<!--your preparation HTML code goes here-->
const o = { f1(){}, f2: () => {}, f3: undefined}
o.f1()
o.f2()
o.f3?.()
FAQ: FAQ
Source code: GitHub/MeasureThat.net
Report issues: MeasureThat.net/Issues
Based on: Benchmark.js
Facebook page: https://www.facebook.com/MeasureThat.Net
Python benchmarks support: Pyodide