dossier-prototyping/test.html at master · choxi/dossier-prototyping · GitHub

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<html>
  <body>
    <style>
      .window {
        width: 200px;
        height: 200px;
        border: 1px solid black;
        overflow: hidden;
        position: relative;
      }

      .grid {
        width: 1000px;
        height: 1000px;
        background-image: url("https://images.pexels.com/photos/33044/sunflower-sun-summer-yellow.jpg?auto=compress&cs=tinysrgb&h=350");
        position: absolute;
        top: 0;
        transition: top 1s linear;
      }
    </style>

    <div class="window">
      <div class="grid">
      </div>
    </div>

    <script>
      var viewport = document.getElementsByClassName("window")[0]
      var grid = document.getElementsByClassName("grid")[0]

      viewport.addEventListener("click", () => {
        grid.style.top = "-20px"
      })
    </script>
  </body>
</html>