unload-manual.html (2511B)
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <title>time origin value manual test</title> 5 <link rel="help" href="https://w3c.github.io/hr-time/#time-origin-1"> 6 <link rel="prefetch" href="./resources/unload-a.html"> 7 <link rel="prefetch" href="./resources/unload-b.html"> 8 <link rel="prefetch" href="./resources/unload-c.html"> 9 </head> 10 <body> 11 <script src="/resources/testharness.js"></script> 12 <script src="/resources/testharnessreport.js"></script> 13 <script> 14 setup({ explicit_timeout: true }); 15 16 const ACCEPTABLE_VARIANCE = 400; // ms 17 18 const isRoughlyEqual = (a, b) => Math.abs(a - b) < ACCEPTABLE_VARIANCE; 19 20 const timings = { a: {}, b: {}, c: {} }; 21 const t = async_test("hr-time time origin"); 22 23 window.mark = msg => { 24 timings[msg.docName][msg.lifecycleEventName] = { 25 performanceNow: msg.performanceNow, 26 dateNow: msg.dateNow 27 }; 28 29 if (msg.docName === "c" && msg.lifecycleEventName === "unload") { 30 setTimeout(makeAssertions, 0); 31 } 32 }; 33 34 function makeAssertions () { 35 t.step(() => { 36 const loadTimeBetweenAandB = timings.b.load.dateNow - timings.a.unload.dateNow; 37 const loadTimeBetweenBandC = timings.c.load.dateNow - timings.b.unload.dateNow; 38 39 assert_true( 40 isRoughlyEqual(loadTimeBetweenAandB, timings.b.load.performanceNow), 41 "Document in reused window's time origin should be time of close of pop-up box." 42 ); 43 assert_true( 44 isRoughlyEqual(loadTimeBetweenBandC, timings.c.load.performanceNow), 45 "Document in reused window's time origin should be time of close of pop-up box." 46 ); 47 assert_true( 48 !isRoughlyEqual(timings.a.unload.performanceNow, 0), 49 "Time origin during unload event should match that of rest of document." 50 ); 51 assert_true( 52 !isRoughlyEqual(timings.b.unload.performanceNow, 0), 53 "Time origin during unload event should match that of rest of document." 54 ); 55 assert_true( 56 !isRoughlyEqual(timings.c.unload.performanceNow, 0), 57 "Time origin during unload event should match that of rest of document." 58 ); 59 }); 60 t.done(); 61 } 62 </script> 63 64 <h2>Description</h2> 65 <p>This test validates the behavior of <code>performance.now()</code> with respect to its time origin.</p> 66 <div id="log"> 67 <h2>Manual Test Steps</h2> 68 <ol> 69 <li><a href="resources/unload-a.html" target="_blank">Click here</a> 70 </ol> 71 </div> 72 </body> 73 <html>