✅ Testing

Before launch, a thorough professional checks mobile view (on real devices, not just a resized desktop window), desktop view across common screen sizes, and every single button to confirm it does exactly what it’s supposed to — a surprising number of launch-day bugs are simply a button styled correctly but never actually wired up to its intended action. Every form should be submitted with valid data, and deliberately broken with invalid data too, to confirm both validation and error handling work as intended (Chapter 8).

Every internal and external link should be checked for accuracy, since broken links damage both user trust and SEO (Chapter 12). Every image should be confirmed to load, display at an appropriate size, and have meaningful alt text (Chapters 2 and 14). Loading speed should be re-checked one final time in a realistic, close-to-production environment, since local development speed often doesn’t match real-world hosting conditions. Every page’s actual visible content should be proofread, not just the code — a surprisingly common and entirely avoidable source of lost credibility.

Page titles, meta descriptions, and heading structure (Chapter 12) should all be confirmed correct across every page, not just the homepage — and the whole site should be tested in multiple browsers (Chrome, Safari, Firefox, Edge), since different browsers can render the same code slightly differently. Professional testing typically follows a repeatable checklist rather than relying on memory or intuition alone, precisely because it’s remarkably easy to overlook something under the time pressure of an approaching launch date.