Browser Compatibility Checker — Can I Use
Check browser support for CSS, JavaScript, HTML, and Web API features. Filter by support level across Chrome, Firefox, Safari, and Edge.
36 features
CSS Grid
Two-dimensional grid-based layout system.
Flexbox
One-dimensional layout model for distributing space.
Container Queries
Style elements based on the size of their container.
:has() Selector
Parent selector that matches if any selector argument matches.
CSS Nesting
Nest style rules inside other rules for better organization.
Subgrid
Allow nested grids to adopt the track sizing of the parent grid.
aspect-ratio
Set a preferred aspect ratio for an element.
backdrop-filter
Apply graphical effects like blur to the area behind an element.
Scroll Snap
Control scroll positions to snap to defined points.
gap (flexbox)
Set gaps between flex items without margins.
color-mix()
Mix two colors together in a given color space.
@layer
Declare cascade layers to control specificity ordering.
:is() / :where()
Forgiving selector lists that simplify complex selectors.
Individual Transforms
Use translate, rotate, and scale as individual CSS properties.
Optional Chaining (?.)
Access nested object properties without null checks.
Nullish Coalescing (??)
Return the right operand when the left is null or undefined.
Top-level await
Use await at the top level of ES modules.
structuredClone()
Deep clone JavaScript values including complex types.
Array.at()
Access array elements with positive and negative indices.
Object.hasOwn()
Check if an object has a property as its own (not inherited).
Promise.allSettled()
Wait for all promises to settle regardless of fulfillment or rejection.
Import Assertions
Assert the type of imported modules (e.g., JSON imports).
RegExp Lookbehind
Match patterns preceded by another pattern.
<dialog> Element
Native modal and non-modal dialog boxes.
Popover API
Built-in popover behavior with the popover attribute.
<details> / <summary>
Native collapsible disclosure widget.
loading="lazy"
Native lazy loading for images and iframes.
input type="date"
Native date picker input without JavaScript libraries.
Intersection Observer
Observe when elements enter or leave the viewport.
ResizeObserver
Observe changes to the size of an element.
Web Share API
Invoke the native sharing mechanism of the device.
Clipboard API
Read and write text and data to the system clipboard.
Web Workers
Run scripts in background threads.
Service Workers
Proxy network requests for offline support and push notifications.
WebAssembly
Run compiled code at near-native speed in the browser.
View Transitions API
Animated transitions between DOM states or page navigations.
Browser Compatibility Checker — CSS & JS Feature Support
Check whether specific CSS properties, JavaScript APIs, and HTML features are supported across major browsers. Enter a feature name and see compatibility data for Chrome, Firefox, Safari, Edge, and mobile browsers.
Based on real browser compatibility data, the checker shows support status across current and recent browser versions. Color-coded results make it easy to spot which browsers need fallbacks or polyfills for the features you want to use.
Cross-browser compatibility remains one of web development's persistent challenges. A CSS feature that works perfectly in Chrome might render differently in Safari or not work at all in older Edge versions. Checking compatibility before implementation saves hours of debugging.
After verifying feature support, use our CSS Flexbox Generator or CSS Grid Generator to build layouts with built-in fallbacks. Our Responsive Design Tester lets you preview the actual rendering across different viewports.
For a complete cross-browser development workflow, verify feature support with this tool, test actual layouts across viewport sizes with our Responsive Design Tester, generate compatible CSS layouts with our CSS Flexbox Generator or CSS Grid Generator, and validate your meta tags with our Meta Tag Generator.
How the Browser Compatibility Checker Works
- Enter a CSS property, JavaScript API, or HTML feature name
- View compatibility data across Chrome, Firefox, Safari, Edge, and mobile browsers
- See which browser versions first introduced support
- Check the global usage percentage of supported browsers
- Get polyfill or fallback recommendations for unsupported browsers
Managing Browser Compatibility
Browser compatibility becomes manageable with a clear support policy. Define which browsers and versions you officially support based on your analytics. For most sites, supporting the last 2-3 versions of major browsers covers 95%+ of visitors. Use progressive enhancement: build a core experience that works everywhere, then add advanced features for capable browsers. CSS @supports queries let you conditionally apply styles based on feature support. For JavaScript APIs, check for feature existence before using them (if ('IntersectionObserver' in window)).
When to Check Browser Compatibility
Check compatibility before using new CSS features (container queries, :has() selector, subgrid), when adopting new JavaScript APIs (View Transitions, Popover API), when debugging layout issues reported in specific browsers, when setting up a project's browser support policy (browserslist configuration), or when evaluating whether to use a polyfill or fallback approach.
Common Use Cases
- •Verify CSS Grid subgrid support before using it in a production layout
- •Check if the Popover API is safe to use without a polyfill
- •Determine browserslist configuration for a new project's build tools
- •Test actual layouts across devices with our Responsive Design Tester Responsive Design Tester — Multi-Device
- •Evaluate whether to use native CSS nesting or continue with a preprocessor
Expert Tips
- ✱Check your own analytics for your visitors' actual browser distribution — global stats may not match your audience
- ✱Use @supports in CSS to progressively enhance without breaking older browsers
- ✱Safari is often the lagging browser for new CSS features — always verify Safari support explicitly
- ✱Autoprefixer handles vendor prefixes automatically — focus your compatibility checks on feature existence, not prefixes
Frequently Asked Questions
- Partial support means the browser implements the feature but with limitations, bugs, or missing sub-features. For example, a browser might support CSS Grid but not the subgrid feature. Always check the specific notes to understand what works and what doesn't.
- It depends on the feature's importance to your user experience and the percentage of visitors using unsupported browsers. A polyfill for a critical feature used by 5% of your visitors may be worthwhile. A polyfill for a decorative feature affecting 0.5% of visitors adds unnecessary weight.
- Browsers release updates every 4-6 weeks. Major new feature support typically arrives in Chrome first, followed by Firefox and Edge (which share some rendering components), with Safari on its own release schedule. Check compatibility data when starting a new project and when updating an existing project's browser support policy.
What does 'partial support' mean?▾
Should I use polyfills for unsupported features?▾
How often does browser support data change?▾
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