Anyone who needs to change the font or text display properties to read the content will benefit from this guideline. This includes people with low vision who use a bigger font, and people with dyslexia, reading, or other cognitive disabilities, who may have specific spacing requirements.
Make it easier for users to interact with added content. Tooltips, drop-down menus, and popups are examples of added content. This new content is usually made visible when you put your mouse pointer over a "trigger" item such as a button or link. It can also display when an item receives focus. Some people have difficulty keeping the mouse pointer over the trigger item. Also, the new content will sometimes obscure existing content. The three requirements of this success criterion, as outlined below, help make the added content more operable.
When using magnification, tooltips or added content can display on top of other information. Unless the newly visible content is displaying an error, the user must be able to dismiss that content without moving the mouse or changing focus. The easiest way to implement this is by providing a keyboard command, such as pressing the escape key, to close the content. The developer can also include a close button within the added content.
Often the new content only displays when the mouse pointer is over the trigger element and disappears when the mouse moves off of the trigger. It can be hard for people with tremors or limited movement to keep the mouse over the trigger element. To remedy that situation, the content must stay visible as long as the mouse remains over the trigger or the mouse moves onto and remains over the new content.
This rule combines the previous two. The content must remain visible until the user dismisses it, the hover or focus trigger is removed, or the information is no longer valid.
People with disabilities rely on interface controls that are used programmatically. These controls have a visual label, as well as a programmatic label, known as its Accessible Name. Users have a much better experience if the visible text labels of controls match their accessible names.
Speech input users can navigate by speaking the visible text labels of menus, links and buttons that appear on the screen. It’s confusing to speech input users when they say a visible text label they see, but the speech input does not work because the accessible name that is enabled as a speech input command does not match the visible label.
Assistive technology users should be able to detect when important changes occur on a web page, With the use of a status message, information can be provided to the user without changing focus or unnecessarily interrupting their work. The following are the kinds of status messages to provide:
Placement of controls affects their ease of use. For example, for a search feature, the “submit” button should be positioned right after the input field. Appearance and positioning are particularly important when providing a control that supports “destructive” actions, such as a “delete” or “clear” button. In these cases, ensure that these controls are clearly differentiated .... Read more about ✎ Technique: Differentiating controls
Color-contrast-checking tools can compare two colors and report on the contrast ratio between them. Some tools will allow you to adjust these values until the ratio is sufficient, helping you to choose a color scheme that avoids contrast problems.... Read more about ✎ Technique: Checking color contrast
The <table> element is for data that one might find in a spreadsheet, consisting of rows and columns of cells. Browsers provide this mechanism to display table structures and to convey table data to assistive technologies. It's important to ensure that the editing process allows identifying row and column headers so that screen reader users can access the meaning of each data cell by understanding what row and column it appears in.
The most important part of any page is its content, which is made up of paragraph text and sometimes supplementary media like images or video. Headings are used to group and label sections of content, giving visual structure to the page and providing a means of navigation to screen-reader users.... Read more about ✎ Technique: Writing headings
Avoid referring to a button, menu, or other item in the page only by its position on the page; instead, use additional information that describes the content.
Referring to a specific item in the page content by only its visual position prevents people who use screen readers from being able to make sense of this visual description. Another downside to referring to items by their position is that their position might change when the page is viewed at different screen sizes, such as on a smartphone....
Lists are collections of related content. For example, a navigation bar is a list of links or a set of instructions may be an ordered (numbered) list. Clearly identifying a set of items as a list helps people understand that relationship. When you include a list in your page content, this relationship needs to be conveyed visually, and it also needs to be conveyed to people using screen readers.... Read more about ✎ Technique: Identifying lists of content
Headings are important orientation aids, and they help people quickly identify the content on your page. When headings are correctly identified, they also allow screen-reader users to quickly navigate from heading to heading using the screen reader's heading navigation functionality.
The best way to do this is to ensure that headings are identified in HTML. When using a web-content editor or a word-processing application, you can do this by making use of the heading options in the styles menu....
Some people understand complex information best when it's presented visually, such as as a chart or diagram, while others find that reading the information suits them better. For people who use screen readers, a good text equivalent of the information that’s presented graphically is essential for their understanding.
For simple graphics, providing a succinct, informative text alternative is usually fine. But for complex graphics, it's not enough to provide a screen reader user with only short alternative text, such as "...