browsertime/browserscripts/timings/paintTiming.js

Get performance metrics from your web page using Browsertime.

(function() {
  let p = window.performance,
    entries,
    values = {};

  entries = p.getEntriesByType('paint');

  if (entries.length > 0) {
    for (const entry of entries) {
      values[entry.name] = Number(entry.startTime.toFixed(0));
    }
    return values;
  } else return undefined;
})();