HTML is the backbone of any website. It's the first thing people see. Without it, there would be no website.  Because of this, it's important that you stick to good coding practices. If you don't follow the best practices, you will create a bad user experience for the web user.

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 HTML is the backbone of any website. If you don't follow the best practices, you will create a bad user experience for the web user. Here are some guidelines to keep in mind when building an HTML-based website. Use only one <h1> element for one code sheet. Don't skip heading levels in HTML.

HTML Best Practices – How to Build a Better HTML-Based Website