-

.

defines the largest title.

Defines the smallest heading.

This is a heading

Tips: The browser will automatically Add blank lines before and after. h1 serves as the main heading (the most important), followed by h2 (the next most important), then h3, and so on. Tip: By default, HTML will automatically add an extra blank line before and after block-level elements, such as paragraphs and heading elements.

-

The align attribute is deprecated in HTML4/5. Please use CSS instead. The title supports event attributes and global attributes

Set title alignment:

CSS syntax:

Method 1:

<!DOCTYPE html>  
<html>  
<body>  
<h1 style="text-align:center">This is heading 1</h1>  
<h2 style="text-align:left">This is heading 2</h2>  
<h3 style="text-align:right">This is heading 3</h3>  
<h4 style="text-align:justify">This is heading 4</h4>  
</body>  
</html>

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Method 2:

<!DOCTYPE html>  
<html>  
<head>  
<style>  
h1 {text-align:center}   
h2 {text-align:left}   
h3 {text-align:right}   
</style>  
</head>  
  
<body>  
<h1>This is heading 1</h1>  
<h2>This is heading 2</h2>  
<h3>This is heading 3</h3>  
</body>  
</html>

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Property Value	Description
left	Left aligned title (default)
right	right aligned title
center	center aligned title.
justify	The title has reasonable margins.

HTML: Horizontal Line The

tag creates a horizontal line in an HTML page. The

hr element can be used to separate content.

This is a paragraph

Tip: Using horizontal lines (

tags) to separate sections in an article is one way (but not the only way). HTML5 does not support the

align attribute. Please use CSS instead.

In HTML 4.01, the align attribute of

is deprecated. The

align attribute specifies the alignment of horizontal lines.

Note: Unless the width attribute is set to less than 100%, the align attribute will have no effect.

CSS syntax (IE and Opera):

CSS syntax (Firefox, Chrome, and Safari):

CSS syntax (cross-browser):

noshade attribute	value	Description css syntax format
align	left center right	HTML5 is not supported. HTML 4.01 is deprecated. Specifies the alignment of the element
noshade	noshade	HTML5 does not support it. HTML 4.01 is deprecated. Specifies that the color of the element is rendered as a solid color.
size	pixels	HTML5 is not supported. HTML 4.01 is deprecated. Specifies the height of the element.
wid	pixels %	HTML5 is not supported. HTML 4.01 is deprecated. Specifies the width of the element.

<!DOCTYPE html>  
<html>  
<body>  
<p>This is some text. This is some text. This is some text.</p>  
<hr style="width:50%;text-align:left;margin-left:0">  
<p>This is some text. This is some text. This is some text.</p>  
</body>  
</html>

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HTML: 注释

可以将注释插入 HTML 代码中，这样可以提高其可读性，使代码更易被人理解。浏览器会忽略注释，也不会显示它们。

注释是这样写的：

注释：命令行最后的两个正斜杠（//）是 JavaScript 注释符号。这确保了 JavaScript 不会执行 --> 标签。

除了在源文档中有非常明显的作用外，许多 Web 服务器也利用注释来实现文档服务端软件特有的特性。这些服务器可以扫描文档，从传统的 HTML/XHTML 注释中找到特定的字符序列，然后再根据嵌在注释中的命令采取相应的动作。这些动作可能是简单的包括其他文件中的文本（即所谓的服务器端包含，server-inside include），也可能是复杂地执行其他命令去动态生成文档的内容。

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