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1. Glossary

   301 Redirect

   A 301 redirect is a permanent, server-side redirect that automatically sends visitors and search engines from an old URL to a new one; Google treats it as a signal that the new address shoul …

   glossar › web-performance-technik › weiterleitung-301
2. Glossary

   404 Error Page

   A 404 error page is the page served when a requested URL does not exist – because of a typo, a deleted page or an outdated link – and it should return the actual HTTP status code 404. Redire …

   glossar › web-performance-technik › fehlerseite-404
3. Glossary

   A/B Testing

   A/B testing is a controlled experiment in which two variants of a page or an element are shown to different user groups at the same time in order to measure which version performs better aga …

   glossar › analytics-conversion-optimierung › ab-testing
4. Glossary

   Accessibility Act (BaFG)

   The Accessibility Act (BaFG) is Austria's implementation of the European Accessibility Act; it has applied since 28 June 2025 and covers companies providing one of the services exhaustively …

   glossar › digitale-barrierefreiheit › barrierefreiheitsgesetz-bafg
5. Glossary

   Accessibility Overlays (Criticism of Overlay Widgets)

   Accessibility overlays are JavaScript widgets added on top of an existing website that claim to make it accessible automatically, for example through font-size sliders, contrast switches or …

   glossar › digitale-barrierefreiheit › accessibility-overlay-kritik
6. Glossary

   Accessibility Statement

   An accessibility statement is a page documenting the current accessibility status of a digital service, its known limitations and a way to contact the operator with feedback. For public sect …

   glossar › digitale-barrierefreiheit › barrierefreiheitserklaerung
7. Glossary

   Accessibility Testing Tools (axe, WAVE, Lighthouse)

   Accessibility testing tools such as axe, WAVE and Lighthouse are the best-known automated checkers for testing websites against technical WCAG failures. Among them, axe (Deque) runs as a bro …

   glossar › digitale-barrierefreiheit › barrierefreiheit-testing-tools
8. Glossary

   Accessible Authentication & CAPTCHA Alternatives

   Accessible authentication is the WCAG 2.2 requirement (success criterion 3.3.8, level AA) that a login or sign-up process must not depend on a pure cognitive function test – remembering a pa …

   glossar › digitale-barrierefreiheit › barrierefreie-authentifizierung
9. Glossary

   Accessible Forms

   Accessible forms are designed so that they can be operated entirely by keyboard, are understandable with screen readers and communicate errors clearly – requirements that follow, among other …

   glossar › digitale-barrierefreiheit › barrierefreie-formulare
10. Glossary

    Accessible Name

    The accessible name is the name under which a control reaches assistive technology: what a screen reader announces and what speech input accepts as a command. It is not chosen but computed b …

    glossar › digitale-barrierefreiheit › accessible-name