visibility-hidden.html (1650B)
1 <!DOCTYPE html> 2 <meta name="viewport" content="width=device-width,initial-scale=1"> 3 <script src="/resources/testharness.js"></script> 4 <script src="/resources/testharnessreport.js"></script> 5 <script src="./resources/intersection-observer-test-utils.js"></script> 6 7 <style> 8 body { 9 margin: 0; 10 } 11 pre, #log { 12 position: absolute; 13 top: 0; 14 left: 200px; 15 } 16 .spacer { 17 height: calc(100vh + 100px); 18 } 19 #target { 20 width: 100px; 21 height: 100px; 22 visibility: hidden; 23 } 24 </style> 25 26 <div class="spacer"></div> 27 <div id="target"></div> 28 <div class="spacer"></div> 29 30 <script> 31 var vw = document.documentElement.clientWidth; 32 var vh = document.documentElement.clientHeight; 33 var entries = []; 34 35 runTestCycle(function() { 36 target = document.getElementById("target"); 37 assert_true(!!target, "target exists"); 38 var observer = new IntersectionObserver(function(changes) { 39 entries = entries.concat(changes) 40 }); 41 observer.observe(target); 42 entries = entries.concat(observer.takeRecords()); 43 assert_equals(entries.length, 0, "No initial notifications."); 44 runTestCycle(step0, "First rAF."); 45 }, "IntersectionObserver observing a visibility:hidden element."); 46 47 function step0() { 48 document.scrollingElement.scrollTop = 300; 49 runTestCycle(step1, "document.scrollingElement.scrollTop = 300"); 50 // The numbers in brackets are target client rect; intersection rect; 51 // and root bounds. 52 checkLastEntry(entries, 0, [0, 100, vh + 100, vh + 200, 0, 0, 0, 0, 0, vw, 0, vh, false]); 53 } 54 55 function step1() { 56 document.scrollingElement.scrollTop = 0; 57 checkLastEntry(entries, 1, [0, 100, vh - 200, vh - 100, 0, 100, vh - 200, vh - 100, 0, vw, 0, vh, true]); 58 } 59 </script>