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How to use test_render_blocking method in wpt

Best JavaScript code snippet using wpt

test-render-blocking.js

Source:test-render-blocking.js

...80}81// Error margin for comparing timestamps of paint and load events, in case they82// are reported by different threads.83const epsilon = 50;84function test_render_blocking(optionalElementOrUrl, finalTest, finalTestTitle) {85  // Ideally, we should observe the 'load' event on the specific render-blocking86  // elements. However, this is not possible for script-blocking stylesheets, so87  // we have to observe the 'load' event on 'window' instead.88  if (!(optionalElementOrUrl instanceof HTMLElement) &&89      typeof optionalElementOrUrl !== 'string') {90    finalTestTitle = finalTest;91    finalTest = optionalElementOrUrl;92    optionalElementOrUrl = undefined;93  }94  const loadObserver = new LoadObserver(optionalElementOrUrl || window);95  promise_test(async test => {96    assert_implements(window.PerformancePaintTiming);97    await test.step_wait(() => performance.getEntriesByType('paint').length);98    assert_true(loadObserver.finished);...

Using AI Code Generation

1}, function(err, data) {2  if (err) return console.error(err);3  console.log(data);4});5}, function(err, data) {6  if (err) return console.error(err);7  console.log(data);8});

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