Writing correct code

Validation documentation is intended not only to ensure that the code complies with the HTML, to eliminate these all errors and comments on the document. Meanwhile, the formation of a specific culture coding can significantly reduce or even get rid of viable faults. Like  a experience is form of learning of specifications and typical blunders developers, which should be avoided.

Code errors typically occur for the following reasons:

·         the site is not specified <! DOCTYPE>;

·         typo (misspelled tag or attribute);

·         not a required attribute of the tag;

·         used tag or attribute that is not included in the specification;

·         incorrect embedding tags.

Further analyze these errors in detail

 Empty <! DOCTYPE>

Element <! DOCTYPE> is located in the first line of code of the document and tells the browser how to interpret the code and display this web page. The difference between a page with <! DOCTYPE> and without it can be very significant, to the same validator first checks for the presence of this element in the code.

Errata

Obviously, the easiest to correct typographical error occurs because, when allowed misspelling required tag. After validating the type of error is issued and the line number in the code where it is, so it remains only to change to the correct value.