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Browser support

u-elements is committed to provide great support for all users and technologies, including older browser versions.

Based on up-to-date statistics from caniuse.com, u-elements currently support 99.34% of all users on Chrome, Edge, Firefox, Firefox for Android, Opera, Safari, Safari on iOS, and Samsung Internet.

Minimum requirements

Browser versionRelease date
Chrome 54+October 2016
Edge 79+January 2020
Firefox 63+October 2018
Firefox for Android 140+June 2025
Opera 41+October 2016
Safari 10.1+March 2017
Safari on iOS 10.3+March 2017
Samsung Internet 6.2+October 2017

Web features in use

u-elements tracks browser support by monitoring the web features it uses. This is done by analyzing source code with JSHint and cross-referencing the identified features against MDN Browser Compatibility Data and caniuse.com usage statistics. Here are the web features used by u-elements that are not yet fully supported by all browsers:

FeatureBrowser support
Window.customElements 99.34%
:host 99.34%
:host() 99.34%
Node.getRootNode 99.35%
ShadowRoot.mode 99.36%
Element.attachShadow 99.36%
ShadowRoot.activeElement 99.36%
Element.slot 99.36%
Event.composed 99.45%
Node.isConnected 99.49%
Object.entries 99.51%
Element.append 99.51%
Element.prepend 99.51%
KeyboardEvent.key 99.60%
Element.shadowRoot 99.65%
Array.includes 99.74%
Array.from 99.78%
Array.of 99.78%
Object.assign 99.78%
Array.find 99.78%
Array.findIndex 99.78%
:scope 99.80%
Event.isTrusted 99.82%
KeyboardEvent.repeat 99.84%
String.repeat 99.85%
String.endsWith 99.85%
Element.closest 99.85%
String.startsWith 99.85%
Object.getOwnPropertySymbols 99.88%
Array.keys 99.88%
Number.isNaN 99.88%
Number.parseFloat 99.88%
Number.isFinite 99.88%
Element.insertAdjacentElement 99.88%
Element.remove 99.89%
HTMLElement.innerText 99.89%

Released under the MIT License