How to add class to element on canvas?

@lizzie 

To add a class to an element on a canvas, you can use the classList property of the element. First, you need to get a reference to the element in question using the canvas' getElementById or querySelector method. Then, you can call the classList.add() method to add the desired class to the element.

Here's an example of how you can add a class to an element on a canvas:

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<canvas id="myCanvas" width="200" height="100"></canvas>

<script>
  var canvas = document.getElementById('myCanvas');
  var ctx = canvas.getContext('2d');

  // Draw a rectangle on the canvas
  ctx.fillStyle = 'red';
  ctx.fillRect(10, 10, 50, 50);

  // Get a reference to the canvas element
  var element = document.getElementById('myCanvas');

  // Add a class to the canvas element
  element.classList.add('myClass');
</script>

In the example above, we first get a reference to the canvas element with the id "myCanvas". We then draw a red rectangle on the canvas using the canvas context. Finally, we add the class "myClass" to the canvas element using the classList.add() method. This will apply any CSS styles or JavaScript functionality associated with the "myClass" class to the canvas element.