test_scroll_position_restore_no_bfcache.html

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<!doctype html>

<meta charset="utf-8">

<title>Test for Bug 1269539</title>

<script src="/tests/SimpleTest/SimpleTest.js"></script>

<script src="/tests/SimpleTest/paint_listener.js"></script>

<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>

<script>

SimpleTest.waitForExplicitFinish();

let loadCount = 0;

let childWin;

let targetScrollPosition;

function handlePageShow(persisted) {

  ok(typeof persisted == "boolean", "Should get the persisted state from the pageshow event");

  ok(!persisted, "Shouldn't have gotten into the bfcache");

  is(childWin.getComputedStyle(childWin.document.body).color, "rgb(0, 255, 0)", "Sheet should have been applied");

  let scroller = childWin.document.querySelector("#scroll");

  if (loadCount == 0) {

    loadCount++;

    targetScrollPosition = childWin.innerHeight;

    isnot(targetScrollPosition, 0, "Should scroll somewhere");

    scroller.scrollTo(0, childWin.innerHeight);

    childWin.requestAnimationFrame(() => childWin.requestAnimationFrame(() => {

      childWin.location.reload();

    }));

  } else {

    childWin.requestAnimationFrame(() => childWin.requestAnimationFrame(() => {

      // Verify that the scroll position was retained

      is(scroller.scrollTop, targetScrollPosition, "Should have restored the scroll position");

      childWin.close();

      SimpleTest.finish();

    }));

SpecialPowers.pushPrefEnv({

  set: [ ["layout.disable-pixel-alignment", true] ]

}).then(() => {

  childWin = window.open('file_scroll_position_restore_no_bfcache.html', '_blank');

});

</script>