iframe 引用播放器自适应16:9代码

<!-- padding-top calculation is height / width (assuming 16:9 aspect ratio) -->
<div style="position: relative; padding-top: 56.25%">
  <iframe
    src="https://test.com/iframe"
    style="border: none; position: absolute; top: 0; height: 100%; width: 100%"
    allowfullscreen="true"
  ></iframe>
</div>

预览效果可看：https://jiejie.uk/blog/archives/193.html