Write code that is clear and logical. Be detailed in alt text and image descriptions, and at each step consider users who experience your product through alternative technologies.
Think of code hierarchy when structuring your content. Be sure screen readers and keyboard-only users can access interactive elements in a logical and predictable order via tabbing. Begin with the header, followed by the main navigation, then page navigation (from left to right, top to bottom), and end with the footer. Keyboard users should encounter an intentional experience that is comparable to the experience of mouse users.
Use native HTML elements as much as you can. These elements have built-in accessibility benefits. They inform screen readers what they are and what they do, and standard interactive elements, such as a button, include keyboard functionality. Aside from making a page accessible, native HTML is easier to develop and maintain, better on mobile, and improves search engine optimization.
When adding content, consider cognitive disabilities, anyone whose native
language isn’t the language your content is written in, and screen readers. When
possible, avoid dashes, abbreviations, acronyms (at least the first time), and
table layouts if a table is not needed. If abbreviating, use the native
<abbr /> element with title attribute.
"9 to 5" "November" <abbr title="November">Nov</abbr>
Consider visually impaired people when labeling elements. Make sure there is textual context for screen readers.
Incorrect<a>Read more about pricing</a>
Always specify table headers with
<th /> elements, and make sure they stand
scope attributes if necessary to specify if they are headers for
rows or columns. Utilize alternative text along with tables for visually
<caption /> is preferred, but
<table /> summary works too.
<table summary="Names and Ages of My Coworkers"><caption>Names and Ages of My Coworkers</caption><thead><tr><th scope="col">Firstname</th><th scope="col">Lastname</th><th scope="col">Age</th>
Consider visually impaired users when including data visualizations. Consider accompanying visuals with a data table as an alternative for users who rely on screen readers. Also consider color choices for color-blind users.
Every image that is not decorative must include
alt text with a meaningful
description of the image. If the image is decorative, use an empty
attribute; otherwise the screen reader will read the whole image URL if the
alt is left out.
Give decorative images an empty `alt` attribute.<img src="puppy.jpg" alt="Picture of a sleeping puppy in cup" />
<img src="puppy.jpg" alt="" />
Provide closed-captioning with videos or transcriptions of audio files.
<video controls><source src="example.mp4" type="video/mp4" /><source src="example.webm" type="video/webm" /><track kind="subtitles" src="subtitles_english.vtt" srclang="en" /></video>
Use SVG’s instead of font icon libraries.
<svg width="80" height="10"><line class="line" x1="200" y1="0" x2="0" y2="0" /></svg>
ARIA (Accessible Rich Internet Application) roles convey the intent or meaning of an element to assistive technology. This helps users navigate when they can’t see the layout and provides further context about different functionalities.
Landmark roles identify regions in a page, and act much like native HTML tags would when it comes to semantics. Signpost roles describe other information about a given element’s functionality on a page. These are especially helpful when building complex, custom interfaces or to reinforce semantics in native HTML elements.
Signpost roles<nav role="navigation"></nav><main role="main"></main>
<div role="banner">This is a banner.</div><div role="tabgroup"><div role="tab"></div></div><div role="combobox"></div><div role="slider"></div><button role="button"></button>
You can style a page feature to fit your design, but don’t change it to the point that it doesn’t look or behave as expected.
Add styling to tabbable elements on hover and focus, so that keyboard-only users can have a clear visual of where they are navigating. Never suppress the focus indicator altogether.
When hiding content from a screen reader, consider source order. Use
visibility: hidden, along with
display: none in your CSS.
Double up mouse-specific events with other events for keyboard-only users.
const foo = document.querySelector('.foo-class');foo.onmouseover = someFunction();foo.onmouseout = anotherFunction();foo.onfocus = someFunction();foo.onblur = anotherFunction();