HTML5 with WordPress

Hi guys,

Is there any possible to run a landing page that is html5 website inside of wordpress root folder, so there will be index.php from wordpress and index.html from my landing page.

landing page will have links that will access the wordpress pages

the structure i`m thinking to be is:

<img src="http://www.andreaminini.com/data/andreaminini/come-creare-un-sito-con-wordpress-3.gif">

Inside this folder, to put the index.html with it`s content folder
and when somebody access de main domain, should run under the landing html page

Is this possible?
If yes, how will affect the wordpress structure?