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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
| commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
| tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /dom/tests/mochitest/general/test_performance_now.html | |
| parent | Initial commit. (diff) | |
| download | firefox-esr-upstream.tar.xz firefox-esr-upstream.zip | |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'dom/tests/mochitest/general/test_performance_now.html')
| -rw-r--r-- | dom/tests/mochitest/general/test_performance_now.html | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/dom/tests/mochitest/general/test_performance_now.html b/dom/tests/mochitest/general/test_performance_now.html new file mode 100644 index 0000000000..23f5f45969 --- /dev/null +++ b/dom/tests/mochitest/general/test_performance_now.html @@ -0,0 +1,60 @@ +<!DOCTYPE HTML> +<html> +<head> + <title>Test for High Resolution Timer</title> + <script type="text/javascript" src="/MochiKit/MochiKit.js"></script> + <script src="/tests/SimpleTest/SimpleTest.js"></script> + <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" /> +</head> +<body> + <script> + ok(window.performance, "Performance object should exist."); + ok(typeof window.performance.now == 'function', "Performance object should have a 'now' method."); + var n = window.performance.now(), d = Date.now(); + ok(n >= 0, "The value of now() should be equal to or greater than 0."); + ok(window.performance.now() >= n, "The value of now() should monotonically increase."); + + SimpleTest.waitForExplicitFinish(); + SimpleTest.requestFlakyTimeout("using setTimeout() to measure performance.now()"); + + // Spin on setTimeout() until performance.now() increases. Due to recent + // security developments, the hr-time working group has not yet reached + // consensus on what the recommend minimum clock resolution should be: + // https://w3c.github.io/hr-time/#clock-resolution + // Since setTimeout might return too early/late, our goal is for + // performance.now() to increase before a 2 ms deadline rather than specific + // number of setTimeout(N) invocations. + // See bug 749894 (intermittent failures of this test) + var checks = 0; + + function checkAfterTimeout() { + checks++; + var d2 = Date.now(); + var n2 = window.performance.now(); + + // Spin on setTimeout() until performance.now() increases. Abort the + // test if it runs for more than 2 ms or 50 timeouts. + let elapsedTime = d2 - d; + let elapsedPerf = n2 - n; + if (elapsedPerf == 0 && elapsedTime < 2 && checks < 50) { + setTimeout(checkAfterTimeout, 1); + return; + } + + // Our implementation provides 1 ms resolution (bug 1451790). + ok(elapsedPerf >= 1, + `Loose - the value of now() should increase by no less than 1 ms ` + + `after 2 ms. delta now(): ${elapsedPerf} ms`); + + // If we need more than 1 iteration, then either performance.now() + // resolution is shorter than 1 ms or setTimeout() is returning too early. + ok(checks == 1, + `Strict - the value of now() should increase after one setTimeout. ` + + `iters: ${checks}, dt: ${elapsedTime}, now(): ${n2}`); + + SimpleTest.finish(); + }; + setTimeout(checkAfterTimeout, 1); + </script> +</body> +</html> |