The <base> tab specifies the default address or default destination for all links on the page. Typically, the browser extracts the corresponding element from the URL of the current document to fill in the whitespace in the relative URL.
Using <base> tags can change this. The browser will then no longer use the URL of the current document and use the specified base URL to resolve all relative URLs.
This includes URLs in the <a>, , <link>, <form> tags. Reference two: target is to click on the link to jump to the landing page.
Popular point, is your current page link <a>, also includes , <link>, <form>, unless you specify target, such as <a heft= "" target= "_blank" > Link one </a>, otherwise it will be opened in _self (this page) according to <base href= "" target= "_self" >.
This base target= "" can also be a top, _blank, parent, or other frame name.
<href= "http://afish.cnblogs.com" target= "_top"/>
HTML base Tag Target=_parent usage Introduction