This is part of a continuing series of web accessibility tips for IT personnel, web managers and web development groups. These tips can be used to review current website accessibility and to utilize in developing new websites with the hope of improving web accessibility for everyone.
Content must remain readable and understandable when text size or page zoom is set to at least 200% or twice the default size. While it is optimal to decrease the likelihood of horizontal scrollbars or changes in visual design or document layout at these settings, readability and understandability are most critical to accessibility. This can be tested by selecting Control + (or Command + on a Mac) in your web browser or by increasing the text size under the View menu.