不常用功能

<img src='image.jpg' loading='lazy' alt='Alternative Text'> 

<a href="mailto:{email}?subject={subject}&body={content}">
  Send us an email
</a>

<a href="tel:{phone}">
  Call us
</a>

<a href="sms:{phone}?body={content}">
  Send us a message
</a>

<!-- 从11开始计数 -->
<ol start="11">
  <li>html</li>
  <li>css</li>
  <li>js</li>
</ol>

<label for="value1">Low</label>
<meter id="value1" min="0" max="100" low="30" high="75" optimum="80" value="25"></meter>
<!-- meter无需css即可展示进度等 -->

<link rel="icon" href="/favicon.ico?v=2" />

<video poster="path/to/image">