Run results for: Remove all children from DOM element-1a

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_3_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.3.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.3.2

Device Platform: Mobile

Date tested: one month ago

Test name	Executions per second
Remove firstChild	54408124.0 Ops/sec
Remove lastChild	53011856.0 Ops/sec
firstChild.remove	50049908.0 Ops/sec
lastChild.remove	51747116.0 Ops/sec
replaceChildren	15393185.0 Ops/sec

HTML Preparation code:

<div id='messages'></div>

Script Preparation code:

const html = [];
for(i=0; i<1000; i++) {
	html.push("<span>Text</span>");
}
document.getElementById("messages").insertAdjacentHTML('beforeend', html)

Tests:

Remove firstChild
let list = document.getElementById("messages"); while (list.firstChild) { list.removeChild(list.firstChild); }
Remove lastChild
let list = document.getElementById("messages"); while (list.lastChild) { list.removeChild(list.lastChild); }
firstChild.remove
let list = document.getElementById("messages"); while (list.firstChild) { list.firstChild.remove(); }
lastChild.remove
let list = document.getElementById("messages"); while (list.lastChild) { list.lastChild.remove(); }
replaceChildren
let list = document.getElementById("messages"); list.replaceChildren();

Run results for: Remove all children from DOM element-1a

Remove firstChild

Remove lastChild

firstChild.remove

lastChild.remove

replaceChildren