I don't know a specific name for the style, but it seems to be a fixed with in-page navigation. You put a fixed at the top of the page with a menu and then each is named such as

     <a name="Section 1" />  

Then, at the top of your page, in the menu bar (your fixed ), you'd put the link to that section:

    <a href=”#Section 1”>Section 1</a>

I don't know a specific name for the style, but it seems to be a fixed div with in-page navigation. You put a fixed div at the top of the page with a menu and then each div is named such as

     <a name="Section 1" />  

Then, at the top of your page, in the menu bar (your fixed ), you'd put the link to that section:

    <a href=”#Section 1”>Section 1</a>