Browser Compatibility

XCover Elements (XCE) requires modern browser features to deliver a robust web component experience. This page provides a comprehensive reference for browser compatibility requirements and supported platforms.

Global Coverage: 93% of worldwide browser usage is supported.

Methodology & Sources

Browser compatibility data is derived from authoritative sources and feature-level checks:

• Can I use - Support tables for HTML5, CSS3, and modern web features
• MDN Web Docs - Comprehensive browser compatibility documentation
• WebKit Release Notes - Safari-specific feature tracking

Where possible, compatibility is determined through feature-level checks rather than browser versions alone. Key features monitored include:

• fetch API
• Custom Elements (Web Components)
• Shadow DOM
• CSS Nesting
• ES2022+ JavaScript features

Required Browser Features

XCover Elements depends on the following modern web platform features:

Feature	Usage in XCE	Browsers Lacking Support
Custom Elements & Shadow DOM	Core architecture for encapsulated UI components and custom elements	IE (all versions), Opera Mini, older Android browsers, UC Browser
CSS Nesting	CSS Modules with nested selectors for concise, modular component styling	Safari < 17, older Firefox versions, legacy mobile browsers
Numeric Separators & Logical Assignment	Cleaner numeric literals and compact syntax (ES2022)	Browsers without ES2022 support
Optional Chaining & Nullish Coalescing	Helper functions and optional prop handling (ES2020)	Very old browsers pre-ES2020
CSS Container Queries	Responsive component behavior without media query boilerplate	Not fully supported in older browsers
ES Modules Dynamic Import	Code splitting and lazy loading for optimized bundle sizes	IE, legacy browsers

Supported Browsers

Desktop Browsers

Browser	Minimum Version	Release Date	Notes
Chrome	120+	November 2023	Recommended browser
Mozilla Firefox	117+	August 2023	Full feature support
Safari	17+	September 2023	macOS and iOS
Microsoft Edge	120+	November 2023	Chromium-based
Opera	106+	November 2023	Chromium-based
Brave	1.61+	November 2023	Chromium-based
Vivaldi	Chromium 120+	2023+	Chromium-based
Arc Browser	Chromium 120+	2023+	Chromium-based
DuckDuckGo Browser	Chromium 120+	2023	Chromium-based
Yandex Browser	Chromium 120+	2023+	Chromium-based
SRWare Iron	Chromium 120+	2023+	Chromium-based

Regional & Specialized Browsers

Browser	Minimum Version	Release Date	Notes
ChatGPT Atlas	Chromium 120+	October 2025	Chromium-based, macOS only
Samsung Internet	Latest stable	-	Chromium-based
QQ Browser (Tencent)	Chromium 120+	-	Chromium-based
Baidu Browser	Chromium 120+	-	Chromium-based

Mobile Browsers

Platform	Browser	Minimum Version	Support Level
iOS	Safari	17+	Full
iOS	Chrome	120+	Full
iOS	DuckDuckGo	Latest	Full
Android	Chrome	120+	Full
Android	Firefox	117+	Full
Android	Samsung Internet	Latest	Full
Android	DuckDuckGo	Latest	Full

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Unsupported Browsers

The following browsers do not support XCover Elements:

Browser	Status	Reason
Internet Explorer	❌ All versions	End of Life; lacks Web Components, modern JS/CSS support
Chrome	❌ < 120	Missing ES2022 support and modern APIs
Firefox	❌ < 117	Missing modern CSS features and JS support
Safari	❌ < 17	Missing CSS nesting support and WebKit features
Edge Legacy	❌ All versions	Replaced by Chromium-based Edge
Opera	❌ < 106	Missing ES2022 support
Opera Mini	❌ All versions	Does not support Web Components; outdated JS engine
UC Browser	❌ < 2023	Missing Web Components, CSS nesting, ES2022 support
KaiOS Browser	❌ All versions	Missing ES2022 support