What?: A validator that checks the correction of markup for HTML, XHTML, CSS, XML and other markup languages
Why?: It promotes clean, correct markup. Also, for people who are learning HTML and CSS from scratch, it is a great learning tool. Did you know that you shouldn't use heading tags like <h1>, <h2>, etc. inside the paragraph <p></p> tags? I didn't know for a long time (because the code worked in all the browsers I've tried!) until I started making a habit to validate my code.
Link?: W3C Validator Service is the main HTML validator but there are other validators including the CSS Validation Service and more validation services.
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