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Your internet connection may be unreliable. For more information about the W3C website, see the Webmaster FAQ. Help and FAQ for the Markup Validator Nothing wrong with the validator here, it just knows HTML better than you do. I clicked on an icon and ended up on this strange site! Is validation some kind of quality control? Does “valid” mean “quality approved by W3C”?
Is validity the same thing as conformance? What is the Markup Validator and what does it do? I don’t want error messages, I want you to clean up my page! My document is valid, can I use your “valid” icon? Is there a list of all available icons somewhere? Why do I see warnings about “insecure items” when viewing my page after including the icon?
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Can I modify the existing icons to create my own? I saw the “valid” icon displayed on a site but the page is invalid. Can the validator check all the pages in my site in one batch? About the Markup Validator Help me!
The author of the Web page you come from once used our service to validate that page, and the page passed validation. The author was then authorized to use the icon on that page, as a claim of validity. The icon is used as a link back to the validation service, so that the author can revalidate whenever necessary. This is why, by clicking on the icon, you followed a link to the current validation results for the page you came from. If you are curious about Markup validation you may read this help document further, or you may simply use the back button of your Web browser to come back to the page where you found the “valid” icon. Web authors to structure text, add multimedia content, and specify what appearance, or style, the result should have. As for every language, these have their own grammar, vocabulary and syntax, and every document written with these computer languages are supposed to follow these rules.
HTML languages, for all versions up to XHTML 1. 1, are using machine-readable grammars called DTDs, a mechanism inherited from SGML. A document that passes this process with success is called valid. Validity is one of the quality criteria for a Web page, but there are many others. In other words, a valid Web page is not necessarily a good web page, but an invalid Web page has little chance of being a good web page.
For that reason, the fact that the W3C Markup Validator says that one page passes validation does not mean that W3C assesses that it is a good page. This is also why the “valid ” icons should never be considered as a “W3C seal of quality”. Markup languages are defined in technical specifications, which generally include a formal grammar. A document is valid when it is correctly written in accordance to the formal grammar, whereas conformance relates to the specification itself.
The two might be equivalent, but in most cases, some conformance requirements cannot be expressed in the grammar, making validity only a part of the conformance. The Validator is sort of like lint for C. It compares your HTML document to the defined syntax of HTML and reports any discrepancies. Learn more about the Markup Validator and the languages it can validate.
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Why should I validate my HTML pages? Browsers follow the second half of this maxim by accepting Web pages and trying to display them even if they’re not legal HTML. Usually this means that the browser will try to make educated guesses about what you probably meant. That’s why you want to follow the first half of the maxim by making sure your pages are legal HTML. The best way to do that is by running your documents through one or more HTML validators. A lengthier answer to this question is also available on this site if the explanation above did not satisfy you. We’re doing our best to provide clear and reliable results as well as a good interface with the Markup Validator, but for some reason you may want to check other validators.
Page Valet, part of the Site Valet suite. Looking for validators at W3C, but not the Markup Validator? Check out the list of validators at W3C, including well-known CSS validator, link checker, etc. The Validator is based on OpenSP, an SGML parser based on James Clark’s SP SGML parser.
Read the instructions on our Feedback page. Using this service How do I use this service? Most probably, you will want to use the online Markup Validation service. The simple way to use this service to validate a Web page is to paste its address into the text area on the validator’s home page, and press the “Check” button. There are other possible uses and a few usage options, please read the user’s manual for further help with this service. If, for some reason, you prefer running your own instance of the Markup Validator, check out our developer’s documentation. The output of the Markup Validator may be hard to decipher for newcomers and experts alike, so we are maintaining a list of error messages and their interpretation, which should help.
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Make sure your document has a syntactically correct DOCTYPE declaration, as described in the section on DOCTYPE, and make sure it correctly identifies the type of HTML you’re using. If this doesn’t help, then you may be experiencing a cascade failure — one error that gets The Validator so confused that it can’t make sense of the rest of your page. Try correcting the first few errors and running your page through The Validator again. Be patient, with a little time and experience you will learn to use the Markup Validator to clean up your HTML documents in no time. Have a look at tools such as HTML Tidy and tidyp. When selected, the “Clean up Markup with HTML-Tidy” option will output a “cleaned” version of the input document in case it was not valid, done with HTML-Tidy, using the Markup Validator’s default HTML-Tidy configuration.
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The full list of “valid” icons is available on the W3C website. Many browsers display this warning when viewing documents transferred over a secure protocol such as HTTPS if the documents contain items that are transferred over a non-secure protocol such as unencrypted HTTP. W3C technology represented by the icon, and only on pages that pass validation. Note that “W3C Valid” icons are not an endorsement by the W3C of the page’s author, the substantive content of the page, nor its design. Instead, the icons are only a mechanism to identify pages that have been determined to be valid, and to easily revalidate pages as often as as they are modified. Consequently, the use of the badge is in accordance with and governed by the W3C Trademark License and Logo and Icon usage policy.
The validator’s icons are distributed under the W3C document license, which allows distribution but does not allow derivative works. We recommend that you write to the site manager and politely bring to that person’s attention that there is an inconsistency. Please note that W3C does not verify or attempt to enforce validity claims. Frequently Asked Questions No DOCTYPE Declaration Found! A DOCTYPE Declaration is mandatory for most current markup languages and without one it is impossible to reliably validate a document.
One should place a DOCTYPE declaration as the very first thing in an HTML document. For example, for a typical XHTML 1. The W3C QA Activity maintains a List of recommended Doctypes that you can choose from, and the WDG maintains a document on “Choosing a DOCTYPE”. An HTML document should be served along with its character encoding.
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The W3C I18N Activity has collected a few tips on how to do this. HTML, and this practice produces invalid markup. There are many techniques to incorporate flash in valid web pages. One of the most famous is the Flash Satay technique. Most probably, you should read the ampersand section of WDG’s excellent “common validation problems” document.
Most probably, you should read the script section of WDG’s excellent Common HTML Validation Problems document. The typo is actually a “shorthand markup” and is a valid construct in HTML, even though its use is not recommended. URL scheme Browsers and other Web agents usually send information about the page they come from, in a Referer header. The validator uses this information for a features that allows it to validate whatever page the browser last visited.