element can only be used once in each HTML file. HTML tags contain three main parts: opening tag, content and closing tag. This excludes any content that is repeated across multiple pages (such as navigation bars, headers, footers, etc). Mehr zu HTML main. HTML main tag is used to specify the main content of the web page. Perhaps one of the most important HTML tags for SEO is that of the title. The best time to save on Udacity courses is now - follow this coupon to access a 75% Udacity Black Friday discount & enjoy learning at a very low cost! Part of the web page structure is called nesting. The HTML tags can be widely differentiated on the basis of their utility, that is, on … The