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The best regex debugger on the web. Real-time explanation, match highlighting, test strings, and a library of saved patterns. Supports PCRE2, JavaScript, Python, Golang regex. It explains each token in plain language beside the pattern, which turns debugging into reading rather than guessing.

Instantly get a unique URL to inspect and debug webhooks. See incoming HTTP requests in real-time — headers, body, params. Essential for building and testing webhook integrations.

A test and examples page for MarkSimple, a simple Markdown parser written in PHP. It shows how the parser renders various Markdown input, which helps developers evaluate the library before adopting it or verify its output while working on PHP projects that need Markdown rendering.

A live demo and reference implementation of the conditional pre-lift fix for the iOS PWA keyboard scroll-jump bug. Web developers can toggle the fix on and off, watch viewport metrics change in real time, and read the source to apply the technique in their own apps.

A demonstration site that implements a range of progressive web app techniques in one simple project. Rather than a consumer product, it serves as a working example for developers who want to see PWA features applied in practice and borrow the patterns for their own sites.

A Markdown editor that opens and saves files directly on your device, built as a demo of the browser's File System Access API. Useful for writers who want to edit local Markdown documents in a browser, and for developers studying how the API handles local file workflows.