Browser

Silverlight Out-of-Browser Apps

How to configure, install, and elevate Silverlight applications so they run as standalone desktop apps outside the browser sandbox.

The Silverlight Plugin and Browser Hosting

How the Silverlight browser plugin was installed, embedded into HTML pages, and extended through out-of-browser and elevated trust modes.

Silverlight Security Sandbox

How Silverlight's partial-trust sandbox, isolated storage, and cross-domain policies protected users, and what changed once elevated trust was granted.

Cross-Browser and Device Emulation

How Playwright's project configuration runs the same suite across Chromium, Firefox, and WebKit, and emulates mobile devices, locales, and permissions.

Cross-Browser Testing

Learn how to write and run Selenium tests that validate application behavior consistently across Chrome, Firefox, Edge, and Safari.

Headless Browser Testing

Run Selenium tests against browsers with no visible UI, speeding up CI execution while understanding the tradeoffs versus headed mode.

Installing Selenium and Browser Drivers

A practical walkthrough of installing the Selenium library and setting up matching browser drivers, including Selenium Manager's automatic driver handling.

What Is Selenium?

An introduction to Selenium, the open-source framework for automating web browsers, and why it's the backbone of web UI test automation.

Your First Selenium Script

A hands-on walkthrough of writing, running, and understanding a first Selenium WebDriver script in Python.

Connecting a Client

How to connect a browser or Node.js client to a Socket.IO server, configure connection options, and handle the connection lifecycle correctly.

WebSockets in the Browser

A practical guide to the native browser WebSocket API — connecting, sending and receiving messages, handling reconnection, and working with binary data efficie…

WebSockets Quick Reference

A condensed reference covering the WebSocket API, handshake headers, close codes, and common patterns for fast lookup while building or reviewing real-time fea…

Wasm in the Browser

How browsers load, validate, compile, and execute WebAssembly modules alongside JavaScript, and how the two communicate.

Wasm Outside the Browser

Running WebAssembly as a portable, sandboxed server and CLI runtime using WASI and standalone engines like Wasmtime and Wasmer.

Testing with a Real Browser

Learn how browser automation tools like Playwright and Cypress drive a real, rendered browser to test frontend behavior the way actual users experience it.

Browser Developer Tools

Use the Elements, Console, Network, and Lighthouse panels in browser DevTools to inspect, debug, and audit web pages.

Cross-Browser Compatibility

Techniques and tools for ensuring HTML and CSS work consistently across different browsers, including vendor prefixes, feature detection, and testing.

What is CORS?

CORS (Cross-Origin Resource Sharing) is a browser security mechanism that lets a server explicitly permit web pages from one origin to make requests to a diffe…

Preload vs Prefetch: What Is the Difference?

rel="preload" tells the browser to fetch a resource needed for the current page at high priority right now, while rel="prefetch" tells the browser to fetch a r…