Devlog: How Our AI Agents Jan and Klára Built a Client-Side CSS & HTML Cross-Browser Compatibility Analyzer

In the world of web development, one of the biggest headaches is ensuring consistent appearance and behavior across all major browsers. Every developer has experienced the frustration of code working perfectly in Chrome, only to behave differently in Safari or Firefox. This problem consumes countless hours of debugging and testing.

That's why we decided to create the CSS & HTML Cross-Browser Compatibility Analyzer – a powerful client-side tool designed to eliminate these pains. Not only did we build it, but we had it designed and programmed by our AI agents Jan and Klára, with final verification by Martin and deployment by Tomáš.

What Our Analyzer Does

The tool allows developers to paste their CSS and HTML code directly into the application. It instantly scans the code against a comprehensive, pre-loaded database of browser compatibility data (e.g., derived from caniuse.com) for various CSS properties, HTML elements, and JavaScript functions. It identifies potential inconsistencies across browsers, deprecated syntaxes, or features with limited support, highlighting them directly in the code and providing practical suggestions or polyfill recommendations.

The free version offers basic scans and summary reports. A one-time payment of $1.99 unlocks detailed, line-by-line reports with suggestions, unlimited scans, and the ability to export findings as structured JSON or PDF, saving countless hours of debugging and ensuring a flawless user experience.

The Technical Challenge and Our AI Agents' Solution

The primary technical challenge was processing and maintaining an extensive browser compatibility database and efficiently linking it with the code parser. The caniuse.com database is vast and requires careful structuring for fast and relevant queries in a client-side environment.

Our AI agent Jan (the coder) focused on the core functionality. His task was to design a robust parser for CSS and HTML capable of accurately identifying individual properties and elements. Subsequently, he implemented the logic for comparing these identified components with the compatibility database. Ensuring a rapid response, even with more complex code, was crucial.

"The analyzer's core is an intelligent parser that dynamically compares the pasted code with an extensive compatibility database. Optimizing search and delivering relevant suggestions was key to making the process instantaneous and providing developers with real-time feedback. We leveraged a structure similar to caniuse.com data but optimized it for fast in-browser queries, minimizing network latency and server dependency." – Jan (AI Developer)

AI agent Klára (the designer) was tasked with creating an intuitive user interface. She focused on a clean editor design where compatibility issues are clearly and visually highlighted. Furthermore, she designed clear reports and a user-friendly system for displaying suggestions and polyfills. It was important that even complex information was easily digestible.

Martin (QA) then conducted thorough testing. He verified that the analyzer correctly detects known issues, generates accurate suggestions, and functions reliably across various scenarios and browsers. His feedback was crucial for fine-tuning the algorithms and improving accuracy. The final step was deployment, handled by Tomáš, to make the tool available to all developers.

Jan's Code Snippet Example

Here's an example of the JavaScript code that handles widget configuration and initialization, including Firebase and multi-language support:

        const WIDGET_SLUG = "cross-browser-kompatibilita-analyzator";
        const FIREBASE_CONFIG = {
            apiKey: "AIzaSyFakeKeyForShowcaseHubAuthTestingOnly",
            authDomain: "pixeloffice-hub.firebaseapp.com",
            projectId: "pixeloffice-hub",
            storageBucket: "pixeloffice-hub.appspot.com",
            messagingSenderId: "1234567890",
            appId: "1:1234567890:web:abcdef123456"
        };
        const PIXELOFFICE_API_BASE = "https://api.pixeloffice.eu/api/pay";
        const WHATSAPP_NUMBER = "420607450436";

        let currentAuthMode = 'login'; // 'login' or 'register'
        let unsubscribeAuthStateChanged = null;

        // --- Firebase Initialization ---
        if (!firebase.apps.length) {
            firebase.initializeApp(FIREBASE_CONFIG);
        }
        const auth = firebase.auth();

        // --- i18n Dictionary ---
        const translations = {
            en: {
                widgetTitle: "CSS & HTML Cross-Browser Compa
// ... a další multijazyčné překlady

This configuration allows for easy integration with our systems and supports localization, which is crucial for a global audience.

Try it Yourself!

We are excited to offer you this tool. We believe it will save countless hours and frustration for many front-end developers, QA testers, and web agencies worldwide. See its power and speed for yourself.

Try our Cross-Browser Compatibility Analyzer live here!