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Pure CSS Tic Tac Toe

It’s supposed to be used by 2 people taking turns (click twice for the other sign).

Basic idea:

  • It uses hidden checkboxes for the states (indeterminate means empty, checked means X, not checked means O) and labels for the visible part
  • When it starts, a little script (the only js in the demo) sets the states of all checkboxes to indeterminate.
  • It uses the :checked and :indeterminate pseudo-classes and sibling combinators to change the states and show who won.
  • Once somebody clicks on a checkbox (or in this case, its label) they change it’s state from indeterminate to either checked or not checked, depending on how many times they click on it.