How to use check_resolutions method in wpt

Best JavaScript code snippet using wpt

timing-attack.js

Source:timing-attack.js

...3  if (isolated) {4    resolution = 5;5  }6  test(function() {7    function check_resolutions(times, length) {8      const end = length - 2;9      // we compare each value with the following ones10      for (let i = 0; i < end; i++) {11        const h1 = times[i];12        for (let j = i+1; j < end; j++) {13          const h2 = times[j];14          const diff = h2 - h1;15          assert_true((diff === 0) || ((diff * 1000) >= resolution),16            "Differences smaller than ' + resolution + ' microseconds: " + diff);17        }18      }19      return true;20    }21    const times = new Array(10);22    let index = 0;23    let hrt1, hrt2, hrt;24    assert_equals(self.crossOriginIsolated, isolated, "Document cross-origin isolated value matches");25    // rapid firing of performance.now26    hrt1 = performance.now();27    hrt2 = performance.now();28    times[index++] = hrt1;29    times[index++] = hrt2;30    // ensure that we get performance.now() to return a different value31    do {32      hrt = performance.now();33      times[index++] = hrt;34    } while ((hrt - hrt1) === 0);35    assert_true(check_resolutions(times, index), 'Difference should be at least ' + resolution + ' microseconds.');36  }, 'The recommended minimum resolution of the Performance interface has been set to ' + resolution + ' microseconds for cross-origin isolated contexts.');...

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