Above the fold
The page area visible before scrolling. Its boundaries depend on the device and window; loading priorities should support content actually visible there.
Definition and sourcesKNOWLEDGE / FROM A TO Z
Glossary
Technology, explained clearly. Find a term, choose a letter or narrow the topic. Definitions include sources and their review date.
Terms 139 / 685
Clear filtersAbsolute URL
A URL including scheme and host, such as https://example.com/guide. It identifies the destination independently of the containing document's address.
Definition and sourcesADA (Americans with Disabilities Act)
A US law prohibiting disability discrimination in specified areas, including employment and public services. ADA is legislation; WCAG provides technical accessibility guidelines. They are not interchangeable.
Definition and sourcesALT attribute
An HTML attribute providing a text alternative for an image. It supports people using screen readers. The text depends on the image's purpose; purely decorative images normally use an empty alt. It is not a keyword list.
Definition and sourcesAMP
A project and component set for pages with constrained, controlled behaviour. AMP is neither an indexing requirement nor a guarantee of better rankings.
Definition and sourcesBack-end developer
A developer responsible for server-side application behaviour, including business logic, data access and APIs. Languages depend on the project. The role does not require mastery of every popular programming language.
Definition and sourcesBEdita
An API-oriented content management platform built with PHP and CakePHP. It separates content modelling from presentation.
Definition and sourcesBolt CMS
A PHP and Symfony-based content management system. It supports custom content types; requirements and support must be assessed for the specific version.
Definition and sourcesBootstrap
A toolkit for web interfaces, including layout grids, styles and reusable components. Bootstrap also includes JavaScript components. It accelerates development, while accessibility and performance still depend on implementation.
Definition and sourcesBreadcrumbs
Navigation showing a page's place in a site's hierarchy, such as Home / Glossary / API. It helps users reach parent sections. It need not reproduce their actual browsing history.
Definition and sourcesBrotli
A lossless compression algorithm used for web resources. Browser and server negotiate support; higher compression levels increase computational cost.
Definition and sourcesCache
Storage of data for reuse, such as a saved HTTP response. Caching reduces delays and repeated work. Expiration and invalidation matter; private responses must not be indiscriminately stored in a shared cache.
Definition and sourcesCache-Control
An HTTP header defining response storage and reuse. No-cache requires validation, while no-store prohibits storage; these directives are not interchangeable.
Definition and sourcesCanonical URL
The preferred address for duplicate or closely similar content. HTML usually expresses it with a link element using rel="canonical". Search engines treat it as a signal rather than an unconditional indexing instruction.
Definition and sourcesCAPTCHA
A mechanism reducing automated abuse through behavioural assessment or challenges. It is not infallible; accessibility and privacy need consideration.
Definition and sourcesChamilo
A learning management system providing courses, materials and assessment tools. Deployment requires access configuration and protection of learner data.
Definition and sourcesCMS (Content Management System)
Software for editing and publishing content through an administration interface. It can manage websites, blogs or other material. Some changes still require developers; a CMS does not imply unlimited editing without code.
Definition and sourcesConcrete CMS
The former name of Concrete CMS, a content system with in-context page editing. Older installations need compatibility and update-support assessment.
Definition and sourcesContao
A PHP CMS using Symfony components. It manages website content and structure; extensions have their own requirements and support lifecycles.
Definition and sourcesCookies
Small pieces of data stored by a browser for a website, used for sessions, preferences, analytics or advertising. Cookies are not programs. Consent requirements depend on purpose and applicable rules.
Definition and sourcesCoppermine Photo Gallery
A PHP application for publishing and managing photo galleries. Existing installations need checks of version, environment requirements and security updates.
Definition and sourcesCopywriting
Writing that supports a communication goal, such as explaining an offer or encouraging contact. Effective copy connects the reader's needs with concrete information. Persuasion does not justify unsupported promises.
Definition and sourcesCore Web Vitals
Core user-experience metrics: LCP, INP and CLS. Field data describes real visits, while laboratory measurements support diagnosis and comparisons.
Definition and sourcesCrocoblock
A family of WordPress JetPlugins for features such as dynamic content, filtering and forms. Supported editors depend on the product and version. The complete set does not necessarily behave identically across all builders.
Definition and sources