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CSS HTML Validator checks HTML/XHTML syntax, CSS, links, spelling, accessibility, JavaScript, SEO, and PHP with one pass, while DTD-based validators are more limited and cannot check HTML5. CSS HTML Validator includes a built-in scripting language (called TNPL) which allows for a high degree of customization via scripting and "user functions".
The W3C also has a CSS validator, but this is less of an issue when editing Wikipedia pages, as CSS is an option and CSS validation errors typically are due to problems with skins, not problems in individual pages.
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.
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.
Perl::Critic – A tool to help enforce common Perl best practices. Most best practices are based on Damian Conway's Perl Best Practices book. PerlTidy – Program that acts as a syntax checker and tester/enforcer for coding practices in Perl. Padre – An IDE for Perl that also provides static code analysis to check for common beginner errors.
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 ...
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Many software tools exist which can parse and attempt to correct malformed markup, among other functions. HTML Tidy is a software tool available for many platforms which can correct invalid syntax, and most invalid document structure, converting HTML-like code to HTML or XHTML.