HTML VALIDATOR (based on Tidy and OpenSP)

1. HTML Tidy is a helpful program that tries to help people to correct their HTML errors. It finds HTML errors and classifies them in 3 categories:
   • errors: HTML errors that Tidy cannot fix or understand.
   • warnings: HTML errors that Tidy can fix automatically
   • (optional) accessibility warnings: HTML warnings for the 3 priority levels defined in W3c WAI
     
     
2. OpenSP, is SGML parser, is a  professional algorithm. It is the same program running inside http://validator.w3.org/. And now, you can embed it in Firefox !

FIREFOX 57 + CHROME

Download: Firefox: Addons

Download: Chrome: extensions

• There is a new tab in Developer tools: Html Validator.
• The validation happens only when the "Developer Tools" is open.
• The extension uses a new version of Tidy 5 compiled from C to Javascript. It works now on all platforms.
• It works in Chrome

FIREFOX 48

FIREFOX 8.0

FIREFOX 7.0

FIREFOX 6.0

FIREFOX 5.0

FIREFOX 4.0

FIREFOX 3.6 and below

IMAGES

If you want to see some images, click on one of the both images below.

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Firefox + HTML Validator / tooltip in the browser statusbar	Firefox  + HTML Validator / Page source

FEATURES

• The HTML validation is done when browsing. The result is shown on the form of an icon in the status bar.
• If the page contains HTML frames or iframes, you can see the validation result of the main page and the frames.
  

• The detail of the validation can be seen when looking the source of the page.
• Tidy validates the HTML code and displays the result like a compiler for a programming language.
• The validation is done based on the source and not by making a second request to the Web Server.
  
• The screen is splitted in 3 parts. Above the source of the HTML, and below, the list of the errors and the explanation of the error.
• The explanation of the errors are a personal effort to make HTML specification understandable. Because I must admit, that not all HTML errors are easy to understand. For example,
  

• It is also possible to ask HTML Validator to propose a corrected version of the page in HTML or convert it to XHTML.
• You can compare the cleanup version and the original version in 2 tabs. (source and preview)
  

ADVANTAGES

• the data is not sent to a 3rd party server
    - So, there is no problem with firewall to validate dynamically generated HTML that are in intranets. What you can not do with web validators, except by saving the file and upload it.
    - You have also not the problem of people not daring to validate their pages by using other people machines.
• the validation is done automatically and just by looking the page.
  
• it is easy to validate dynamic page. Dynamic pages are only available in the browser and you validate when you see them.
  
• it is a gui. So, the validation is faster and the interface has more possibilities.
• Just press CTRL+U (page view) and all yours errors are there.It is done based on the page source and without accessing a second time the web server to get the HTML source.
• If it is your website you try to correct, just press CTRL+R in the view source to revalidate the result after correcting the errors.
  

HOW DOES IT WORK

• Some XUL and javascripts files for the screens and presentation of the results.
• Some HTML pages for the help on the HTML errors and warnings
• A dynamic C library, .DLL or .SO, that contains:
  - The original Tidy source code
  - The original OpenSP source code
  - Some C code to glue make tidy XPCOM compliant and give the ability to call Tidy from Javascript and XUL.

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