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HTML

              
                <body> 
   
    <div id="board-outer" class="center">
        <table id="board">
            <tr class="row">
                <td id="a1"></td>
                <td id="a2"></td>
                <td id="a3"></td>
            </tr>
            <tr class="row">
                <td id="b1"></td>
                <td id="b2"></td>
                <td id="b3"></td>
            </tr>
            <tr class="row">
                <td id="c1"></td>
                <td id="c2"></td>
                <td id="c3"></td>
            </tr>
        </table>  
    </div>
   
    <div class="center button">
        <button id="playAgain">new game</button>
        
    </div>
   
    <!-- Win Alert Modal Box -->
   <div class = "winAlert">
     <div class="content">
					       <h3>YOU WIN!</h3>
       <p class="winFade">try again</p>
				    </div>
   </div> <!-- End Win Alert Modal Box -->
  
  <!-- Lose Alert Modal Box -->
   <div class = "loseAlert">
     <div class="content">
					       <h3>YOU LOSE!</h3>
       <p class="loseFade">try again</p>
				    </div>
   </div> <!-- Lose Alert Modal Box -->
  
  <!-- Tie Alert Modal Box -->
   <div class = "tieAlert">
     <div class="content">
					       <h3>IT'S A TIE!</h3>
       <p class="tieFade">try again</p>
				    </div>
   </div> <!-- Tie Alert Modal Box -->
  
  

</body>
              
            
!

CSS

              
                body {
   margin-top: 50px;
   background-color: #2F2F2F;
   font-family: 'Gochi Hand', cursive;
}

 .center {
    margin-right: auto;
    margin-left: auto;
}

 h1, h4 {
    text-align: center;
    color: #ecf0f1;
    border: 0;
}
p {
    text-align: center;
    line-height: 16pt;
    color: #666666;
}

a {
  text-decoration: none;
  font-size: 1.75em;
  color: #bbb;
  font-weight: 700;
  letter-spacing: 1px;
}
.button {
    margin-left:auto;
    margin-right:auto;
    text-align: center;
}

button {
  outline: 0;
}

#playAgain {
    font-size: 3em;;
    color: #ecf0f1;
    background-color: #2F2F2F;
    padding: 5px 15px 5px 15px;
    width: 250px;
    height: 40px;
    border: 0;
    font-family: 'Gochi Hand', cursive;
    margin-bottom: 30px;
    margin-top: 50px;
}

 #board-outer {
    height: 350px;
    width: 350px;
    overflow: hidden;
   margin-bottom: 30px;
}
#board {
    width: 354px;
    height: 354px;
    border-spacing:0;
    margin-left: -2px;
    margin-top: -2px;
    font-family: 'Gochi Hand', cursive;
}
td {
    height: 116px;
    width: 116px;
    text-align: center;
    font-size: 7em;
    border-collapse: collapse;
    border: 2px dotted #ecf0f1;
    text-transform: uppercase;
    color: #ecf0f1;
}
.x {
    width: 100%;
    height: 100%;
    background-color: blue;
}
.o {
    width: 100%;
    height: 100%;
    background-color: red;
}

/*style for hidden modal*/
.winAlert, .loseAlert, .tieAlert {
	width: 100%;
	height: 100%;
	color: #fff;
	background: #333;
	position: absolute;
	top: 0;
	left: 0;
	margin: 0;
	z-index: 1000;
	display: none;
}


.content {
	color: #ecf0f1;
	position: relative;
	height: auto;
	width: 600px;
	border-radius: 3px;
	top: 15%;
	margin: auto auto;
	
}

.content h3 {
	margin-bottom: 15px;
	padding: 0.4em;
	text-align: center;
	font-size: 4em;
	font-weight: 700;
  color: #a2dcf4;
  
}

.content p {
  margin-bottom: 25px;
  color: #ecf0f1;
  cursor: pointer;
  font-size: 2em;
}

              
            
!

JS

              
                var xWins = false;
var oWins = false;
var turn = 0;

var human = 'X'; // turn = 0
var computer = 'O'; // turn = 1

$(".loseFade").click(function(){
        $(".loseAlert").fadeOut(1000);             
});

$(".winFade").click(function(){
        $(".winAlert").fadeOut(1000);             
});

$(".tieFade").click(function(){
        $(".tieAlert").fadeOut(1000);             
});


//board variables
var a1,a2,a3,b1,b2,b3,c1,c2,c3;


//Checks the current state of the board and updates the variables.
currentBoardState = function(){
  a1 = $('#a1').html();
  a2 = $('#a2').html();
  a3 = $('#a3').html();
  b1 = $('#b1').html();
  b2 = $('#b2').html();
  b3 = $('#b3').html();
  c1 = $('#c1').html();
  c2 = $('#c2').html();
  c3 = $('#c3').html();
};

//Checks each row, column, and diagonal to see if they all contain an "X". If they do
//Xwins is set to "true" and a win message is displayed.
//Otherwise, oWins is set to "true" and a "you lose" message is displayed.
checkForWinner = function(){
  if(((a1 == "X") && (a1 == a2 && a1 == a3))||
    ((b1 == "X") && (b1 == b2 && b1 == b3))||
    ((c1 == "X") && (c1 == c2 && c1 == c3))||
    ((a1 == "X") && (a1 == b1 && a1 == c1))||
    ((a2 == "X") && (a2 == b2 && a2 == c2))||
    ((a3 == "X") && (a3 == b3 && a3 == c3))||
    ((a1 == "X") && (a1 == b2 && a1 == c3))||
    ((a3 == "X") && (a3 == b2 && a3 == c1))) {
       xWins = true;
       winModal(); 
    }
  else {
    if (((a1 == "O") && (a1 == a2 && a1 == a3))||
    ((b1 == "O") && (b1 == b2 && b1 == b3))||
    ((c1 == "O") && (c1 == c2 && c1 == c3))||
    ((a1 == "O") && (a1 == b1 && a1 == c1))||
    ((a2 == "O") && (a2 == b2 && a2 == c2))||
    ((a3 == "O") && (a3 == b3 && a3 == c3))||
    ((a1 == "O") && (a1 == b2 && a1 == c3))||
    ((a3 == "O") && (a3 == b2 && a3 == c1))) {
       oWins = true; 
       winModal();
    } else {
       if (((a1 == "X") || (a1 == "O")) && ((b1 == "X") || (b1 == "O")) && ((c1 == "X") || (c1 == "O")) && ((a2 == "X") || (a2 == "O")) && ((b2 == "X") || (b2 == "O")) && ((c2 == "X") || (c2 == "O")) && ((a3 == "X") || (a3 == "O")) && ((b3 == "X") || (b3 == "O")) && ((c3 == "X") || (c3 == "O"))) {
                //alert("It's a tie!");
                winModal();
            }
            }  
    }
  };

//Check for a winner and then displays a message
var winModal = function () {
    if (xWins == true) {
        $(".winAlert").fadeIn(1000);
    } 
    else if (oWins == true) {
            $(".loseAlert").fadeIn(1000);
        }
    else {
      $(".tieAlert").fadeIn(1000);
    }
};

// When "new game" button is clicked the board is refreshed, win variables are
// set to "false" and the newGame function is called
var startOver = $('#playAgain').click(function(){
    a1 = $('#a1').text("");
    b1 = $('#b1').text("");
    c1 = $('#c1').text("");
    a2 = $('#a2').text("");
    b2 = $('#b2').text("");
    c2 = $('#c2').text("");
    a3 = $('#a3').text("");
    b3 = $('#b3').text("");
    c3 = $('#c3').text("");
    xWins = false;
    oWins = false;
    newGame();
    window.top.location.reload();  
});

// Looking for two "x" in a row.  If it finds them...it places an "o" there.
var twoExes = function () {
    if (a1 == "" && ((a3 == "X" && a2 == "X") || (c3 == "X" && b2 == "X") || (c1 == "X" && b1 == "X"))) {
        $('#a1').text("O");
        turn = 0;
    } else {
      if (a2 == "" && ((a1 == "X" && a3 == "X") || (c2 == "X" && b2 == "X"))) {
        $('#a2').text("O");
        turn = 0;
        }
        else{
        if (a3 == "" && ((a1 == "X" && a2 == "X") || (c1 == "X" && b2 == "X") || (c3 == "X" && b3 == "X"))) {
            $('#a3').text("O");
            turn = 0;
        }
            else{
            if (c3 == "" && ((c1 == "X" && c2 == "X") || (a1 == "X" && b2 == "X") || (a3 == "X" && b3 == "X"))) {
                $('#c3').text("O");
                turn = 0;
        }
                else{
                if (c1 == "" && ((c3 == "X" && c2 == "X") || (a3 == "X" && b2 == "X") || (a1 == "X" && b1 == "X"))) {
                    $('#c1').text("O");
                    turn = 0;
        }
                    else{
                    if (c2 == "" && ((c3 == "X" && c1 == "X") || (a2 == "X" && b2 == "X"))) {
                        $('#c2').text("O");
                        turn = 0;
        }
                        else{
                        if (b1 == "" && ((b3 == "X" && b2 == "X") || (a1 == "X" && c1 == "X"))) {
                            $('#b1').text("O");
                            turn = 0;
        }
                            else{
                            if (b3 == "" && ((a3 == "X" && c3 == "X") || (b2 == "X" && b1 == "X"))) {
                                $('#b3').text("O");
                                turn = 0;
        }
                                else{
                                if (b2 == "" && ((a3 == "X" && c1 == "X") || (c3 == "X" && a1 == "X") || (b3 == "X" && b1 == "X") || (c2 == "X" && a2 == "X"))) {
                                    $('#b2').text("O");
                                    turn = 0;
        }
                                   else{ // If no opportunity to block a win...play one of these.
                                    if (b2 == "") {
                                        $('#b2').text("O");
                                        turn = 0;
                                       
                                    }
                                        else{
                                        if (a1 == "") {
                                            $('#a1').text("O");
                                            turn = 0;
                                            
                                    }
                                            else{
                                            if (c3 == "") {
                                            $('#c3').text("O");
                                            turn = 0;
                                          
                                    } 
                                                else {
                                                if (c2 == "") {
                                            $('#c2').text("O");
                                            turn = 0;
                                          
                                    }
                                                    else{
                                                    if (b1 == "") {
                                            $('#b1').text("O");
                                            turn = 0;
                                          
                                    }
                                                    }
                                                }
                                            }
                                   
                                    
                                        }
                                   }
                                }
                            }
                        }
                    }
                }
            }
        }
    }   
};

var newGame = function () {
    $('td').one('click', function (event) {
        if (turn == 0) {
            $(this).text(human);
            currentBoardState();
            checkForWinner();
            turn == 1;
            twoExes();         
            currentBoardState();
            checkForWinner();
        }
    });
};

// 
$(document).ready(function () {
    newGame();
});
              
            
!
999px

Console