pointerevent_touch-action-modified_touch.html

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This WPT test may be referenced by the following Test IDs:
- /pointerevents/pointerevent_touch-action-modified_touch.html - WPT Dashboard Interop Dashboard

<!doctype html>

<title>Deleting touch-action:none after pointerdown has no effect</title>

<link rel="help" href="https://w3c.github.io/pointerevents/#determining-supported-direct-manipulation-behavior" />

<meta name="viewport" content="width=device-width">

<link rel="stylesheet" type="text/css" href="pointerevent_styles.css">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/resources/testdriver.js"></script>

<script src="/resources/testdriver-actions.js"></script>

<script src="/resources/testdriver-vendor.js"></script>

<script src="pointerevent_support.js"></script>

<style>

  #target {

    width: 100px;

    height: 150vh;

    background-color: lightgreen;

    user-select: none;

  .touchActionNone {

    touch-action: none;

</style>

<body>

  <h1>Deleting touch-action:none after pointerdown has no effect</h1>

  <div id="target" class="touchActionNone" draggable="false">

    An unscrollable element that becomes scrollable at pointerdown.

  </div>

</body>

<script>

  "use strict";

  let target = document.getElementById("target");

  let pointercancel_received = false;

  document.body.addEventListener("pointerdown",

      () => target.classList.remove("touchActionNone"));

  document.body.addEventListener("pointercancel",

      () => pointercancel_received = true);

  promise_test(async () => {

    let pointerup_event = getEvent("pointerup", document.body);

    await touchScrollInTarget(target, "down");

    await pointerup_event;

    // Sanity-check: the class has been removed.

    assert_false(target.classList.contains("touchActionNone"));

    assert_false(pointercancel_received,

        "a pointercancel event is unexpected");

  }, "No scrolling after deleting touch-action:none after pointerdown");

</script>