Run results for: ResizeObserver vs matchMedia

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; Redmi 8A Build/QKQ1.191014.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/103.0.5060.71 Mobile Safari/537.36

Browser: Chrome Mobile 103

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
ResizeObserver	289.9 Ops/sec
matchMedia	285.5 Ops/sec

HTML Preparation code:

<div>
  Hello
</div>

Tests:

ResizeObserver
let value; const observer = new ResizeObserver(entries => { value = entries[0].contentRect.width; }) observer.observe(document.body) for (let i = 500; i <= 1920; i++) { window.resizeTo(i, 1000) }
matchMedia
let value; const handleMatchChange = (val) => { value = val; } const match1 = window.matchMedia('screen and (min-width: 800px)') match1.addEventListener('change', handleMatchChange); const match2 = window.matchMedia('screen and (min-width: 480px)') match2.addEventListener('change', handleMatchChange); const match3 = window.matchMedia('screen and (min-width: 1200px)') match3.addEventListener('change', handleMatchChange); for (let i = 500; i <= 1920; i++) { window.resizeTo(i, 1000) }