| <!DOCTYPE html> |
| <title>position:sticky elements should respect the right 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 right 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('right', 25); |
| elements.scroller.scrollLeft = 200; |
| const nonStickyLeftX = elements.container.offsetLeft + |
| elements.filler.clientWidth; |
| assert_equals(elements.sticky.offsetLeft, nonStickyLeftX); |
| }, 'before reaching the sticking point the sticky box should not be offset'); |
| |
| test(() => { |
| const elements = setupStickyTest('right', 25); |
| elements.scroller.scrollLeft = 75; |
| |
| const nonStickyLeftX = elements.container.offsetLeft + |
| elements.filler.clientWidth; |
| const nonStickyRightX = nonStickyLeftX + elements.sticky.clientWidth; |
| const targetRightX = elements.scroller.clientWidth + |
| elements.scroller.scrollLeft - 25; |
| const stickyOffset = nonStickyRightX - targetRightX; |
| |
| assert_equals(elements.sticky.offsetLeft, nonStickyLeftX - stickyOffset); |
| }, 'after reaching the sticking point the sticky box should be offset'); |
| |
| test(() => { |
| const elements = setupStickyTest('right', 25); |
| elements.scroller.scrollLeft = 15; |
| assert_equals(elements.sticky.offsetLeft, elements.container.offsetLeft); |
| }, 'the sticky box should not be pushed outside its containing block'); |
| </script> |
