The “H” and “T” in “HTML” stand for “hypertext”, which basically means a system of linked text.
<h2>Where to find the tutorial</h2>
<p><a href="http://www.htmldog.com">HTML Dog</a></p>
在body的中间
在同一页可以设置id
<h2 id="moss">Moss</h2>
<a href = "#moss">Go to moss</a>
