position-sticky-nested-right.html

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

<!DOCTYPE html>

<title>Nested right-constrained position:sticky elements should render correctly</title>

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

<meta name="assert" content="This test checks that nested position:sticky elements with a right constraint render correctly" />

<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 = setupNestedStickyTest('right', 25, 35);

  elements.scroller.scrollLeft = 200;

  const nonStickyLeftX = elements.container.offsetLeft +

      elements.filler.clientWidth;

  assert_equals(elements.sticky.offsetLeft, nonStickyLeftX);

  // The inner sticky should not be offset from the outer.

  const nonStickyInnerLeftX = elements.sticky.clientWidth -

      elements.innerSticky.clientWidth;

  assert_equals(elements.innerSticky.offsetLeft, nonStickyInnerLeftX);

}, 'before reaching the sticking point, neither sticky box should be offset');

test(() => {

  const elements = setupNestedStickyTest('right', 25, 50);

  elements.scroller.scrollLeft = 150;

  const nonStickyLeftX = elements.container.offsetLeft +

      elements.filler.clientWidth;

  assert_equals(elements.sticky.offsetLeft, nonStickyLeftX);

  assert_equals(elements.innerSticky.offsetLeft, 50);

}, 'the inner sticky can stick before the outer one if necessary');

test(() => {

  const elements = setupNestedStickyTest('right', 25, 35);

  elements.scroller.scrollLeft = 100;

  const nonStickyLeftX = elements.container.offsetLeft +

      elements.filler.clientWidth;

  const nonStickyBottomX = nonStickyLeftX + elements.sticky.clientWidth;

  const targetBottomX = elements.scroller.clientWidth +

      elements.scroller.scrollLeft - 25;

  const stickyOffset = nonStickyBottomX - targetBottomX;

  assert_equals(elements.sticky.offsetLeft, nonStickyLeftX - stickyOffset);

  // The inner sticky has similar math, but its offsetLeft is relative to the

  // sticky element and in this test is (height - the difference between the

  // top values).

  assert_equals(elements.innerSticky.offsetLeft, 40);

}, 'both sticky boxes can be stuck at the same time');

test(() => {

  const elements = setupNestedStickyTest('right', 25, 100);

  elements.scroller.scrollLeft = 0;

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

  assert_equals(elements.innerSticky.offsetLeft, 0);

}, 'neither sticky can escape their containing block');

test(() => {

  const elements = setupNestedStickyTest('right', 25, 500);

  elements.scroller.scrollLeft = 200;

  // It doesn't matter how big the inner sticky offset is, it cannot escape its

  // containing block (the outer sticky).

  assert_equals(elements.innerSticky.offsetLeft, 0);

}, 'the inner sticky cannot be pushed outside the outer sticky');

</script>