HTML forms use input elements. There are various different types of input element, including buttons, check-boxes, text ... hide an input element of any other type, developers can use CSS code.

As pageoneresults says in the WebmasterWorld thread: Google has a hard enough time now dealing with html/xhtml. Parsing CSS files and determining whether something is hidden or not is not a solution.

By appending just a few lines of HTML and CSS code, researcher Louis Dion-Marcil showed how an external sender could hide the very warning from an email message. This happens because email ...