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HTML

              
                form.board
  div.boxes
    - for i in (1..9)
      input.x type='checkbox' id='x-#{i}'
    - for i in (1..9)
      input.o type='checkbox' id='o-#{i}'
    div.controls
      div.control.-x
        div.control-labels
          - for i in (1..9)
            label.x for='x-#{i}'
      div.control.-o
        div.control-labels
          - for i in (1..9)
            label.o for='o-#{i}'
    div.done
      div.lead Winner is
      div.winner
      button type='reset' Again
    div.tie 
      span It's a tie
      button type='reset' Again
    div.turn
      div.turn-x
      div.turn-o
  h1 
    span Tic
    span Tac
    span Toe

  
              
            
!

CSS

              
                $size: 80px;
$cb: 'input[type=checkbox]';
$o: '~ .o, ~ .o ~ input';

$color-x: #F38630;
$color-o: #69D2E7;
$color-border: #666666;

* {
  box-sizing: border-box
}

html,
body,
form {
  height: 100%;
}

body {
  background: #f2f2f2;
  counter-reset: turn 10;
  display: flex;
  font-family: 'Merriweather Sans', sans-serif;
  font-size: 16px;
}

.board {
  height: ($size * 3) + 2px;
  margin: auto;
  position: relative;
  width: ($size * 3) + 2px;
}

h1 {
  color: darken($color-o, 10%);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.05em;
  margin: 20px 0 -50px;
  text-align: center;
  
  span:nth-of-type(1),
  span:nth-of-type(3) {
    color: darken($color-x, 10%);
  }
}

.boxes {
  border: 1px solid $color-border;
  display: flex;
  flex-wrap: wrap;
  height: ($size * 3) + 2px;
  position: relative;
  width: ($size * 3) + 2px;
}

/**
 * Boxes
 */

#{$cb} {
  appearance: none;
  opacity: 0.01;
  position: absolute;
  z-index: 0;
  
  &.x:checked {
    counter-increment: turn -10;
  }
  
  &.o:checked {
    counter-increment: turn 10;
  }
}

@-moz-document url-prefix() {
  #{$cb}:checked {
    background: none;
  }
}

button[type='reset'] {
  border: none;
  border-radius: 3px;
  color: white;
  cursor: pointer;
  font-size: 18px;
  height: auto;
  padding: 8px 10px;
  position: static;
  width: auto;
}

label {
  background-position: center;
  background-repeat: no-repeat;
  background-size: 90%;
  border-radius: 0;
  box-shadow: inset 0 0 0 1px $color-border;
  cursor: pointer;
  height: $size;
  transition: background .2s;
  width: $size;
  
  &:hover {
    background-color: lighten($color-x, 25%);
  }
  
  &.o {
    &:hover {
      background-color: lighten($color-o, 25%);
    }
  }
}

/**
 * Checked Boxes
 */
@for $i from 1 through 18 {
  #{$cb}:nth-of-type(#{$i}):checked ~ .controls {
    $label: $i;
    $bgColor: $color-x;
    $bgImg: 'http://www.jerrylow.com/demo/ttt/ttt-x.svg';
 
    @if $i > 9 {
      $label: $i - 9;
      $bgColor: $color-o;
      $bgImg: 'http://www.jerrylow.com/demo/ttt/ttt-o.svg';
    }
    
    .control.-x label:nth-of-type(#{$label}),
    .control.-o label:nth-of-type(#{$label}) {
      background-color: $bgColor;
      background-image: url(#{$bgImg});
      background-size: 50%;
      cursor: not-allowed;
      pointer-events: none;
      z-index: 50 !important;
    }
  }
}

/**
 * Turns
 **/
.controls {
  display: flex;
  flex-wrap: wrap;
  height: 100%;
  left: 0;
  overflow: hidden;
  position: absolute;
  top: 0;
  width: calc(100% + 2ch);
  z-index: 1;
}

.control {
  &.-x {
    overflow: hidden;
    flex-grow: 1;
    height: 100%;
    width: 0;
  }
  
  &.-o {
    flex-basis: 100%;
    white-space: nowrap;
      
    &:after {
      content: counter(turn);
      display: inline;
      visibility: hidden;
    }
    
    .control-labels {
      width: $size * 3; 
    }
  }
  
  .control-labels {
    display: inline-flex;
    flex-wrap: wrap;
  }
}

.turn {
  bottom: -11px;
  display: flex;
  flex-wrap: wrap;
  left: -11px;
  overflow: hidden;
  position: absolute;
  right: -11px;
  top: -11px;
  z-index: 0;
  
  .turn-x {
    box-shadow: inset 0 0 0 10px lighten($color-x, 25%);
    flex-grow: 1;
    height: 100%;
    width: 0;
  }
  
  .turn-o {
    box-shadow: inset 0 0 0 10px lighten($color-o, 25%);
    color: lighten($color-o, 25%);
    flex-basis: 100%;
    box-sizing: border-box;
    padding-left: calc(100% - 1ch);
    
    &:before {
      content: counter(turn);
    }
  }
}

/**
 * Done
 **/
@mixin doneMessage ($doneColor, $doneChar) {
  ~ .done {
    box-shadow: 0 0 0 10px lighten($doneColor, 25%);
    border: 1px solid $color-border;
    background: rgba($doneColor, .95);
    color: darken($doneColor, 25%);
    display: flex;
    
    .winner:after {
      content: "#{$doneChar}";
      color: darken($doneColor, 35%);
    }
    
    button[type='reset'] {
      background: darken($doneColor, 15%);
    }
  }
  
  ~ .tie,
  ~ .turn {
    display: none !important;
  }
}

@mixin doneCheck($selector, $doneColor, $doneChar) {
  /**
   * ---
   **/
  #{$cb} {
    &:nth-of-type(#{$selector}):checked + :checked + :checked {
      @include doneMessage($doneColor, $doneChar);
    }

    &:nth-of-type(#{$selector}) + input + input + :checked + :checked + :checked {
      @include doneMessage($doneColor, $doneChar);
    }

    &:nth-of-type(#{$selector}) + input + input + input + input + input + :checked + :checked + :checked {
      @include doneMessage($doneColor, $doneChar);
    }
  }
  
  /**
   * |||
   */
  #{$cb} {
    &:nth-of-type(#{$selector}):checked + input + input + :checked + input + input + :checked {
      @include doneMessage($doneColor, $doneChar);
    }
    
    &:nth-of-type(#{$selector}) + :checked + input + input + :checked + input + input + :checked {
      @include doneMessage($doneColor, $doneChar);
    }
    
    &:nth-of-type(#{$selector}) + input + :checked + input + input + :checked + input + input + :checked {
      @include doneMessage($doneColor, $doneChar);
    }
  }
  
  /**
   * X
   **/
  #{$cb} {
    &:nth-of-type(#{$selector}):checked + input + input + input + :checked + input + input + input + :checked {
      @include doneMessage($doneColor, $doneChar);
    } 
    
    &:nth-of-type(#{$selector}) + input + :checked + input + :checked + input + :checked {
      @include doneMessage($doneColor, $doneChar);
    }
  }
}

@include doneCheck(1, $color-x, 'x');
@include doneCheck(10, $color-o, 'o');

.done {
  align-items: center;
  bottom: 0;
  display: none;
  flex-direction: column;
  justify-content: center;
  left: 0;
  position: absolute;
  right: 0;
  top: 0;
  z-index: 100;
  
  .lead {
    font-size: 16px;
  }
  
  .winner {
    font-size: 100px;
    font-weight: 700;
    text-transform: uppercase;
  }
}

/**
 * Tie
 */
.tie {
  align-items: center;
  background: linear-gradient(45deg, $color-x 0%, $color-x 50%, $color-o 50.1%);
  bottom: 0;
  color: white;
  display: none;
  flex-direction: column;
  font-size: 30px;
  justify-content: center;
  left: 0;
  position: absolute;
  right: 0;
  top: 0;
  z-index: 50;
  
  button[type='reset'] {
    background: #333;
    margin: 15px 0 0;
  }
}

/**
 * Tie
 **/
$tie: #{$cb + ':checked'};

@for $i from 1 to 9 {
  $tie: $tie + ' ~ #{$cb + ":checked"}';
}

#{$tie} {
  ~ .tie {
    display: flex;
  }
}
              
            
!

JS

              
                /* Yes there is a bug if you click out of the tiles after going as X -- can I fix it? I don't know! */

/* Seems like there's an issue with :focus selector in Safari and FireFox. This could be Chrome not conforming - but I see some accessibility issues for multi-input device users. Will check back */

/* UPDATE
Thanks to Roman Komarov's post http://kizu.ru/en/blog/counters-and-stones/ I was able to get around the :focus turn base issue. This is working in Chrome and even playable in FF now. Still Safari issues though. */
              
            
!
999px

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