How to set the relative path of hyperlinks in HTML--the parent directory and the subordinate directory

In HTML: /indicates the directory where the source file is located, at the top level of the directory. /.. /represents the upper parent directory of the directory where the source file resides, similar to the upper directory.

If chap1.html in d:php\tutor\student1\math\chap1.html,student1.html in d:php\tutor\ Student1.html, the chap1.html accesses student1.html to write:

<a href = ". /.. /student1.html ">student1.html</a>

　　

Refer to the Subordinate directory file, directly write the path of the subordinate directory file.

If student1.html in d:php\tutor\student1.html,chap1.html in d:php\tutor\student1\math\chap1.html, Then access chap1.html in student1.html to write:

<a href = "student1/math/chap1.html" >chap1.html</a>

How to set the relative path of hyperlinks in HTML--the parent directory and the subordinate directory