Detailed explanation of the use of title tags and paragraph tags in XHTML

XHTML Title Overview
When we write Word documents, we often use titles, such as "Chapter 1", "1.2.1", etc. There is also the concept of title in XHTML syntax. There are 6 levels of headings defined in XHTML, namely

to

:

<h1 id="第一级标题">第一级标题</h1>  
<h2 id="第二级标题">第二级标题</h2>  
<h3 id="第三级标题">第三级标题</h3>  
<h4 id="第四级标题">第四级标题</h4>  
<h5 id="第五级标题">第五级标题</h5>  
<h6 id="第六级标题">第六级标题</h6>

Use of headings
In XHTML documents, headings are very important. Search engines use headings for your To index the structure and content of web pages, we must be good at using titles to identify our document hierarchy.
Among the titles, the first level title is the highest, and then decreases in sequence. Generally speaking, in XHTML documents, the title applies to the following places in the document (within the tag):
According to the website hierarchy:

Define the website title

Define article title
Divided according to website content:

Define website title

Define article title
< h3>Definition column title
For h4 to h6 titles that are larger than h3, they can be selected in appropriate places, such as copyright statements or disclaimer notices and other relatively important places.
Please also note that the levels must be decreasing. The level below h1 should be h2, and then h3...

Some suggestions for using titles
Since h1 names the core content of the entire page, generally h1 can only appear once (this is not absolutely the case, but it must not appear multiple times) And it is used in the most emphasized part of the article. Therefore, if for a specific content page, h1 is often used in the article title to highlight the importance of the article, such as this site:

<h1>XHTML 标题<h1>

At this time, whether the website title (website logo) uses h1 again will depend on the actual situation. It depends.
Title Usage Exercise
Open our learning document 1.html file with an editor, copy the above

to

tags into the tag:

  
<h1 id="第一级标题">第一级标题</h1>  
<h2 id="第二级标题">第二级标题</h2>  
<h3 id="第三级标题">第三级标题</h3>  
<h4 id="第四级标题">第四级标题</h4>  
<h5 id="第五级标题">第五级标题</h5>  
<h6 id="第六级标题">第六级标题</h6>  
hi~你好！
  

Save and open the 1.html file with a browser (if it is already open, click the browser refresh button to reload the document, the same below, no further details), you can view the effect of the title tag as follows:

As you can see from the example, the browser will automatically form a line break for a title (each title has its own line).

Paragraph p tag
In XHTML, a paragraph is defined through the

tag.
XHTML paragraph
Paragraph tag example:

<p>这是一个段落。</p>

In actual production work, we use a large number of

paragraph tags.
After adding a paragraph tag to the text, the browser will automatically add a paragraph break to the text. But instead of relying on the empty

to form a blank line, we should use the
line break tag.

Line break

In XHTML documents, the title or paragraph tag only provides a line break tag. If we need a blank line or multiple line breaks, we need a line break tag< ;br /> . In XHTML, hitting the Enter key to break a new line when editing Word is invalid, and the browser will ignore the new line gap generated in this way.
Example:

<p>这是一些内容</p>  
<br /><br />  
<p>这是另一些内容</p>

Since the line break tag only informs the browser that this place needs a line break, but has no substantive content, this tag does not appear in pairs, and a
only breaks the line. Once, multiple line breaks are required, please enter multiple
tags.
If the
tag is inserted in

, it will also produce a line break effect.

or
?
Although we can still achieve line breaks using
, that is the result of the browser's compatibility with the HTML4.0 specification.
In the XHTML specification, for tags that are not paired, you only need to add a space after the end of the content, and then use /> to close the tag, such as
and and other tags.
So it's
instead of
or
.

For more detailed articles on the use of title tags and paragraph tags in XHTML, please pay attention to the PHP Chinese website!