scroll-margin-not-contained.html (1221B)
1 <!DOCTYPE html> 2 <meta name="viewport" content="width=device-width,initial-scale=1"> 3 <link rel="help" href="https://www.w3.org/TR/intersection-observer/#dom-intersectionobserver-scrollmargin"> 4 <script src="/resources/testharness.js"></script> 5 <script src="/resources/testharnessreport.js"></script> 6 <script src="./resources/intersection-observer-test-utils.js"></script> 7 8 <style> 9 #scroller { width: 100px; height: 100px; overflow: hidden; background-color: gray; position: absolute; } 10 #target { width: 50px; height: 50px; background-color: green; } 11 </style> 12 13 <div id=root> 14 <div id=scroller> 15 <div id=target></div> 16 </div> 17 </div> 18 19 <script> 20 let entries = []; 21 22 window.onload = function() { 23 runTestCycle(testIntersection, "Test scroll margin intersection"); 24 25 const observer = new IntersectionObserver( 26 es => entries = entries.concat(es), 27 { 28 root: document.querySelector("#root"), 29 scrollMargin: "10px" 30 } 31 ); 32 observer.observe(target); 33 }; 34 35 function testIntersection() { 36 assert_equals(entries.length, 1, "IntersectionObserverEntryCount"); 37 // Not insecting because root is not in the containing block chain of target. 38 assert_false(entries[0].isIntersecting, "isIntersecting"); 39 } 40 </script>