Simply master the use of horizontal line annotations and code comments in HTML

Horizontal Line
Use the <hr /> tag to draw a horizontal dividing line at the current position.
example:

Horizontal lines can effectively isolate different content parts and give people a sense of hierarchy.
hint:
Since CSS can be used to format the borders of DIV or other block elements, the horizontal line effect is often achieved by setting the width of the borders of block elements. However, the <hr /> tag cannot be completely replaced.

HTML Comments
The XHTML comment tag is a special tag. As the name suggests, it is used to comment on the content in an XHTML document. Of course, it will not be displayed in the browser. The annotation tags are as follows:

Notice:
There is an exclamation mark after the opening left bracket. Also, do not write comments in other languages ​​such as “//” or “/*”.
hint:
It is a good habit to add comments appropriately. You can use them wherever you want to comment, so that the HTML documents we write are easy to read and maintain.