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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 (DTD). Markup validation is an important step towards ensuring the technical quality of web pages.
Cross-site scripting (XSS) [a] is a type of security vulnerability that can be found in some web applications.XSS attacks enable attackers to inject client-side scripts into web pages viewed by other users.
CSS HTML Validator (previously named CSE HTML Validator) is an HTML editor and CSS editor for Windows (and Linux when used with Wine) that helps web developers create syntactically correct and accessible HTML/HTML5, XHTML, and CSS documents by locating errors, potential problems like browser compatibility issues, and common mistakes.
ASP, PHP, HTML, CSS, ColdFusion, COBOL: Yet Another Source Code Analyzer, a plugin-based framework to scan arbitrary file types, with plugins. It integrates with other scanners, including FindBugs, PMD, and Pixy. Tool Release Free software Supported languages Notes
Cascading Style Sheets (CSS) control the presentation and style of a website. CSS uses a cascading system to resolve style conflicts by applying style rules based on specificity, inheritance, and importance. Media queries allow for adjustments to the site's layout and appearance depending on factors such as screen size and resolution.
The following user CSS may be of further help in identifying material to clean up while editing normally: lint.css (language-independent; English instructions) See also: Wikipedia:Linter § Reports
To demonstrate specificity Inheritance Inheritance is a key feature in CSS; it relies on the ancestor-descendant relationship to operate. Inheritance is the mechanism by which properties are applied not only to a specified element but also to its descendants. Inheritance relies on the document tree, which is the hierarchy of XHTML elements in a page based on nesting. Descendant elements may ...
Subresource Integrity or SRI is a W3C recommendation to provide a method to protect website delivery. Specifically, it validates assets served by a third party, such as a content delivery network (CDN). This ensures these assets have not been compromised for hostile purposes.