Why this day exists

A screen can look the same in a browser and on a phone while being built from different pieces.

That difference stays hidden until you try to use a browser tag, inspect the page as HTML, or explain what actually runs on the device.

Today you will make a tiny welcome screen appear on Android, iOS, and web. More importantly, you will be able to trace how your TypeScript becomes a screen you can touch.

When one stage fails, that trace will tell you what to inspect next instead of making you restart everything.