| <!DOCTYPE html> |
| <meta name="viewport" content="width=device-width,initial-scale=1"> |
| <link rel="help" href="https://www.w3.org/TR/intersection-observer/#dom-intersectionobserver-scrollmargin"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="./resources/intersection-observer-test-utils.js"></script> |
| |
| <style> |
| #scroller { |
| width: 100px; |
| height: 100px; |
| overflow: hidden; |
| background-color: gray; |
| clip-path: inset(10%); |
| } |
| #spacer { width: 50px; height: 100px; } |
| #target { width: 50px; height: 50px; background-color: green; } |
| </style> |
| |
| <div id=scroller> |
| <div id=spacer></div> |
| <div id=target></div> |
| </div> |
| |
| <script> |
| let entries = []; |
| |
| window.onload = function() { |
| runTestCycle(testIntersection, "Test scroll margin intersection"); |
| |
| const observer = new IntersectionObserver( |
| es => entries = entries.concat(es), |
| { |
| scrollMargin: "20px" |
| } |
| ); |
| observer.observe(target); |
| }; |
| |
| function testIntersection() { |
| assert_equals(entries.length, 1, "IntersectionObserverEntryCount"); |
| assert_true(entries[0].isIntersecting, "isIntersecting"); |
| assert_approx_equals(entries[0].intersectionRatio, 0.2, 0.001, "intersectionRatio"); |
| } |
| </script> |