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The Markup Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check HTML and XHTML documents for well-formed markup. Markup validation is an important step towards ensuring the technical quality of web pages; however, is not a complete measure of web standards conformance. -- Wikipedia

The W3C Markup Validation Service

W3C's easy-to-use markup validation service, based on SGML and XML parsers.
https://validator.w3.org/ - Details - Similar

HTML5 - Wikipedia

WHATWG's Ian Hickson (Google) and David Hyatt (Apple) produced W3C's first public working draft of the specification on 22 January 2008. 2
https://en.wikipedia.org/wiki/HTML5 - Details - Similar

CSS - Wikipedia

This is an accepted version of this page
https://en.wikipedia.org/wiki/CSS3 - Details - Similar

CSS - Wikipedia

The name cascading comes from the specified priority scheme to determine which declaration applies if more than one declaration of a property match a particular element. This cascading priority scheme is predictable.
https://en.wikipedia.org/wiki/CSS - Details - Similar

HTML - Wikipedia

Web browsers receive HTML documents from a web server or from local storage and render the documents into multimedia web pages. HTML describes the structure of a web page semantically and originally included cues for its
https://en.wikipedia.org/wiki/HTML - Details - Similar

Web design - Wikipedia

Since the start of the 21st century, the web has become more and more integrated into people's lives. As this has happened the technology of the web has also moved on. There have also been significant changes in the way
https://en.wikipedia.org/wiki/Web_design - Details - Similar

World Wide Web Consortium - Wikipedia

The organization tries to foster compatibility and agreement among industry members in the adoption of new standards defined by the W3C. Incompatible versions of HTML are offered by different vendors, causing inconsisten
https://en.wikipedia.org/wiki/World_Wide_Web_Consortium - Details - Similar

تصميم مواقع الويب - ويكيبيديا

يتكون أي موقع على الإنترنت من ثلاث عناصر أساسية (اسم الموقع وعنوانه - الخادم الذي توضع عليه ملفات الموقع - ملفات الموقع نفسه التي تعرض للمستخدم). تتطلب عملية تصميم أي موقع التعامل مع هذه العناصر الثلاث لأنها تكمل بعضها ل
https://ar.wikipedia.org/wiki/%D8%AA%D8%B5%D9%85%D9%8A%D9%85_%D9%85%D9%88%D8%A7%D9%82%D8%B9_%D8%A7%D9%84%D9%88%D9%8A%D8%A8 - Details - Similar

Apache OpenOffice - Official Site - The Free and Open Productivity Sui

The official home page of the Apache OpenOffice open source project, home of OpenOffice Writer, Calc, Impress, Draw and Base.
http://www.openoffice.org/ - Details - Similar

Apache OpenOffice - Official Site - The Free and Open Productivity Sui

The official home page of the Apache OpenOffice open source project, home of OpenOffice Writer, Calc, Impress, Draw and Base.
https://openoffice.org/ - Details - Similar

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