Network

Browser Compatibility Detector

Test the current browser for real support across web APIs, CSS, JavaScript, media, storage, security context, and device capabilities. Use it for release readiness, cross-browser debugging, customer environment acceptance, and fallback planning.

  • Review results by overview, graphics, media, storage, device, security, and frontend features
  • Measure exposed capabilities in the current page context instead of relying only on browser version
  • Compare against major browser version references when defining support and regression strategy
  • Copy results into issue tickets, QA reports, release checklists, and customer acceptance records
  • Use the fullscreen workspace for team reviews and complex compatibility investigations
tools/Browser Compatibility Detector
Overview
Click Run detection to show browser capability results for this environment.
Command

Overview

Built for production release checks, regression QA, and incident troubleshooting where actual runtime capability matters more than browser identity alone.

  1. 01

    Current-environment capability checks

    Verify whether APIs are exposed, queryable, and affected by secure context, permission state, or page policy.

  2. 02

    Web platform API diagnostics

    Cover permissions, clipboard, storage, network, security, and device capabilities to identify unsupported, partial, and unknown states.

  3. 03

    CSS and JavaScript feature checks

    Check container queries, selectors, nesting, module loading, structured cloning, big integers, and other modern frontend capabilities.

  4. 04

    Media and graphics verification

    Verify realtime communication, recording, screen capture, graphics rendering, video codecs, and common audio/video playback support.

  5. 05

    Major browser version references

    Compare Chrome, Edge, Firefox, and Safari support versions to guide minimum support policy and release compatibility matrices.

  6. 06

    Copy-ready records and baselines

    Reuse output in QA reports, release checklists, issue tracking, customer acceptance, and long-term compatibility baselines.

How to use

Start with a support target, run the checks, rank the risks, choose fallback behavior, then confirm results on real devices and product flows.

  1. 01

    Define target browsers, minimum versions, mobile coverage, and the product flows that must keep working.

  2. 02

    Run category checks to capture a runtime snapshot across graphics, media, storage, security, device, and frontend features.

  3. 03

    Prioritize unsupported and partial items by their impact on login, payment, upload, playback, sharing, and other critical flows.

  4. 04

    Use version references to decide whether you need compatibility code, fallback paths, server-side handling, or feature flags.

  5. 05

    Re-test on real devices and realistic networks to confirm permission, secure-context, response-header, and hardware constraints.

  6. 06

    Document and track results in release checklists and regression suites for repeatable compatibility governance.

Details

Covers the areas most likely to create release risk and presents the findings in a structure that is easy to judge and reuse.

  • Real-time browser capability detection in the current page context, not a static guess.
  • Permission and secure-context checks for location, clipboard, notifications, secure contexts, and cross-origin isolation.
  • Media and graphics checks for rendering, realtime communication, recording, codecs, picture-in-picture, and screen capture.
  • Storage and offline checks for local storage, session storage, structured databases, cache, offline behavior, and quota estimates.
  • Modern CSS checks for grid layout, container queries, relational selectors, native nesting, view transitions, and viewport units.
  • Modern JavaScript checks for modules, dynamic import, structured cloning, big integers, URL matching, and locale-aware segmentation.
  • Browser version references for Chrome, Edge, Firefox, and Safari to support engineering decisions.
  • Copyable output for collaboration, defect tracking, release review, and audit history.

Use cases

Useful when release risk, browser identity, runtime capability, and user-reported failures need to be compared side by side.

  1. Pre-release browser compatibility validation

    Run structured checks against your support matrix before production rollout.

  2. Browser-specific incident debugging

    Explain blank screens, broken controls, media failures, and similar reports with capability evidence.

  3. Critical flow hardening

    Validate compatibility risk for authentication, payments, upload pipelines, and media playback journeys.

  4. Media and realtime readiness checks

    Verify WebRTC, recording, codecs, and screen-capture support before enabling communication features.

  5. Modern CSS adoption risk review

    Estimate support impact before adopting container queries, relational selectors, native nesting, and related features.

  6. Fallback strategy planning

    Map unsupported and partial findings to compatibility code, alternate APIs, or feature-flag rollouts.

  7. Regression coverage expansion

    Turn high-risk compatibility findings into targeted automated and manual test cases.

  8. Cross-team decision alignment

    Share one compatibility baseline across frontend, QA, product, and platform teams.

See also

If a bug report only includes a raw UA string or server log line, start with User-Agent Parser to normalize the browser, OS, device, and bot context. When the failure happens after a callback, redirect, or deep link, use URL Tools as well, so URL structure and runtime capability evidence stay together in the same investigation.

Best practices

Compatibility diagnostics deliver value when they are tied to release gates and measurable business impact.

  • Define explicit support policy first: target browsers, minimum versions, and mobile constraints.
  • Classify findings by impact level: conversion blocker, degraded UX, or acceptable variance.
  • Prepare executable fallbacks for high-impact unsupported capabilities.
  • Include compatibility verification in pull-request review and pre-release acceptance checklists.
  • Always test permission-dependent APIs in both granted and denied states.
  • Re-test media and graphics features on different hardware/OS combinations to catch decoder and GPU differences.
  • Validate deployment prerequisites for security-sensitive APIs (HTTPS, CSP, COOP/COEP, cross-origin policy).
  • Tie remediation priority to user impact and key funnel completion rate.

Limitations

This tool provides a runtime capability snapshot, not a substitute for end-to-end business-flow validation.

  • Behavior can differ by OS version, hardware profile, enterprise policy, and browser build channel.
  • Permission-gated APIs can appear available while remaining unusable until user consent is granted.
  • A supported status does not guarantee production correctness without parameter, timing, and error-path validation.
  • Media and graphics outcomes can change with hardware acceleration, codec packs, and driver stack differences.
  • MDN compatibility data is reference context, not proof of runtime availability in your exact page environment.
  • Final ship/no-ship decisions still require real-environment end-to-end validation.

FAQ

Answers to common questions about usage, data handling, result checks, and practical limits.

Why does an API show Partial support?

The interface may exist, but behavior can be limited by permissions, flags, platform constraints, or policy.

Why is support different between my machine and users?

Browser version, OS, device, policy, and privacy settings can significantly change runtime capability.

Can this replace real product-flow testing?

No. It is a fast compatibility triage layer and should be paired with end-to-end validation.

What if MDN reference and runtime result disagree?

Use runtime detection as ground truth for the current environment, and MDN as version context.

Why are permission-related APIs unstable?

They depend on user consent state and browser context constraints, which can vary over time.

How should I use results in release workflow?

Map Unsupported/Partial findings to release risk items and require mitigation for critical paths.

Can this help CSS compatibility debugging?

Yes, especially for modern features like container queries, :has(), nesting, and viewport units.

Can this help media capability triage?

Yes. It covers codec readiness, recording, WebRTC, and screen-capture related capabilities.

Does it work on mobile browsers?

Yes. Run it directly on target mobile devices and browser versions for accurate results.

Why run detection repeatedly?

Some APIs are context-sensitive and permission-sensitive, so repeat checks improve confidence.

Is it suitable for long-term compatibility governance?

Yes, especially when used for periodic baseline snapshots tied to release cycles.

How does it complement User-Agent analysis?

Use UA tools for environment identity and this detector for real capability verification.

Which checks should I prioritize first?

Start with capabilities that directly affect critical paths: auth, storage, network requests, and media playback/capture.

How do I define a minimum acceptable compatibility level?

Use business-task completion as the baseline: users must complete core actions even when enhancement features are unavailable.

Can this guide performance-oriented feature rollout?

Yes. Use results to gate advanced features such as WebWorker, WebAssembly, and WebCodecs by capability availability.

Do Unsupported results always mean we must drop the feature?

Not necessarily. You can ship with fallback logic, phased rollout, or feature flags based on audience and business value.

Can this be used for enterprise/customer environment acceptance?

Yes. Run checks in the actual customer browser environment and archive the output as acceptance evidence.

Related tools

Pair this detector with URL analysis, User-Agent parsing, and subnet calculation when browser environment, link structure, and network range all matter.