'my tic-tac-toe game if condition doesn't work

let cells = document.querySelectorAll(".cell");

let turn = "x";

cells.forEach( box => {
    box.addEventListener("click",
     () => box.classList.add("fill-" + turn));   

     if ( turn === "x" ) turn = "o";
     else turn = "x";
     
},
 { once: true}
);

#board{
  border: 2px solid red;
  width: 210px;
  height: 210px;
  margin: auto;
  
  
}

.cell{
  border: 1px solid red;
  display: block;
  background-color: rgb(241, 239, 239);
  text-decoration: none;
  width: 68px;
  height: 68px;
  float: left;
  cursor: pointer;
  font-size: 60px;
  text-align: center;
  line-height: 60px;
}

.cell:hover{
  background-color: rgb(207, 207, 207);

}

.cell.fill-x::after{
  content: "x";
  color: blue;
}

.cell.fill-o::after{
  content: "0";
  color: red;
}

<!Doctype html>
<html>
 <head>
  <title>Dooz</title>
  <meta charset="UFT-8">
  <link rel="stylesheet" href="dooz.css">
 
 </head>
 <body>
  
   <div id="board">
    <a  class="cell"></a>
    <a  class="cell"></a>
    <a  class="cell"></a>
    <a  class="cell"></a>
    <a  class="cell"></a>
    <a  class="cell"></a>
    <a  class="cell"></a>
    <a  class="cell"></a>
    <a  class="cell"></a>
   </div>

   <script src="dooz.js"></script>
 </body>
</html>

I'm learning javascript and trying to build a tic-tac-toe game. I want to create an if condition to whether choose "x" or "o" after another, but my code doesn't work probably. inside second if statement line: when it's ( turn = "o" ), it only shows "o" when it's (turn === or == "o"), it only shows "x" What's the problem and how can I fix this?

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'my tic-tac-toe game if condition doesn't work

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