First letter
A11y explained
What Is A11y?
A11y is a common abbreviation for accessibility. The number 11 represents the eleven letters between the first “a” and the final “y” in the word accessibility.
In web development, A11y is about designing and building websites, apps and digital services so that as many people as possible can perceive, understand, navigate and use them.
Practical accessibility. No false one-click compliance promises.
Accessibility
A numeronym used across web development, design and digital accessibility.
The meaning
Why is accessibility shortened to A11y?
The word accessibility has thirteen letters. Keep the first and last letters, replace the eleven letters in between with the number 11, and you get A11y.
Letters in between
Last letter
A + 11 + Y = A11y = Accessibility
More than an abbreviation
What does A11y mean in web development?
A11y is not a technology, certification or accessibility standard. It is shorthand for the broader practice of making digital experiences accessible to people with different abilities, devices and ways of interacting with the web.
Everything works without a mouse
Buttons, links, menus and forms should be usable with a keyboard and show a clear focus indicator.
Content has meaningful structure
Headings, labels, links and controls should give assistive technologies the information users need.
Images have useful alternatives
Meaningful images should include appropriate alternative text so their purpose is not lost when they cannot be seen.
Text remains easy to perceive
Text and important interface elements should have sufficient contrast and should not depend on colour alone.
Users stay in control
Animations should not create unnecessary barriers, and multimedia should provide appropriate alternatives such as captions where required.
Information is understandable
Straightforward language, predictable interfaces and helpful instructions make websites easier for more people to use.
A11y + WCAG
How are A11y and WCAG related?
They are closely related, but they do not mean the same thing.
A broad term for accessibility
A11y describes the overall practice and goal of making digital experiences accessible. It can refer to accessible design, development, content, testing and inclusive user experiences.
A technical accessibility standard
The Web Content Accessibility Guidelines provide testable success criteria for making web content more accessible.
PerceivableOperableUnderstandableRobust
Learn about WCAG 2.2 →
Clear terminology
A11y is not the same as “Ally”
The characters in A11y are the numbers 1 and 1, not two lowercase “L” characters. Because A11y visually resembles the English word “ally”, the two are sometimes confused.
A11y
Accessibility — the common shorthand used in digital accessibility and web development.
Ally
A person who supports another person, group or community. It is a different word and meaning.
For general audiences, writing out “accessibility” is often clearer. Use A11y when the meaning is already understood or explain it the first time it appears.
In practice
What does good A11y look like?
An accessible website is not defined by one widget or one automated test. Good A11y is built across design, content and code.
Use semantic HTML
Use headings, buttons, links, lists and form elements according to their intended purpose.
Support keyboard users
Visitors should be able to move through interactive content without requiring a mouse.
Provide useful alternative text
Describe meaningful images according to their purpose and avoid unnecessary alt text for decorative images.
Maintain sufficient colour contrast
Check foreground and background colours and avoid relying on colour alone to communicate meaning.
Label forms clearly
Users should understand what information each field requires and receive understandable error feedback.
Make focus visible
Keyboard users need to know which control currently has focus.
Use descriptive links
Avoid vague link text such as “click here” when a more meaningful description can be used.
Test beyond automation
Automated scanning can identify many technical issues, but it cannot judge every accessibility barrier or complete user journey.
Who benefits?
Accessibility supports many different ways of using the web.
People interact with digital services in different ways. Accessible design helps remove unnecessary barriers.
Visual disabilities
People who are blind, have low vision or have colour-vision differences.
Hearing disabilities
People who are deaf or hard of hearing.
Motor disabilities
People who may use keyboards, switches, voice input or alternative pointing devices.
Cognitive & learning disabilities
People who may benefit from clearer structure, reduced distraction and understandable content.
Accessibility is not about designing for one type of user. It is about removing unnecessary barriers.
Terms to know
Common A11y terms
A few terms appear again and again when teams work on website accessibility.
WCAG
Web Content Accessibility Guidelines
Internationally used recommendations and testable criteria for web accessibility.
ARIA
Accessible Rich Internet Applications
Attributes that can provide additional accessibility information to assistive technologies when native HTML alone is insufficient.
Screen reader
Assistive technology
Software that presents digital content through speech or other output, often used by blind and visually impaired users.
Alternative text
Image alternative
A textual alternative that communicates the relevant purpose or content of an image.
Keyboard navigation
Input method
Using a website with keys such as Tab, Shift+Tab, Enter, Space and arrow keys instead of relying on a mouse.
Focus indicator
Visible state
A visible indication of which interactive element currently receives keyboard input.
A11y ≠ legal status
Does A11y mean a website is legally compliant?
No. A11y is simply shorthand for accessibility. It is not a certification or legal status. Likewise, adding an accessibility widget alone does not automatically make a website WCAG-, BFSG-, EAA- or ADA-compliant.
Real accessibility requires attention to the underlying website — including its code, content, design, forms, navigation and user journeys.
How Welcoma helps
Accessibility tools for visitors — and actionable information for website owners.
Welcoma combines tools that can improve the browsing experience for visitors with accessibility testing designed to uncover issues that still need to be corrected in the website itself.
A widget can help users. It cannot replace accessible design, development and testing.
Visitor accessibility menu
Give visitors controls for text, contrast, reading support, keyboard use and other accessibility preferences.
Accessibility profiles
Provide predefined combinations of settings for different accessibility needs.
WCAG scanner
Identify accessibility issues, prioritise findings and understand what should be addressed in the website.
Accessibility guidance
Learn why an issue matters and what can be done to improve it.
FAQ
Frequently asked questions about A11y
What does A11y stand for?
A11y stands for accessibility. The number 11 represents the eleven letters between the first “a” and final “y” in the word accessibility.
Why is accessibility called A11y?
A11y is a numeronym — an abbreviation in which a number replaces letters within a word. It is widely used in web development and digital accessibility communities.
Is A11y the same as WCAG?
No. A11y is shorthand for accessibility in general. WCAG is a set of guidelines and testable success criteria used to evaluate web accessibility.
Is A11y only for people with disabilities?
People with disabilities are central to accessibility work, but accessible design can also help people experiencing temporary, situational or age-related limitations.
Does an accessibility widget make my website accessible?
A widget can provide useful controls and improve some aspects of the user experience, but it cannot repair every accessibility issue in a website’s underlying code or content.
How can I test my website for A11y?
Start with automated accessibility testing to identify detectable issues, then add keyboard testing, content review and manual testing. Complex websites may also benefit from assistive-technology and user testing.
Is A11y important for SEO?
Accessibility and SEO are different disciplines, but some good practices overlap — for example meaningful page structure, descriptive links and useful image alternatives. Accessibility should primarily be implemented for people, not simply as an SEO technique.
Start with your website
How accessible is your website?
Find accessibility issues and understand what should be improved — with practical guidance instead of false one-click compliance promises.