HTML Css iframe 嵌入網頁 

<iframe width="560" height="315" src="https://www.youtube.com/embed/--f9xAkdrbo?si=9xoIoFpABdCUkxdV" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>
在記事本或word編輯純文字網頁，
然後使用瀏覽器打開。
瀏覽器扮演程式解譯器或直譯器的功能
header標題，Iframe框架frame英文字，width寬度，height高度，src=source來源，title頭銜
style="border: 10px red solid; text-align: center;
<style>
#grad1 {
  height: 200px;
  background-color: red; /* For browsers that do not support gradients */
  background-image: linear-gradient(red, yellow);
}
</style>
<div id="grad1"></div>

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