Resources ⮞ HTML & xHTML

This gives information about the HTML and xHTML hypertext markup languages.

Note : unless otherwise indicated, ‘HTML’ on this page denotes both HTML and xHTML.

HTML Specifications 

HTML recommendations (i.e. specifications) are issued by the W3C (World-Wide Web Consortium). The specifications are:

Note : no browser completely and correctly implements any version of HTML; modern browsers, however, come very close.

Note : some modern browsers implement the specifications more correctly if a DOCTYPE is specified in the HTML file [more⮞.

HTML Validators 

Validators check to see whether HTML and xHTML files are syntactically correct, i.e. are written in accordance with the specifications.

Some validators are:

Note : links to various validators and code checkers can be found on the WDG and DMOZ sites.

Caution : some vendors sell code checkers but wrongly call them validators. [more⮞

HTML Code Checkers 

Code checkers (sometimes called syntax checkers or lint programs) check for problems in HTML code. Some checks are similar to those that validators do. Other checks are beyond the scope of validators, e.g. checking for missing files, missing anchor tags, missing end tags, broken links, browser compatibility problems, browser accessibility problems, etc.

Some HTML code checkers are:

Note : links to various validators and code checkers can be found on the WDG and DMOZ sites.

Caution : some vendors sell code checkers but wrongly call them validators. [more⮞

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