Simply master the usage of horizontal line annotations and code comments in HTML_HTML/Xhtml_Web page production

Horizontal Line
Use the

---

tag to draw a horizontal dividing line at the current location.
Example:

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1. <p>Main contentp >
2. <hr />
3. <p>Bottom contentp> 

Horizontal lines can effectively isolate different content parts and give people a sense of hierarchy.
Tips:
Since the borders of DIV or other block elements can be formatted and displayed through CSS, many times the width of the border of the block element is set to achieve the effect of a horizontal line, but < The hr /> tag still cannot be completely replaced.

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

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1. >
2. An example:
3. <div id="nav" >

Note:
There is an exclamation mark after the opening left bracket. In addition, do not write comments in other languages ​​such as "//" or "/*".
Tips:
It is a good habit to add comments appropriately and can be used wherever you want to comment so that the HTML documents we write are easy to read and maintain.