Update index.html

Put the YUI seed file on your page.

The YUI seed file is an ultra-small bit of JavaScript that enables you to load any YUI component on your page.
Update index.html

Work with the DOM

The Node component makes it quick and convenient to access, create, and manipulate DOM elements. Node APIs accept element references or selector queries for accessing DOM elements.
Merge pull request #2 from gsydonkey/YUI-3.11.0

Yui 3.11.0
Merge pull request #3 from gsydonkey/Sandbox

Update index.html
Merge pull request #4 from gsydonkey/Node

Update index.html
Update index.html

Reinstated corrupted file.