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But dont you need js to check for the styles to see if the link is visited?

• vgel 5y ago
  No, each square the user clicks could be a checkbox that is submitted to the backend as a form when they click done.
  • kevincox 5y ago
    It could even just use CSS selectors to reveal an image or change a background image that results in a request to the backend.
    • varun_ch 5y ago
      Fortunately most browsers already have some measures to prevent that (https://developer.mozilla.org/en-US/docs/Web/CSS/Privacy_and_the_:visited_selector https://developer.mozilla.org/en-US/docs/Web/CSS/Privacy_and...), the demo avoids automating the process altogether, and relies on tricking the visitor into 'voluntarily' telling if they've visited a site.
      • kevincox 5y ago
        I meant you can use CSS on the checkbox once it is checked, there is no need to actually submit a form. I understand that you can't use CSS directly on the :visited selector.
        • varun_ch 5y ago
          Ah I see, that makes sense.