Run results for: Declarative shadow dom

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36

Browser: Chrome 108

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
DOMParser code	9525.2 Ops/sec
AttachShadow	275315.9 Ops/sec

HTML Preparation code:

<div id="container"></div>

Tests:

DOMParser code
const prerendered = ` <div> <template shadowroot="open"> <p> Dynamically loaded shadow dom </p> <p> Dynamically loaded shadow dom </p> </template> </div> `; const elem = new DOMParser().parseFromString(prerendered, 'text/html', { includeShadowRoots: true}); document.getElementById('container').appendChild(...elem.body.children)
AttachShadow
const container = document.getElementById('container'); const elem = document.createElement('div'); const shadow = elem.attachShadow({mode: 'open'}); shadow.textContent = ` <p> Dynamically loaded shadow dom </p> <p> Dynamically loaded shadow dom </p> `; container.appendChild(elem);