| <!doctype html> |
| <html> |
| <head> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| </head> |
| <body> |
| <script> |
| promise_test(async t => { |
| window.onload = () => { |
| // Trigger a long task. |
| const begin = window.performance.now(); |
| while (window.performance.now() < begin + 60); |
| }; |
| |
| assert_implements(window.PerformanceLongAnimationFrameTiming, 'Lon are not supported.'); |
| const entry = await new Promise(resolve => new PerformanceObserver( |
| t.step_func(entryList => { |
| const entries = entryList.getEntries(); |
| assert_greater_than_equal(entries.length, 1); |
| resolve(entries[0]); |
| })).observe({entryTypes: ["long-animation-frame"]})); |
| |
| assert_equals(typeof(entry.toJSON), 'function'); |
| const entryJSON = entry.toJSON(); |
| assert_equals(typeof(entryJSON), 'object'); |
| // Check attributes inheritted from PerformanceEntry. |
| const performanceEntryKeys = [ |
| 'name', |
| 'entryType', |
| 'startTime', |
| 'duration', |
| 'renderStart', |
| 'styleAndLayoutStart' |
| ]; |
| for (const key of performanceEntryKeys) { |
| assert_equals(entryJSON[key], entry[key], |
| `entry.toJSON().${key} should match entry.${key}`); |
| } |
| |
| }, 'Test toJSON() in PerformanceLongAnimationFrameTiming'); |
| </script> |
| </body> |
| </html> |
