JavaScript How do I resize the html <canvas> dynamically using Javascript? resize html canvas,resize html canvas element,html resize canvas

I was wondering how I can make my canvas resize along with my browser window? As it is right now, using innerWidth and innerHeight, it will only size to the initial browser width and height. How do I make it expand with the browser?

Edit: Is there a way to do this without clearing the canvas?

JS

  canvas.onmousemove = draw;
       var ctx = canvas.getContext('2d');
       var video = document.createElement("video");
       video.setAttribute("src", "some_video.mp4");
       video.autoplay = true;
       var img2 = new Image;
       img2.src = "some_image.png";
           ctx.canvas.width = window.innerWidth;
           ctx.canvas.height = window.innerHeight;

        function draw(e){
            var rect = canvas.getBoundingClientRect();
           var x = e.clientX-rect.left-img2.width/2;
           var y = e.clientY-rect.top-img2.height/2;
           ctx.drawImage(video, x, y, 830, 644);
           ctx.drawImage(img2, x, y, img2.width, img2.height);
  }
Answer:1

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