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HTML Tidy   
Description Web page cleaner. Checks and fixes errors in the HTML code.
Version installed Ubuntu 22.04: 5.6.0 (from the Ubuntu repositories)
Usage At the command prompt, type:
tidy file.html
(type tidy -h  for a list of all command flags).
Upgrade Notes   
Manuals and
Documentation
See the Tidy Web Page.
SIE contact Nicola Caon – – tel: 5383 – office: 1.124
Additional Info If you write the HTML code by hand, or use a WYSIWYG editor, this is a very useful program to check and validate your pages.
N.B. If you page contains errors, but nevertheless it displays correctly in your favorite browser, that is NO guarantee that it will display correctly in all other browsers too!

Other useful tools to validate your HTML page are:
W3C HTML Validation Service and W3C CSS Validation Service.