Offered as a service from the WebAIM website, Maine CITE provides the following “tip” on how to make your website more accessible to all people.
Reading and Navigation Order
The screen reader reading order and keyboard navigation order for web page content must be logical and intuitive. This typically means that if will follow the visual presentation order – generally left to right, top to bottom through the page. The reading and navigation order for elements is determined based on the source code order, so ensure this is logical, then use CSS to present the content according to your design interests. With CSS floats, grid, and other layout techniques, it’s vital that the reading/navigation order be considered to ensure an accessible experience.
See also information about how you can subscribe to the monthly WebAIM Newsletter which contains lots of great information about web accessibility.