What are built-in HTML5 tags???

There are no such things as built-in html tags. The set of tags you use depend on the version of html you specify

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Html5 has many built in tags. Check out the tutorial here and you will know.

On w3schools.com you have a lot of informations about the languages for the web. Here's their inventory for the HTML5 tags: https://www.w3schools.com/tags/default.asp