The correct way to use the <base> tag is to place it in the
section, specify the base address of all relative URLs of the page, and set the link opening method. For example: <base href="https://example.com/" target="_blank"> means that the relative link is parsed from the href as the starting point, and the link opens in a new window by default. Suitable scenarios include: 1. Unified management of multi-page resource paths; 2. Simplified configuration when deploying to sub-paths; 3. Control the link opening method. Frequently asked questions include: 1. Path error causes resource loading failure; 2. Affects anchor jump behavior; 3. SEO and compatibility risks. It is recommended that the development stage is not enabled. When deploying, decide whether to add it according to the structure, and give priority to controlling link behavior in other ways. Check for 404 errors during testing. SPA projects usually do not need to be used. In web development, the HTML5 <base>
tag is actually a very practical but easily overlooked element. Although it will not be displayed directly on the page, it can affect the loading method and link behavior of the entire website resource. If you are dealing with multi-page applications, static sites, or projects that require unified path management, it can be helpful to understand how <base>
is used.

How to use the <base>
tag correctly?
The <base>
tag is usually placed in the section of an HTML document and is used to specify the base address of all relative URLs on the page. Its basic writing is as follows:

<base href="https://example.com/" target="_blank">
The above code means:
- Relative links in all pages will be parsed from
https://example.com/
as the starting point; - All links in the page (such as the
<a></a>
tag) will open in a new window by default (becausetarget="_blank"
is set).
It should be noted that a page can only have one <base>
tag, and once set, it will affect the behavior of all relative paths within the page.

In which scenarios are suitable for <base>
?
Unified management of resource paths for multiple pages
If you are developing a multi-page website, CSS, JS and image resources are placed in a fixed directory structure. Setting a unified root path by<base>
can prevent each page from writing a full path.Simplify path configuration when deploying to subpaths
For example, if your website is deployed athttps://example.com/project/
instead of the domain name root path, setting<base href="/project/">
can make the relative path simpler without frequent prefixes.Control link opening method
If you want all external links to open in the new tab, in addition to addingtarget="_blank"
to each<a></a>
, you can also use<base>
to control it to reduce duplicate code.
What are the common questions when using <base>
?
Although <base>
is very convenient, there are some pitfalls to pay attention to in actual use:
Path error causes resource loading to fail
Once the wronghref
is set, all relative paths will be parsed based on the error basic path, which may cause CSS, JS, pictures and other resources to be unable to be found.Influence anchor jump behavior
If there is an anchor link in the page (such as#section1
), the browser may try to splice the current URL on the base path after using<base>
, causing a jump exception.Carefulness in SEO and accessibility
Although search engines can usually handle<base>
, path confusion can also affect crawler crawling. In addition, some old devices or auxiliary tools may not support<base>
well.
Some suggestions for actual use
- Before using
<base>
, make sure you are clear about the path relationships of all resources; - Try not to enable
<base>
during the development stage, and then decide whether to add it based on the server structure during deployment; - If you only want to unify the link opening method, you can consider using CSS or JS control instead of relying on
target
attribute of<base>
; - During the test, please check whether there are 404 errors caused by path changes, especially pictures and script files;
- For SPA (single-page application),
<base>
is generally not needed, but if deployed on a subpath, you can use configuring the routed base to replace it.
Basically that's it. Rational use of <base>
can make path management clearer, but it is also easy to cause global problems due to small mistakes, so be extra careful when using them.
The above is the detailed content of Using HTML5 `` element in web development. For more information, please follow other related articles on the PHP Chinese website!

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