Visual Hierarchy - organizing elements on a page according to importance
Button States - designing buttons to appear different when you press or hover over them creating different user states.
Landmarks - are like bread crumbs they show where you've been and how to get back.
Skip to Content (Screen Reader) - this is an advanced function that lets the person using a screen reader on your page skip from page to page rather than tabbing through each individual link.
Legends - like on a map, they hold a bank of information about what icons or illustrations on the page mean.
Page Titles - A description at the top of each page
Errors - Error messages are indicators of the performance of the webpage. They indicate when something has gone wrong and also need to be accessible to be read by screen readers.