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  2. W3C Markup Validation Service - Wikipedia

    en.wikipedia.org/wiki/W3C_Markup_Validation_Service

    W3C Markup Validation Service. Tag certifying that a website has been checked for well-formed XHTML (above) and CSS (below) markup. The Markup Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check pre-HTML5 HTML and XHTML documents for well-formed markup against a document type definition.

  3. CSS HTML Validator - Wikipedia

    en.wikipedia.org/wiki/CSS_HTML_Validator

    CSS HTML Validator primarily works offline (except for link checking when it must go online), which has speed and privacy benefits compared to web-based solutions and services like the W3C Markup Validation Service. However, the user must keep the software updated unlike web-based solutions which are typically kept updated by the solution provider.

  4. Help:Markup validation - Wikipedia

    en.wikipedia.org/wiki/Help:Markup_validation

    Help:Markup validation. The W3C Markup Validation Service lets editors check web pages for conformance to HTML and XHTML standards. It is helpful for catching minor problems such as duplicate section names or citation IDs. Although most major browsers will tolerate many of the errors, and will display a document successfully even if it contains ...

  5. CSS - Wikipedia

    en.wikipedia.org/wiki/CSS

    e. Cascading Style Sheets ( CSS) is a style sheet language used for specifying the presentation and styling of a document written in a markup language such as HTML or XML (including XML dialects such as SVG, MathML or XHTML ). [1] CSS is a cornerstone technology of the World Wide Web, alongside HTML and JavaScript.

  6. Validator - Wikipedia

    en.wikipedia.org/wiki/Validator

    A validator is a computer program used to check the validity or syntactical correctness of a fragment of code or document. The term is commonly used in the context of validating HTML, [1] [2] CSS, and XML documents like RSS feeds, though it can be used for any defined format or language. Accessibility validators are automated tools that are ...

  7. HTML - Wikipedia

    en.wikipedia.org/wiki/HTML

    HTML is a markup language that defines the structure and presentation of web pages. It is one of the core technologies of the World Wide Web, along with CSS and JavaScript. HTML allows creating and formatting text, images, links, tables, forms, and other elements on a web page. Learn more about the history, syntax, and features of HTML on Wikipedia.

  8. Basic access authentication - Wikipedia

    en.wikipedia.org/wiki/Basic_access_authentication

    In the context of an HTTP transaction, basic access authentication is a method for an HTTP user agent (e.g. a web browser) to provide a user name and password when making a request. In basic HTTP authentication, a request contains a header field in the form of Authorization: Basic <credentials>, where <credentials> is the Base64 encoding of ID ...

  9. Cross-site scripting - Wikipedia

    en.wikipedia.org/wiki/Cross-site_scripting

    Security on the web depends on a variety of mechanisms, including an underlying concept of trust known as the same-origin policy.This states that if content from one site (such as https://mybank.example1.com) is granted permission to access resources (like cookies etc.) on a web browser, then content from any URL with the same (1) URI scheme (e.g. ftp, http, or https), (2) host name, and (3 ...