position-sticky-bottom.html

Enable keyboard shortcuts

This WPT test may be referenced by the following Test IDs:
- /css/css-position/sticky/position-sticky-bottom.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>position:sticky elements should respect the bottom constraint</title>

<link rel="help" href="https://www.w3.org/TR/css-position-3/#sticky-pos" />

<meta name="assert" content="This test checks that position:sticky elements obey their bottom anchor after scrolling" />

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

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

<script src="../resources/sticky-util.js"></script>

<body></body>

<script>

test(() => {

  const elements = setupStickyTest('bottom', 25);

  elements.scroller.scrollTop = 300;

  const nonStickyTopY = elements.container.offsetTop +

      elements.filler.clientHeight;

  assert_equals(elements.sticky.offsetTop, nonStickyTopY);

}, 'before reaching the sticking point the sticky box should not be offset');

test(() => {

  const elements = setupStickyTest('bottom', 25);

  elements.scroller.scrollTop = 100;

  const nonStickyTopY = elements.container.offsetTop +

      elements.filler.clientHeight;

  const nonStickyBottomY = nonStickyTopY + elements.sticky.clientHeight;

  const targetBottomY = elements.scroller.clientHeight +

      elements.scroller.scrollTop - 25;

  const stickyOffset = nonStickyBottomY - targetBottomY;

  assert_equals(elements.sticky.offsetTop, nonStickyTopY - stickyOffset);

}, 'after reaching the sticking point the sticky box should be offset');

test(() => {

  const elements = setupStickyTest('bottom', 25);

  elements.scroller.scrollTop = 0;

  assert_equals(elements.sticky.offsetTop, elements.container.offsetTop);

}, 'the sticky box should not be pushed outside its containing block');

</script>