Is there any method or way to do this?

I'm new to programming, I have a little experience with HTML (hence JavaScript), and I need something like this:

Something that "reads" an html file and takes some information straight from the source.

For example:

<div class=exemplo>
    <ol>
      <li>ex1</li>
      <li>ex2</li>
      <li>ex3</li>
    </ol>
</div>

In an HTML and return what I want it to return.

Is it possible to do this via JS?

Thanks in advance.