How does the Browser Compatibility Checker look up feature support?

ToolJiffy queries an embedded client-side web compatibility database in browser memory to report native feature support across Chrome, Safari, Firefox, Edge, iOS Safari, and Android Chrome. It returns precise browser version thresholds without calling external APIs.

What CSS, JS, and HTML5 web features can I query for browser support?

You can query CSS properties (Flexbox, CSS Grid, Subgrid, Container Queries, Aspect Ratio), JavaScript APIs (Fetch, Web Workers, Service Workers, WebAssembly, WebGPU, ResizeObserver), and HTML5 elements (Dialog, Canvas, Picture, Web Manifest).

What does the global support percentage score represent?

The global support score displays the estimated percentage of active worldwide web users whose desktop or mobile browser natively supports the queried web feature, helping you decide if progressive enhancement or polyfills are necessary.

What are CSS vendor prefixes and when are they still required?

Vendor prefixes like -webkit- or -moz- were used by browser vendors to implement experimental CSS features. Modern browsers support standardized syntax, but tools like Autoprefixer can add legacy prefixes for older browser builds.

How do I determine if a JavaScript feature requires a polyfill fallback?

If target browser versions lack native support for a JavaScript API (such as IntersectionObserver or Promise.allSettled), including a polyfill script ensures script execution without throwing runtime errors on legacy browsers.

Are mobile browser versions tracked alongside desktop browsers?

Yes! The compatibility lookup matrix provides detailed version support thresholds for mobile browsers, including iOS Safari, Android Chrome, and Samsung Internet, alongside major desktop engines (Blink, Gecko, WebKit).

Is my feature search query logged or sent to external servers?

No. ToolJiffy operates on a 100% zero-cloud client architecture. All search indexing, feature filtering, and compatibility data lookups execute entirely within local browser memory. Your queries and internal project search terms remain completely private.

Is the ToolJiffy Browser Compatibility Checker free to use without limits?

Yes! ToolJiffy Browser Compatibility Checker is 100% free with unlimited feature queries, zero account creation, no subscriptions, and no watermarks. Front-end engineers and web architects can research feature support freely anytime.

Browser Compatibility Checker

Free online browser compatibility checker — deciding whether you can use a feature without a polyfill.

100% Private — Runs entirely in browserInstant calculation & resultFree, no sign-up

Curated baseline-support snapshot (July 2026) for commonly-asked features. For exhaustive per-version data, cross-check caniuse.

Feature	Chrome	Firefox	Safari	Edge	Advice
CSS Grid	yes	yes	yes	yes	Universally safe.
CSS Subgrid	117+	yes	16+	117+	Safe for modern targets.
Container Queries	105+	110+	16+	105+	Baseline since 2023.
:has() selector	105+	121+	15.4+	105+	Baseline since 2023.
CSS Nesting	120+	117+	17.2+	120+	Use plain (non-&) selectors carefully.
View Transitions API	111+	no	18+	111+	Progressive enhancement only.
WebGPU	113+	flag	26+	113+	Feature-detect and fall back.
WebAssembly	yes	yes	yes	yes	Universally safe.
Service Workers	yes	yes	yes	yes	Universally safe.
WebP image	yes	yes	14+	yes	Safe; AVIF needs fallback for old Safari.
AVIF image	yes	yes	16.4+	yes	Provide WebP/JPEG fallback.
Lazy loading (img)	yes	yes	15.4+	yes	Safe.
dialog element	yes	98+	15.4+	yes	Safe for modern targets.
Popover API	114+	125+	17+	114+	Baseline 2024.
structuredClone	98+	94+	15.4+	98+	Safe.
Clipboard API (write)	yes	yes	13.1+	yes	Requires user gesture.
Web Share API	yes	no (desktop)	yes	yes	Mobile-first; feature-detect.
IndexedDB	yes	yes	yes	yes	Safe.
CSS scroll-snap	yes	yes	yes	yes	Safe.
text-wrap: balance	114+	121+	17.5+	114+	Progressive enhancement.
OffscreenCanvas	yes	105+	16.4+	yes	Safe for modern targets.
Import maps	yes	108+	16.4+	yes	Safe.

Why check feature support with ToolJiffy Browser Compatibility Checker?

The web platform evolves rapidly, introducing powerful CSS features (CSS Container Queries, Subgrid, CSS Nesting, Aspect Ratio), advanced JavaScript APIs (WebAssembly, WebGPU, Service Workers, ResizeObserver), and HTML5 elements. However, browser engines update at varying speeds across desktop and mobile platforms. Shipping cutting-edge web features without checking cross-browser version compatibility risks breaking website layouts or throwing fatal JavaScript errors for users on older Safari builds, enterprise desktop systems, or mobile browsers.

The ToolJiffy Browser Compatibility Checker provides front-end developers, web architects, and QA engineers with instant cross-browser feature support lookups directly inside their browser. By querying an in-memory compatibility dataset, the tool delivers real-time version support matrices across major desktop and mobile browser engines—including Google Chrome, Apple Safari, Mozilla Firefox, Microsoft Edge, iOS Safari, and Android Chrome—along with global market share support scores.

Instant Cross-Browser Compatibility Matrix: Query CSS, JavaScript, and HTML5 feature support across Chrome, Firefox, Safari, Edge, and mobile platforms.
Global Market Share Support Percentages: View worldwide user adoption metrics to evaluate progressive enhancement strategies and polyfill requirements.
Polyfill & Vendor Prefix Warnings: Identify when vendor prefixes (-webkit-) or JS polyfill fallbacks are required for legacy browser compatibility.
100% On-Device Browser Security: Executes feature lookups locally inside browser memory without tracking search queries or logging internal research.

Verifying browser compatibility before deploying code ensures consistent cross-browser performance, protects user conversion rates, and reduces post-release bug fixes.

Client-side CanIUse compatibility database engine architecture

Delivering instant compatibility search results without relying on slow remote API requests requires a localized data lookup model. The ToolJiffy Browser Compatibility Checker queries an embedded client-side database inspired by CanIUse data structures directly in browser memory.

When a developer types a web feature keyword (such as flexbox, fetch, or webgpu) into the search editor, an optimized fuzzy search algorithm evaluates the query against an indexed list of feature keys, aliases, and specification names.

The engine maps the matching feature record against version matrix arrays for major browser families (Blink, WebKit, Gecko). It calculates native support thresholds, identifies partial support flags (such as vendor prefix requirements or flag configurations), and aggregates active user market share data to compute an accurate global support score percentage in milliseconds.

Client-side security for private feature research and technical specs

Researching web feature support for proprietary applications, client projects under NDA, or unreleased tech specs requires complete privacy. ToolJiffy operates on a zero-cloud architecture where all compatibility lookups execute 100% locally in your browser memory, keeping your research confidential.

Step-by-step guide to checking browser compatibility

Type CSS, JS, or HTML Feature Name: Enter a web feature keyphrase (such as container queries, fetch, or webgpu) into the search bar above.
Inspect Cross-Browser Version Matrix: Review native browser version support thresholds across desktop engines and mobile platforms.
Check Global User Support Score: Evaluate global adoption percentages to decide whether to implement progressive enhancement fallbacks or JavaScript polyfills.

Explore related web developer utilities

Ensure seamless cross-device compatibility with our complete set of developer tools: test responsive viewports using the Responsive Screen Tester, preview live CSS styles with the CSS Preview, test HTML markup with the HTML Preview, and follow our step-by-step PWA Checklist.

Frequently Asked Questions

How does the Browser Compatibility Checker look up feature support?
ToolJiffy queries an embedded client-side web compatibility database in browser memory to report native feature support across Chrome, Safari, Firefox, Edge, iOS Safari, and Android Chrome. It returns precise browser version thresholds without calling external APIs.
What CSS, JS, and HTML5 web features can I query for browser support?
You can query CSS properties (Flexbox, CSS Grid, Subgrid, Container Queries, Aspect Ratio), JavaScript APIs (Fetch, Web Workers, Service Workers, WebAssembly, WebGPU, ResizeObserver), and HTML5 elements (Dialog, Canvas, Picture, Web Manifest).
What does the global support percentage score represent?
The global support score displays the estimated percentage of active worldwide web users whose desktop or mobile browser natively supports the queried web feature, helping you decide if progressive enhancement or polyfills are necessary.
What are CSS vendor prefixes and when are they still required?
Vendor prefixes like -webkit- or -moz- were used by browser vendors to implement experimental CSS features. Modern browsers support standardized syntax, but tools like Autoprefixer can add legacy prefixes for older browser builds.
How do I determine if a JavaScript feature requires a polyfill fallback?
If target browser versions lack native support for a JavaScript API (such as IntersectionObserver or Promise.allSettled), including a polyfill script ensures script execution without throwing runtime errors on legacy browsers.
Are mobile browser versions tracked alongside desktop browsers?
Yes! The compatibility lookup matrix provides detailed version support thresholds for mobile browsers, including iOS Safari, Android Chrome, and Samsung Internet, alongside major desktop engines (Blink, Gecko, WebKit).
Is my feature search query logged or sent to external servers?
No. ToolJiffy operates on a 100% zero-cloud client architecture. All search indexing, feature filtering, and compatibility data lookups execute entirely within local browser memory. Your queries and internal project search terms remain completely private.
Is the ToolJiffy Browser Compatibility Checker free to use without limits?
Yes! ToolJiffy Browser Compatibility Checker is 100% free with unlimited feature queries, zero account creation, no subscriptions, and no watermarks. Front-end engineers and web architects can research feature support freely anytime.