frame_visibility_in_iframe.html (2042B)
1 <!DOCTYPE HTML> 2 <html> 3 <head> 4 <meta charset="utf-8"> 5 <title>Video element visibility in iframe</title> 6 </head> 7 <body> 8 <div style="width: 100%; height: calc(100vh - 100px);"></div> 9 <div style="height: 100px; overflow: scroll;"> 10 <!-- Must be larger than the IntersectionObserver margin used in DOMIntersectionObserver::ComputeInputForIframeThrottling --> 11 <div style="width: 100%; height: 800px;"></div> 12 <iframe id="iframe" style="height: 100px; border: none;"></iframe> 13 </div> 14 <script> 15 const add_task = window.opener.add_task; 16 const SimpleTest = window.opener.SimpleTest; 17 const original_finish = window.opener.SimpleTest.finish; 18 19 // add_task calls SimpleTest.finish() when it finished, we want to close this 20 // window before SimpleTest.finish() gets called. 21 SimpleTest.finish = function finish() { 22 self.close(); 23 original_finish(); 24 } 25 26 add_task(async () => { 27 const iframe = document.getElementById("iframe"); 28 await new Promise(resolve => { 29 iframe.addEventListener("load", () => { resolve(); }, { once: true }); 30 iframe.src = "http://example.org/tests/layout/generic/test/frame_visibility_in_iframe_child.html"; 31 }); 32 33 await SpecialPowers.spawn(iframe, [], async () => { 34 // With layout.visibility.min-recompute-interval-ms=0 value, flushing layout 35 // and waiting two frames would be sufficient to make sure at least one 36 // RebuildApproximateFrameVisibility call was done. This would avoid the 37 // situation we consider the video element is invisible without doing any 38 // frame visibility tracking stuff. 39 content.document.documentElement.getBoundingClientRect(); 40 await new Promise(resolve => content.window.requestAnimationFrame(resolve)); 41 await new Promise(resolve => content.window.requestAnimationFrame(resolve)); 42 }); 43 44 await SpecialPowers.spawn(iframe, [], async () => { 45 const video = content.document.querySelector("video"); 46 Assert.ok(!SpecialPowers.wrap(video).isInViewPort, 47 "The video element should not be in the viewport"); 48 }); 49 }); 50 </script> 51 </body> 52 </html>