Run results for: Declarative shadow dom

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/112.0

Browser: Firefox 112

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
DOMParser code	9151.8 Ops/sec
AttachShadow	169468.3 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);