Latest
Interactive examples
Each demo is a standalone HTML file. Click a card to open it.
Web APIs
Mastering the Intersection Observer API
Lazy loading, scroll-triggered animations, and efficient viewport detection using the Intersection Observer API.
Python
Structured Logging in Python
An interactive walkthrough of structured logging concepts with a live demo of JSON logs, filters, and context variables.
SQL
Cohort Analysis Using Pure SQL
A browser-based SQL demo that computes user cohorts, retention, and rolling activity with DuckDB WASM.