JavaScript

JavaScript is the programming language that runs in every web browser, responsible for everything interactive on a website: clicks, animations, form validation, real-time search filtering, and dynamic content updates. It’s the only programming language that browsers understand natively, which is why it became the universal language of the web. It has also expanded beyond browsers to power servers and applications through runtimes like Node.js.

The Simple Version

If HTML is the structure of a building and CSS is the paint and wallpaper, JavaScript is the electricity. It’s what makes things happen when you interact with a page: clicking a button to open a menu, typing in a search bar and seeing results filter in real time, scrolling and watching animations trigger.

JavaScript runs in your browser, which means the code travels to your computer and executes right there.

Why It Matters

JavaScript is what turns a static document into an interactive experience. But there’s a tradeoff: more JavaScript means more code your browser has to download and run, which can slow things down. Modern frameworks like Astro are designed to ship as little JavaScript as possible, only loading it where interactivity is actually needed.

How It’s Used on This Site

This site ships minimal JavaScript. Most pages are pure HTML. JavaScript only runs for interactive features:

• The glossary search at /glossary: filters terms as you type
• The experience timeline on the homepage: click to open role details
• The mobile navigation: hamburger menu on small screens
• The File Clarity™ demo at /projects/file-clarity: interactive before-and-after

Everything else is static HTML, which is why pages load fast.