mark = performance.mark || noop;
window.performance.measure = performance.measure || noop;
if ("now" in window.performance === false) {
var nowOffset = Date.now();
if (performance.timing && performance.timing.navigationStart) {
nowOffset = performance.timing.navigationStart;
}
window.performance.now = function now() {
return Date.now() - nowOffset;
};
}
})();
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