dom/events/test/test_deltaMode_lines_always_enabled.html

   1 <!DOCTYPE html>
   2 <meta charset="utf-8">
   3 <title>Test for always-enabling lines deltaMode</title>
   4 <script src="/tests/SimpleTest/SimpleTest.js"></script>
   5 <script src="/tests/SimpleTest/EventUtils.js"></script>
   6 <link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
   7 <p id="display"></p>
   8 <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1684001">Mozilla Bug 1684001</a>
   9 <div id="overflow" style="height: 300vh"></div>
  10 <pre id="test"></pre>
  11 <script>
  12 SimpleTest.waitForExplicitFinish();
  13
  14 const HACK_PREF = "dom.event.wheel-deltaMode-lines.always-enabled";
  15
  16 (async function() {
  17   await SimpleTest.promiseFocus(window);
  18   await SpecialPowers.pushPrefEnv({
  19     set: [
  20       [HACK_PREF, document.domain],
  21       ["test.events.async.enabled", true],
  22     ],
  23   });
  24   // FYI: Cannot use scrollingElement because it's center may be outside of the viewport.
  25   await promiseElementReadyForUserInput(document.querySelector("a[href]"));
  26   await SpecialPowers.pushPrefEnv({
  27     clear: [
  28       ["test.events.async.enabled"],
  29     ],
  30   });
  31
  32   document.addEventListener("wheel", e => {
  33     e.deltaY; /* access the delta unchecked */
  34     is(e.deltaMode, WheelEvent.DOM_DELTA_LINE, "Accessing wheel event data should return lines even if unchecked, if the pref is enabled for that domain");
  35     SimpleTest.finish();
  36   }, { once: true });
  37
  38   synthesizeWheel(document.scrollingElement, 10, 10, { deltaY: 3.0, deltaMode: WheelEvent.DOM_DELTA_LINE });
  39 }());
  40 </script>