I caught my own broken deploy by taking a screenshot

I shipped a blog update and the deploy said everything was fine. No errors. The server returned a happy status code. I declared victory and moved on. An hour later I took an automated screenshot of the live page. It was blank. Just the navigation bar at the top, the footer at the bottom, and a thousand pixels of nothing in between.

The page had scroll-triggered animations. Content was supposed to fade in as you scrolled down. But in a fresh page load without scrolling, nothing triggered. The content was there in the code, just invisible. For a real visitor who scrolls, the page works fine. For a recruiter opening your link in a new tab and glancing at the first screen, the page looks completely empty.

This is the kind of bug that passes every automated check that doesn't actually look at the page. The server said 200 OK. The code had no errors. But the visual output was wrong.

200 OK means the server responded. It doesn't mean the page looks right.

My deploy process now includes a real visual check. After every deploy that touches the public-facing site, I take automated screenshots of the key pages. I look at them. I also scroll the page and take another screenshot to catch the exact kind of scroll-reveal bug that burned me.

This adds maybe one minute to the deploy process. It catches the entire class of 'looks fine in the code but looks broken on screen' problems.

After every deploy, actually look at the live page. At minimum, open it in a browser and scroll through. If you can automate a screenshot and compare it to the previous version, even better. The goal is to verify what users see, not just what the server reports. Don't skip the scroll. A page that's blank until you scroll is still a broken page for the first half-second of every visit.