A bug in your program will not only degrade the usability of your website, but it will also harm your developer's reputation. In this answer, we will review some fundamental checklist items that will allow you to deliver a bug-free web application in production.
- Mobile-first web design: Because most people currently access websites via mobile devices, your website must be fully responsive and compatible with mobile devices and browsers to reach a larger number of people.
- Cross-browser testing: The days of Internet Explorer being the only browser available on the market are long gone. Numerous new browsers are released virtually every day, and web apps that work flawlessly in Google Chrome frequently fail in Opera, Safari, or other browsers.
- Accessibility testing: W3C has established a set of norms and standards that enterprises and people must follow before establishing a web application. According to the standards, the application should be accessible to everyone, including persons with impairments.
- HTML and CSS checking: Validating your HTML or XHTML code with W3C Markup Validation, the World Wide Web Consortium's official validator tool, ensures it is error-free.
- Security testing: Security testing is critical whether your website deals with online shopping, banking, or any other activity where customer data should be kept secret.
We have a dedicated blog where you can find a detailed checklist to test your website.