HTML Tidy is an excellent little widget for checking that HTML conforms to the W3C HTML spec and fixing errors as well a clening up indentation etc. It has nothing to do with Perl per se. As to examples there are many. For example Netscape/Mozilla is very particular about closing table tags. If you forget a </table> or have extra ones then really odd stuff will happen or the page will simply fail to display. To generate your own examples take some HTML, run it through tidy and RTFO where O = Output and the rest has the usual meaning.

cheers

tachyon

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