Accessibility

Noun · Development

Definitions

  1. Accessibility in technology refers to the design and development of products, websites, and applications so they can be used by people with disabilities, including visual, auditory, motor, and cognitive impairments. The Web Content Accessibility Guidelines (WCAG) provide the international standard, organized around four principles: perceivable, operable, understandable, and robust. Practical measures include providing alt text for images, ensuring keyboard navigation, maintaining sufficient color contrast, adding captions to video, and using semantic HTML. Accessibility is a legal requirement in many jurisdictions under laws like the ADA in the United States and the European Accessibility Act. Beyond compliance, building accessible software expands the potential user base and often improves the experience for all users. Screen readers, voice controls, and switch devices are common assistive technologies that accessible design supports.

    In plain English: Making websites and apps usable by everyone, including people with disabilities — ensuring screen readers work, colors have enough contrast, and everything can be navigated by keyboard.

  2. A numeronym — the number 11 represents the eleven letters between 'a' and 'y' in 'accessibility.' Part of a family of tech numeronyms including i18n (internationalization), l10n (localization), and k8s (Kubernetes).

    Example: 'Our a11y audit found 47 WCAG violations. We're starting with the critical ones: missing alt text and broken keyboard navigation.'

    Source: numeronym / notation

Etymology

1990
The Americans with Disabilities Act (ADA) is signed into law, establishing accessibility as a legal requirement in the US.
1997
The W3C launches the Web Accessibility Initiative (WAI), beginning formal web accessibility standards.
1999
WCAG 1.0 is published, providing the first comprehensive guidelines for accessible web content.
2008
WCAG 2.0 introduces the POUR principles (Perceivable, Operable, Understandable, Robust).
2010s
The numeronym 'a11y' gains wide adoption. Accessibility shifts from compliance checkbox to core design principle.

Origin Story

The Numeronym That Made the Web for Everyone

A11y is a numeronym for 'accessibility,' formed by taking the first letter 'a,' the last letter 'y,' and replacing the 11 letters in between with the number 11. This shorthand convention (similar to i18n for internationalization and l10n for localization) became popular in the web development community in the early 2000s as developers and advocates pushed for websites that could be used by people with disabilities. The broader accessibility movement in computing dates back to the 1980s, when pioneers like Gregg Vanderheiden at the University of Wisconsin began researching how technology could serve people with disabilities. A major milestone came in 1999 when the World Wide Web Consortium (W3C) published the first Web Content Accessibility Guidelines (WCAG 1.0). The a11y numeronym itself gained traction in the Twitter era, where character limits made abbreviations valuable, and the accessibility community rallied around the #a11y hashtag. The term now represents an entire discipline encompassing screen reader compatibility, keyboard navigation, color contrast, captioning, and more. Legal requirements have also driven adoption: the Americans with Disabilities Act and similar laws worldwide have been interpreted to cover websites, leading to thousands of accessibility lawsuits and making a11y a business imperative, not just an ethical one.

Context: Web development community, early 2000s

Fun fact: The numeronym convention (like a11y and i18n) originated at Digital Equipment Corporation in the 1980s, where engineers used 'i18n' as internal shorthand for internationalization.

Related Terms