Cross-browser compatibility
A website's ability to work correctly in agreed browsers. Pixel-identical appearance is not essential; accessible content and key functionality matter.
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 filtersCSS (Cascading Style Sheets)
A stylesheet language describing document presentation, including colour, typography and layout. It works with HTML and differs from programming languages such as JavaScript. The cascade determines which declarations apply.
Definition and sourcesCSS framework
Rules, tools or components that help style interfaces, offering ready-made elements or utility classes. A CSS framework does not replace HTML or guarantee a correct layout without proper implementation.
Definition and sourcesCTA (Call to Action)
A prompt for a specific action, such as booking a call or downloading a guide. It can be a button, link or text. It should explain the next step and deliver what it promises.
Definition and sourcesCumulative Layout Shift
A visual-stability metric measuring unexpected layout shifts. Scores reflect shift size and distance; reserving image space helps reduce the problem.
Definition and sourcesDate format
A convention for representing dates and times. The value 2026-10-14T10:00:00+02:00 includes a date, time and UTC offset. RFC 3339 supports data exchange; a local display format may differ.
Definition and sourcesDDoS (Distributed Denial of Service)
An attack using traffic from multiple sources to exhaust resources and disrupt legitimate access. Defence may require upstream filtering and distributed infrastructure. An application firewall alone cannot handle every kind of DDoS.
Definition and sourcesDigital accessibility
Designing services usable by people with different disabilities. It covers content, keyboard operation, assistive technology and understandability.
Definition and sourcesDolphin PHP
A name associated with BoonEx's Dolphin social-network platform. Older deployments require separate verification of support and update availability.
Definition and sourcesDropdown menu
A menu opened by activating a control. It needs a clear name, keyboard support and correct focus management; hover alone is insufficient.
Definition and sourcesDrupal
An open-source CMS with modules, content modelling and access control. Environment requirements and support schedules matter when choosing a version.
Definition and sourcesE-commerce
Commerce where goods or services are ordered electronically, usually online. Payment and delivery need not occur online. E-commerce includes both business transactions and consumer sales.
Definition and sourcese107
An open-source PHP CMS offering themes and extensions. Check requirements and update availability before using an older installation.
Definition and sourcesElementor
A visual WordPress page editor using components and design settings. Features vary by version, plan and extensions. A builder simplifies editing but does not remove the need to test responsiveness, accessibility and speed.
Definition and sourcesEuropean Accessibility Act
EU Directive 2019/882 setting accessibility requirements for selected products and services. Obligations and exemptions must be assessed under national implementation.
Definition and sourcesFacebook Pixel (Meta Pixel)
Now Meta Pixel: a tool recording selected website events for Meta advertising and measurement. Mobile apps use separate integrations. Deployment requires attention to privacy, consent and the quality of transmitted data.
Definition and sourcesFavicon
A small website-identification icon in browsers and some search results. Format, dimensions and availability must fit the destination's requirements.
Definition and sourcesFirst Contentful Paint
Time until content such as text or an image first renders. FCP does not indicate that the whole page or its main element is ready.
Definition and sourcesFirst Input Delay
A historical metric of the delay before handling the first interaction. INP replaced it in Core Web Vitals in March 2024.
Definition and sourcesFlynax
Software for building classifieds websites and directories. Features and integrations depend on edition, add-ons and licence terms.
Definition and sourcesFront-end developer
A developer building the part of an application that people interact with. Web work typically uses HTML, CSS and JavaScript. Responsibilities also include interface behaviour, accessibility and operation across devices.
Definition and sourcesFull-stack developer
A developer working on both user interfaces and server-side application logic. Skills depend on the technology stack. Full-stack does not mean knowing every language or replacing every specialist on a team.
Definition and sourcesGDPR (RODO)
EU Regulation 2016/679 governing personal-data protection, processing principles, duties and individual rights. Consent is one lawful basis, not a compulsory basis for every processing activity.
Definition and sourcesGoogle AdSense
A Google service enabling publishers to earn from displaying ads. Revenue and conditions depend on the programme's model and policies. AdSense serves publishers; Google Ads serves advertisers.
Definition and sources