Validation. Making sure that your site doesn’t have any structure issues.
Have you ever been making a website and a > has been out of place or an image doesn’t load. You spend hours trying to find out where the problem lies. Well, now there is a solution w3schools has a validation tool. An online tool that you can type in the address and it will find any errors in the site.
Websites need to be valid so that the viewer will get a better user experience. All the pictures load and there is no visual stray code. The loading is better too. It saves you hours of pointless work and money purchasing a similar tool.
Thanks for reading!