Avoid HTML form spam using CSS
So simple we laughed out loud! A very short article and answer to a big problem by Klaus Kjeldsen on using CSS to stop the spam.
The basic idea is to make an extra dummy input text field in your form, and using CSS to make it invisible to the real human users.
Thereby, if a post is sent to your php script handling the request and this extra text field contains information, you know that the submit must be spam, and the script can ignore the post.

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