Glossary

Accessibility terms

WCAG Web Content Accessibility Guidelines. The international standard for web accessibility, published by the W3C. ClearSight checks against WCAG 2.1 Level A and AA.

Level A / Level AA WCAG conformance levels. Level A is the minimum (most critical failures). Level AA is the standard most organizations target — it includes Level A plus additional requirements.

axe-core The open-source accessibility testing engine that powers ClearSight’s automated checks. Maintained by Deque Systems and used by major browsers’ built-in dev tools.

Screen reader Software that reads page content aloud for users who are blind or have low vision. Common screen readers: NVDA, JAWS (Windows), VoiceOver (macOS/iOS), TalkBack (Android).

Keyboard navigation Navigating a page using only a keyboard (Tab, Enter, arrow keys) without a mouse. Users with motor disabilities and screen reader users rely on this.

Color contrast ratio A measure of how distinct text is from its background. WCAG requires 4.5:1 for normal text and 3:1 for large text (18pt+ or 14pt+ bold).

Touch target An interactive element on a touch screen. WCAG 2.1 recommends touch targets be at least 44×44px to be usable by people with motor impairments.

Alt text Alternative text for images, read aloud by screen readers. Descriptive images need meaningful alt text; decorative images use empty alt (alt="").

ARIA Accessible Rich Internet Applications. A set of HTML attributes that add semantic meaning to elements for assistive technology. Example: role="button", aria-label="Close dialog".

Landmark HTML5 sectioning elements (<main>, <nav>, <header>, <footer>) or ARIA landmark roles that let screen reader users jump between sections of a page.

ClearSight terms

Scan A single accessibility check of one URL.

Crawl A full-site audit that discovers and scans every page on a domain.

Site A domain in ClearSight. One site can have many crawls over time.

Issue A single accessibility violation found on a page.

Confirmed issue An issue that automated testing has determined is definitely a WCAG violation.

Potential issue An issue that may be a violation but requires human review to confirm.

Confidence score For potential issues: how confident ClearSight is that the issue is a real violation (0–100%).

AI enrichment The step where ClearSight uses Azure OpenAI to generate plain-English descriptions and fix suggestions for each issue.