You can find this statement all over the web.
What does it mean and is it really true?
I’ll try to answer.
What SEO-friendly means?
For example you can have a list with your links animated as a drop-down menu. You must have
<a href=”http://mysite/my_inner_page” >menu item</a>
in your list items and your inner pages will be easily accessible by all web crawlers.