By default, if you do not specify a hyperlink target attribute, open in the current window. Use head in the base can develop a hyperlink base class, all hyperlinks will inherit its properties.
<html>
<head>
<base target="_blank" />
</head>
<body>
<a href="https://weiyinfu.cn">weiyinfu.cn</a>
</body>
</html>In addition, base may also indicate href attribute, which indicates the relative links.
<base href="http://mysite/images/" />
<img src="5.gif"/>