Accessibility

Noun · Development

Definitions

  1. Accessibility (a11y) is the practice of making technology usable by everyone, including people with permanent, temporary, or situational disabilities. The abbreviation a11y represents the word accessibility with 11 letters between a and y. Core techniques include providing text alternatives for images, ensuring sufficient color contrast ratios, supporting keyboard-only navigation, adding ARIA labels for screen readers, and offering captions for audio content. Testing tools like Lighthouse, axe, and WAVE help developers identify accessibility issues automatically, though manual testing with actual assistive technologies remains essential. The WCAG standard defines three conformance levels (A, AA, AAA), with AA being the most commonly targeted for compliance. Building with accessibility in mind from the start is far more efficient than retrofitting existing interfaces.

    In plain English: Making websites and apps usable by everyone, including people who are blind, deaf, or have other disabilities.

    Example: "Our accessibility audit flagged 40 missing alt attributes and zero skip-nav links."

Etymology

1990
The ADA establishes accessibility as a legal mandate in the US, influencing software design.
1999
WCAG 1.0 provides the first formal web accessibility guidelines from the W3C.
2008
WCAG 2.0 is published, becoming the global standard for accessible web content.
2018
WCAG 2.1 adds guidelines for mobile accessibility, low vision, and cognitive disabilities.
2020s
Accessibility lawsuits surge, making compliance a business imperative. Automated testing tools mature.

Origin Story

The Principle That Computing Should Exclude No One

Accessibility in computing refers to the design of systems, devices, and software so that people with disabilities can use them effectively. The concept has roots in the 1970s, when Vint Cerf, who is hard of hearing, helped shape early internet protocols like email partly because text-based communication worked for him when phone calls did not. Formal accessibility work in computing began in the 1980s. In 1986, Gregg Vanderheiden established the Trace Research and Development Center at the University of Wisconsin-Madison, one of the first labs dedicated to technology accessibility. Apple was an early corporate leader: the Macintosh included CloseView screen magnification in 1987, and the company added VoiceOver screen reading to Mac OS X in 2005. The Americans with Disabilities Act of 1990 created legal pressure, though its application to digital technology took decades to clarify. The W3C's Web Accessibility Initiative, launched in 1997, produced the Web Content Accessibility Guidelines (WCAG), which became the global standard. Today, accessibility is both a legal requirement and a design philosophy, influencing everything from color contrast ratios to voice interfaces. An estimated 1.3 billion people worldwide live with some form of disability, making accessibility one of the largest untapped opportunities in technology.

Context: Assistive technology research, 1980s

Fun fact: Vint Cerf, often called a 'Father of the Internet,' has said that email's text-based nature was partly shaped by his own hearing loss, since he preferred written communication over phone calls.

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