give one table row headers and use headers attribute on another table.

We need to test low contrast, especially something close to being valid.
Create a module that doesn't expand vertically with text resizing.

Add some invalid aria
role="contact" - unrecognized role
aria-super - Invalid attribute
aria-selected="not yet" - invalid value

suggested by Joel Isaac

Add aria-owns to an incorrect element. This may not throw an error, as the attribute will have a valid value. But it does effect the user.
http://www.last-child.com/aria-owns-bookmarklet/
Add user-scalable="no" to the meta viewport. This should throw an error.

There are not enough mistakes in the content. Add the following

• link without href and onclick event
• link with javascript as href value
• link with href that doesn't match an element on page, i.e. #notonpage
• link hidden with clip, so a sighted keyboard user loses their focus

new code

        <ul class="pure-menu-list">