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91 lines
3.2 KiB
HTML
91 lines
3.2 KiB
HTML
<!DOCTYPE html>
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<html>
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<meta charset=utf-8 />
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<title>Event Timing: buffer long-latency events before onload</title>
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<meta name="timeout" content="long">
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<button id='button' onmousedown='clickDelay()'>Generate a 'click' event</button>
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<script src=/resources/testharness.js></script>
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<script src=/resources/testharnessreport.js></script>
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<script src=/resources/testdriver.js></script>
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<script src=/resources/testdriver-vendor.js></script>
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<script src=resources/event-timing-test-utils.js></script>
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<img src=resources/slow-image.py>
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<script>
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let clickTimeMin;
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let processingStartMin;
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let onloadStart;
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let firstClickStart = 0;
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let firstClickEnd = 0;
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function clickDelay() {
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const onclickStart = performance.now();
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if (firstClickStart === 0)
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firstClickStart = onclickStart;
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while(performance.now() < onclickStart + 60) {}
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if (firstClickEnd === 0)
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firstClickEnd = performance.now();
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}
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function validateEntries() {
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const entries = performance.getEntriesByName('mousedown', 'event');
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const entriesBeforeOnload = entries.filter(
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e => e.startTime < onloadStart);
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assert_equals(entriesBeforeOnload.length, 1,
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"Long latency events before onload should be buffered.");
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const entry = entriesBeforeOnload[0];
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verifyClickEvent(entry, true);
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assert_greater_than_equal(entry.startTime, clickTimeMin,
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"The entry's start time should be later than clickTimeMin.");
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assert_greater_than_equal(entry.processingStart, processingStartMin,
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"The entry should be processed later than processingStartMin.");
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assert_less_than_equal(entry.processingStart, firstClickStart,
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"The processingStart must be before firstClickStart.")
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assert_greater_than_equal(entry.processingEnd, firstClickEnd,
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"The processingEnd must be after firstClickEnd.");
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const entriesAfterOnload = entries.filter(
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e => e.startTime >= onloadStart);
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assert_equals(entriesAfterOnload.length, 0,
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"Events after onload shouldn't be buffered.");
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}
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/* Timeline:
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Begin Busy Loop
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Click 1 arrives
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End Busy Loop
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(Dispatch and Process Click 1 - buffered)
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Onload Event Fires
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Begin Busy Loop
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Click 2 arrives
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End Busy Loop
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(Dispatch and Process Click 2 - not buffered)
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*/
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async_test(function(t) {
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clickTimeMin = performance.now();
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clickAndBlockMain('button');
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// Use a dummy observer to know when both clicks have been dispatched.
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const observerPromise = new Promise((resolve, reject) => {
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let entryCount = 0;
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new PerformanceObserver(entryList => {
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entryCount += entryList.getEntries().filter(
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entry => entry.name === 'mousedown').length;
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if (entryCount >= 2)
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resolve();
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}).observe({ entryTypes: ['event'] });
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});
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// Event handlers will be dispatched asynchronously, so this will be called
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// before processing begins.
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processingStartMin = performance.now();
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on_event(window, 'load', e => {
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onloadStart = performance.now();
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const clickPromise = clickAndBlockMain('button');
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Promise.all([observerPromise, clickPromise]).then(
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t.step_func_done(validateEntries));
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});
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}, "Event Timing: click, onload.");
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</script>
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</html>
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