PDF: HTML, XHTML & CSS. Guia Rápido & Visual

HTML, XHTML & CSS. Guia Rápido & Visual

HTML and XHTML W3Schools

Why XHTML? Many pages on the internet contain "bad" HTML. This HTML code works fine in most browsers (even if it does not follow the HTML rules):

HTML vs XHTML Find Out The 8 Most Useful Differences

Aqui, na Parte 2 da série 'Dominando Expressões Regulares em PHP', aprenda como solucionar diversos problemas de processamento de texto difíceis com alguns operadores de expressões regulares avançados.

HTML vs XHTML Difference and parison | Diffen

HTML and XHTML are both languages in which web pages are written. HTML is SGML based while XHTML is XML based.They are like two sides of the same coin. XHTML was derived from HTML to conform to XML standards. Hence XHTML is strict when compared to HTML and does not allow user to get away with lapses in coding and structure.

The W3C Markup Validation Service

This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc. If you wish to validate specific content such as RSS Atom feeds or CSS stylesheets, MobileOK content, or to find broken links, there are other validators and tools available. As an alternative you can also try our non DTD based validator.

HTML tag W3Schools

Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java and XML. w3schools . ... Differences Between HTML and XHTML. The xmlns attribute is required in XHTML, but is invalid in HTML.