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75 lines
3.2 KiB
HTML
75 lines
3.2 KiB
HTML
<!DOCTYPE html>
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<title>Nested left-constrained position:sticky elements should render correctly</title>
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<link rel="help" href="https://www.w3.org/TR/css-position-3/#sticky-pos" />
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<meta name="assert" content="This test checks that nested position:sticky elements with a left constraint render correctly" />
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="../resources/sticky-util.js"></script>
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<body></body>
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<script>
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test(() => {
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const elements = setupNestedStickyTest('left', 50, 60);
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elements.scroller.scrollLeft = 100;
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const nonStickyLeftX = elements.container.offsetLeft +
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elements.filler.clientWidth;
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assert_equals(elements.sticky.offsetLeft, nonStickyLeftX);
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// The inner sticky should not be offset from the outer.
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assert_equals(elements.innerSticky.offsetLeft, 0);
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}, 'before reaching the sticking point, neither sticky box should be offset');
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test(() => {
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const elements = setupNestedStickyTest('left', 50, 60);
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elements.scroller.scrollLeft = 145;
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const nonStickyLeftX = elements.container.offsetLeft +
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elements.filler.clientWidth;
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assert_equals(elements.sticky.offsetLeft, nonStickyLeftX);
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assert_equals(elements.innerSticky.offsetLeft, 5);
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}, 'the inner sticky can stick before the outer one if necessary');
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test(() => {
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const elements = setupNestedStickyTest('left', 50, 60);
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elements.scroller.scrollLeft = 200;
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// This math cancels to sticky.offsetLeft == (scroller.scrollLeft + 50), but
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// for clarity the calculations are left explicit.
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const nonStickyLeftX = elements.container.offsetLeft +
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elements.filler.clientWidth;
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const targetLeftX = elements.scroller.scrollLeft + 50;
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const stickyOffset = targetLeftX - nonStickyLeftX;
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assert_equals(elements.sticky.offsetLeft, nonStickyLeftX + stickyOffset);
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// The inner sticky has similar math, but its offsetLeft is relative to the
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// sticky element and in this test is the difference between the left values.
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assert_equals(elements.innerSticky.offsetLeft, 10);
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}, 'both sticky boxes can be stuck at the same time');
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test(() => {
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const elements = setupNestedStickyTest('left', 50, 60);
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elements.scroller.scrollLeft = 300;
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const maxOffsetInContainer = elements.container.offsetLeft +
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elements.container.clientWidth - elements.sticky.clientWidth;
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assert_equals(elements.sticky.offsetLeft, maxOffsetInContainer);
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const maxOffsetInOuterSticky = elements.sticky.clientWidth -
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elements.innerSticky.clientWidth;
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assert_equals(elements.innerSticky.offsetLeft, maxOffsetInOuterSticky);
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}, 'neither sticky can escape their containing block');
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test(() => {
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const elements = setupNestedStickyTest('left', 50, 300);
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elements.scroller.scrollLeft = 100;
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// The outer sticky has not stuck yet.
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const nonStickyLeftX = elements.container.offsetLeft +
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elements.filler.clientWidth;
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assert_equals(elements.sticky.offsetLeft, nonStickyLeftX);
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// But the inner sticky still cannot escape the outer sticky (as it is the
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// containing block).
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const maxOffsetInOuterSticky = elements.sticky.clientWidth -
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elements.innerSticky.clientWidth;
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assert_equals(elements.innerSticky.offsetLeft, maxOffsetInOuterSticky);
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}, 'the inner sticky cannot be pushed outside the outer sticky');
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</script>
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