHelper.MOUSE_ID = aEvent.data.message.mouseId;
+        MouseEventHelper.PEN_ID = aEvent.data.message.penId;
+        TouchEventHelper.TOUCH_ID = aEvent.data.message.touchId;
+
+        executeTest(testWindow);
+        return;
+      case "RESULT":
+        // Should not perform checking after SimpleTest.finish().
+        if (!testDone) {
+          ok(aEvent.data.result, aEvent.data.message);
+        }
+        return;
+      case "FIN":
+        testDone = true;
+        MouseEventHelper.checkExitState();
+        TouchEventHelper.checkExitState();
+        testWindow.close();
+        SimpleTest.finish();
+        return;
+    }
+  });
+}