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Browser Feature Support

LOCAL · Browser-Only

Check browser compatibility for CSS, HTML, JavaScript, and Web API features using real MDN data

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Data from MDN Browser Compatibility Data - Licensed under CC0 1.0

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What is Browser Feature Support?

Free online browser feature support to look up browser compatibility for CSS properties, HTML elements, and JavaScript APIs.

Search for any web feature and see which browsers support it, including version numbers and known issues. Based on real-world compatibility data. Essential for deciding which features to use in production and what fallbacks to provide. No signup required.

How to Use Browser Feature Support

1Search for a web feature by name (e.g., 'CSS grid', 'dialog element')
2View the browser support table showing versions
3Check notes for known issues or partial support
4Decide whether to use the feature or provide a fallback

Frequently Asked Questions

Where does the compatibility data come from?

The data is based on well-known browser compatibility databases and covers the latest versions of Chrome, Firefox, Safari, Edge, and their mobile counterparts.

How accurate is this data?

The tool provides general compatibility information for common features. For the most up-to-date and detailed data, cross-reference with caniuse.com for critical production decisions.

What features can I look up?

CSS properties (grid, flexbox, container queries), HTML elements (dialog, details), JavaScript APIs (fetch, IntersectionObserver), and more. Search by feature name to find compatibility info.

How do I check if a CSS property works in Safari?

Search the property name (for example container-queries or backdrop-filter) and read the support table. It lists the minimum Safari version where the feature works so you know whether to ship it or add a fallback.

Can I check whether a JavaScript API is widely supported?

Yes. Search the API name such as fetch or IntersectionObserver. The table shows support across desktop and mobile browsers so you can decide if a polyfill is needed.

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Keep reading: CSS Cheat Sheet and working without uploading reference. Doing this in code instead? See the JSON and data endpoints.

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