Introduction to the use of base link tag base

<br />When you click the link, the web page address that pops up is https://www.jb51.net/web/ or https://www.jb51.net/css/, which is the address pointed to by the base link added before the files of these relative paths. If the link in the target file does not specify a target attribute, the target attribute in the base tag is used.
It is often used in frame structures, such as two frames on the left and right, to display the connections in the file in the left frame in the right frame. Just use the base tag and write its target attribute value as the right frame name, so you don't have to specify the target attribute for each link in the file in the left frame.
Other instructions for the base href tag:
1. When used, the BASE element must appear in the HEAD of the document, before any references to external sources.

2. This element is available in HTML in Microsoft® Internet Explorer 3.0 and in script in Internet Explorer 4.0.
3. This element will not be rendered.
4. This element does not require a closing tag.
5. The base tag is actually still useful. For example, <base href="_blank"> will make all links on this page open in a new page, so you don’t have to add target="_blank" to each link.
Note in IE7:
1. No additional output characters can be added before <html>. Otherwise IE7 will not parse base.
2. <base> is a link base tag, which is used to change the default parameter values of all link tags in the file. It can only be applied to the beginning of the file, between the tags <head> and </head>.

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