Run results for: insertAdjacentHTML+textContent vs escape+insertAdjacentHTML

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.64 Safari/537.36 Edg/101.0.1210.53

Browser: Chrome 101

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
insertAdjacentHTML+textContent	141.2 Ops/sec
escape+insertAdjacentHTML	517.9 Ops/sec
insertAdjacentHTML+textContent w/ lastElementChild	145.8 Ops/sec

HTML Preparation code:


<div id='dest'></div>

Script Preparation code:

const dest = document.getElementById('dest');
function escapeHtml(unsafe)
{
    return unsafe
         .replace(/&/g, "&amp;")
         .replace(/</g, "&lt;")
         .replace(/>/g, "&gt;");
 }

Tests:

insertAdjacentHTML+textContent
dest.innerHTML = ""; for(var i=0; i<1000; ++i){ dest.insertAdjacentHTML("beforeend", ""); dest.lastChild.textContent = `Hello ${i} & hello again.`; }
escape+insertAdjacentHTML
var html = ""; for(var i=0; i<1000; ++i){ html += `${escapeHtml(`Hello ${i} & hello again.`)}`; } dest.innerHTML = html;
insertAdjacentHTML+textContent w/ lastElementChild
dest.innerHTML = ""; for(var i=0; i<1000; ++i){ dest.insertAdjacentHTML("beforeend", ""); dest.lastElementChild.textContent = `Hello ${i} & hello again.`; }

Run results for: insertAdjacentHTML+textContent vs escape+insertAdjacentHTML

insertAdjacentHTML+textContent

escape+insertAdjacentHTML

insertAdjacentHTML+textContent w/ lastElementChild