Question

is it possible to define custom tags in HTML?

Answer 1

No. It is not possible to define custom tags in HTML because it is a set of pre-defined tags. New tags can be defined in XML, that is, eXtensible Markup Language. A difference between HTML and XML is that HTML is used to represent data and XML is used to store data. Another difference is that in XML, we can define our own tags while in HTML, we need to use pre defined tags that have a specific function. Hope it helps.