user: Can you please write a simple static website in there is space for 3 horizontal image slots and 1 slider with the following details:
1. the left most image slot and the rightmost image slot are inputs - the user needs to be able to upload an image 
2. the middle image slot is an output and is the weighted average of the pixel value of the two uploaded images (it is kept blank until both images were uploaded)
3. the slider is located directly below the middle image slot goes from 0 to 1 and determines the weight of the leftmost image in the average. the weight of the rightmost image is (1 - slider_weight)

assistant: <!DOCTYPE html>
<html>
  <head>
    <style>
      .image-slot {
        width: 33.33%;
        height: 300px;
        float: left;
        text-align: center;
        position: relative;
        border: 1px solid black;
      }
      .image-slot input[type="file"] {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        opacity: 0;
      }
      .image-slot img {
        max-width: 100%;
        max-height: 100%;
      }
      .slider {
        clear: both;
        width: 100%;
        margin-top: 20px;
      }
    </style>
  </head>
  <body>
    <div class="image-slot">
      <input type="file" id="left-image" onchange="uploadImage(this)">
      <label for="left-image">
        <img id="left-image-preview" src="">
      </label>
    </div>
    <div class="image-slot" id="middle-image-slot">
      <img id="middle-image" src="">
    </div>
    <div class="image-slot">
      <input type="file" id="right-image" onchange="uploadImage(this)">
      <label for="right-image">
        <img id="right-image-preview" src="">
      </label>
    </div>
    <div class="slider">
      <input type="range" id="slider" min="0" max="1" step="0.01" value="0.5" onchange="updateMiddleImage()">
    </div>

    <script>
      const leftImage = document.getElementById("left-image-preview");
      const rightImage = document.getElementById("right-image-preview");
      const middleImage = document.getElementById("middle-image");
      const slider = document.getElementById("slider");
      let leftImageData;
      let rightImageData;

      function uploadImage(input) {
        const reader = new FileReader();
        reader.onload = function() {
          const image = new Image();
          image.src = reader.result;
          image.onload = function() {
            const canvas = document.createElement("canvas");
            canvas.width = image.width;
            canvas.height = image.height;
            const context = canvas.getContext("2d");
            context.drawImage(image, 0, 0);
            if (input.id === "left-image") {
              leftImage.src = reader.result;
              leftImageData = context.getImageData(0, 0, image.width, image.height);
            } else if (input.id === "right-image") {
              rightImage.src = reader.result;
              rightImageData = context.getImageData(0, 0, image.width, image.height);
            }
            updateMiddleImage();
          };
        };
        reader.readAsDataURL(input.files[0]);
      }

      function updateMiddleImage() {
        if (!leftImageData || !rightImageData) return;

        const weight = slider.value;
        const canvas = document.createElement("canvas");
        canvas.width = leftImageData.width;
        canvas.height = leftImageData.height;
        const context = canvas.getContext("2d");
        const middleImageData = context.createImageData(leftImageData.width, leftImageData.height);

        for (let i = 0; i < middleImageData.data.length; i += 4) {
          middleImageData.data[i] =
            weight * leftImageData.data[i] + (1 - weight) * rightImageData.data[i];
          middleImageData.data[i + 1] =
            weight * leftImageData.data[i + 1] + (1 - weight) * rightImageData.data[i + 1];
          middleImageData.data[i + 2] =
            weight * leftImageData.data[i + 2] + (1 - weight) * rightImageData.data[i + 2];
          middleImageData.data[i + 3] =
            weight * leftImageData.data[i + 3] + (1 - weight) * rightImageData.data[i + 3];
        }

        context.putImageData(middleImageData, 0, 0);
        middleImage.src = canvas.toDataURL();
      }
    </script>
  </body>
</html>