Accessibility & HTML Glossary
Clear, example-led definitions of the accessibility and HTML terms that show up in Rocket Validator reports.
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Accessibility
ARIA
ARIA (Accessible Rich Internet Applications) is a set of HTML attributes that add accessibility semantics such as roles, states, and…
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Accessibility
Accessibility Audit
An accessibility audit is a structured evaluation of a website or app against accessibility standards, combining automated checks with…
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Accessibility
Accessible Name
An accessible name is the text assistive technologies use to identify a UI element, derived from sources such as visible text, labels, alt…
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Accessibility
Alt Text
Alt text (alternative text) is a short written description added to an image's HTML code that conveys the image's content and function to…
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Accessibility
Color Contrast
Color contrast is the luminance difference between foreground and background colors, measured as a ratio, used to determine whether text…
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Accessibility
Focus Indicator
A focus indicator is a visible outline or style change that shows which interactive element on a web page currently has keyboard focus,…
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HTML
HTML Validation
HTML validation is the process of checking markup against standards to detect structural and syntax errors that can break rendering,…
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Accessibility
Keyboard Accessibility
Keyboard accessibility means every interactive part of a website can be reached and operated using a keyboard alone, with logical focus…
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Accessibility
Landmark Roles
Landmark roles are specific ARIA roles or HTML5 semantic elements that define the major structural regions of a web page, enabling…
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Accessibility
Live Region
A live region is an area of a web page that dynamically updates its content and communicates those changes to assistive technologies like…
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Accessibility
Screen Reader
A screen reader is assistive software that converts on-screen content into speech or braille output, allowing blind and low-vision users to…
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HTML
Semantic HTML
Semantic HTML uses elements that describe meaning and structure, such as <main>, <nav>, and <button>, so browsers and assistive…
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Accessibility
Skip Navigation Link
A skip navigation link is a hidden or visually accessible anchor link placed at the very beginning of a web page that allows keyboard and…
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Accessibility
Tab Order
Tab order is the sequence in which interactive elements on a web page receive keyboard focus as a user presses the Tab key, determined by…
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Accessibility
WCAG
WCAG (Web Content Accessibility Guidelines) is the global technical standard for making web content accessible to people with disabilities,…
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