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Standards of the used languages

In designing a website, you can follow three different levels of W3C standards dictated by different degrees of severity.

You can easily test your site by clicking on it with the second mouse button and choosing "View source" (see source) and look if in the first few lines of code is at least present the term "Frameset", "Transitional" or better yet "Strict".

This does not guarantee adhering to quality, because we must also verify that the same code has been met (see "validation"). To verify the correctness of the code written, we have automated tools to validate, made available through the W3C Markup Validation Service, Validator.w3.org site to validate HTML, and site Jigsaw.w3.org to validate the css.
Standard Levels:
0) No level of quality standards adhered to.
1) The level of standard Frameset, which is also the most permissive, since it accepts the 'use of different tag obsolete and yet allowed to split the window into frames  (subwindows) Therefore, it is destined to disappear from the web.
2) A higher level of quality standards and Transitional, which is most recommended in the renovation of an existing website that does not follow the current standards, but nevertheless, I accept 'use of Some deprecated tag.
3) The highest level of quality standard and strict, that all sites should follow the new generation, it is the most punctilious and severe, does not admit any kind of deprecated tags and no lack of respect for the rules of W3C, requires a complete separation of content from style, by obtaining a code already optimized by itself, without any kind of error, ie a code clean.
Example of code that complies with the W3C XHTML Strict:
! DOCTYPE html PUBLIC "- / / W3C / / DTD XHTML 1.0 Strict / / EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd" html xmlns = "http://www .w3.org/1999/xhtml "lang =" en "xml: lang =" en "

In building a website, it is recommended and sometimes required, to follow specific rules to meet the standards drawn up by the W3C.
The World Wide Web Consortium (W3C) creates Web standards Its purpose is to bring the Web to its maximum potential.
At the address http://www.w3c.it/w3cin7punti.html. You can find a summary of the objectives and strategic principles of the W3C.

So it's fitting that the webmaster knows that any code or language has its own rules, which allow to avoid making mistakes of syntax of the code or of rules that would compromise the length and the compliance of the website.

Do not follow these standards facilitates very much the work of the webmaster, but at the expense of the site, which will be full of errors and therefore obsolete, with no possibility of being projected into the future of the web.
We explain why: not writing a "CLEAN" php, html, css or javascript code can also get beautiful and attractive sites of both graphics and content, even it is much easier to obtain satisfactory results in a short time, using the "visual" programs, the so-called WYSIWYG who are able to realize a site within hours, acting in a completely visual and automatically creating the source code. And even if the webmaster of this work may seem apparently attractive, do not think to get in your hands a professional and durable website, it will be just a nice showcase not fully functional and with a bad shoulder construction.