> For the complete documentation index, see [llms.txt](https://roveroniandrea.gitbook.io/htpl-compiler/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://roveroniandrea.gitbook.io/htpl-compiler/what-is-htpl-and-why-it-exists.md).

# What is HTPL and why it exists

### What can you do in HTPL?

HTPL supports lots of the basic feature required for a programming language. It allows you to declare variables, compute operations, assigning values, evaluating logical expressions, inserting conditions with an `if then else` structure, and supports the `while` loop construct. In addition to this, it provides interfaces for user inputs and program outputs via `prompt` and `alert` JS functions.

### Why using HTPL?

HTPL main purpose is to destoy the "HTML is not a programming language" meme, but you're able to make complex programs too, if you want.