Absolute path URL and relative path URL in html and subdirectory, parent directory, root directory

An absolute URL is used to represent all the content required for a specific file on the Internet. Every file on the Internet has a unique URL, which is the link that needs to be entered into the address bar when searching on a web page.

For example, to access a Baidu webpage, just enter http://www.baidu.com./ in the webpage address bar.

Once you enter a web page, when you click on other screens within it, you will notice that the link in the address bar may become very long. This is because the address of the content you clicked will use a relative URL. Relative URLs are only suitable for other directories under the web page link with the same name, and will be invalid if they enter other websites. If you want to connect to a resource in the same directory, you only need to change the file name, and the original address does not need to be changed.

1. Subdirectories

The subdirectories in the computer are easy to understand. For example, C:\ is the parent directory, C:\Windows is the subdirectory of C:\; C:\Windows\System32\ is the subdirectory of C:\Windows.

Each level of subdirectory only needs to add a slash / after the parent directory and then add the file name to form a subdirectory.

2. Parent Directory

Parent directory: This is the same as C:\Windows\System32\ in 1. C:\Windows is the parent directory of System32.

3. Root Directory

Root directory: The example is the same as above, that is, C:/ is the root directory.

The same is true for the directory in HTML. The only difference is that the root directory needs to be changed to this format: architecture + server address + file name.

Example:

http://www.wrox.com/index.html;

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