- Find and fix general development issues- A validator may help you figure out some mistakes that seem so simple. For HTML, it validates the tags are closed and nested, a DOCTYPE is used, and tags are used correctly while for CSS it checks that the property names and values are spelled correctly, no curly braces are missed, and other CSS properties.
- Hunting common errors with the help of inbuilt developer tools of your browser. This works well for CSS errors as HTML errors normally don’t tend to show up in dev tools as they try to cover them up by correcting badly formed markup automatically.
- Keep a checklist of unsupported CSS Elements in browsers.
- Keep a checklist of unsupported HTML Elements in all browsers.