<svg width="600" height="400">
  <mask id="svgmask1">
    <polygon fill="#ffffff" points="200 0, 400 400, 0 400"></polygon>
  </mask>
  <image xmlns:xlink="https://laptrinhtudau.com/wp-content/uploads/2022/01/img_5terre.jpg" xlink:href="https://laptrinhtudau.com/wp-content/uploads/2022/01/img_5terre.jpg" mask="url(#svgmask1)"></image>
</svg>

<h3>Ảnh gốc:</h3>
<img src="https://laptrinhtudau.com/wp-content/uploads/2022/01/img_5terre.jpg" alt="Cinque Terre" width="600" height="400">