副標題是在HTML中用於組織和結構化網頁內容的文字元素。副標題通常用於分割大塊文本，並為使用者提供清晰的資訊層次結構。副標題通常使用HTML中的"H2"、"H3"、"H4"、"H5"或"H6"標籤建立。這些標籤表示標題的級別，H1是最高級別的標題，H6是最低級別的副標題。
使用HTML新增子標題
HTML是一種用於在網頁上結構化和格式化內容的標記語言。 HTML的一個重要方面是能夠創建標題和副標題來組織和結構化文字。在本文中，我們將討論使用HTML新增副標題的各種方法。
Approach 1: Using the "H" tags
This is the most common way to create headings and subheadings in HTML. These tags range from H1 to H6, with H1 being the highest level heading and H6 being the lowest. For creating a subheading, we mostly the H2, H3use the H2, mostly we , H4, H5, or H6 tags. For example, to create a subheading using the H3 tag, you would use the following code −
<h3>This is a subheading</h3>
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Example
This example shows the first method how to add sub-heading in HTML.
<html>
<head>
<title>Adding Subheading Using HTML</title>
<style>
body{
background-color:#d1d0b4;
}
</style>
</head>
<body>
<h1>This is a Main Heading</h1>
<h2>This is a Sub Heading</h2>
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s.</p>
</body>
</html>
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Approach 2: Using the "P" tag with CSS
Second Method to create subheadings in HTML is by using the "P" tag and styling it with CSS. This method is useful if we want to create a subheading that is not a traditional heading. For doing this, woulding that is not a traditional heading. For doing this, would would use "P" tag and give it a class or ID that you can use to apply CSS styles. For example, to create a subheading using the p tag, you would use the following HTML and CSS code −
#CSS
#
.subheading {
font-size: 24px;
font-weight: bold;
}
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HTML
<p class="subheading">This is a subheading</p>
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Example
This example shows the second method how to add sub-heading in HTML.
<html>
<head>
<title>Adding Subheading Using HTML</title>
<style>
div {
margin: auto;
height: 250px;
width: 500px;
padding-left:10px;
background-color: #d1d0b4;
border: 2px solid #000000;
}
.subheading {
font-size: 24px;
font-weight: bold;
}
</style>
</head>
<body>
<div>
<h1>This is a Main Heading</h1>
<p class="subheading">This is a Sub Heading</h2>
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s.</p>
</div>
</body>
</html>
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使用CSS的"Div"標籤的方法
A third method for creating subheadings in HTML is by using the "Div" tag and styling it with CSS. This method is similar to the "P" tag method.
Example
This example shows the “div” tag method how to add sub-heading in HTML.
<html>
<head>
<title>Adding Subheading Using HTML</title>
<style>
div {
margin: auto;
height: 200px;
width: 450px;
padding-left:10px;
background-color: #2596;
bder: 2px solid #000000;
border-radius:10px;
}
.subheading {
font-size: 24px;
}
</style>
</head>
<body>
<div>
<h1>This is a Main Heading</h1>
<p class="subheading">This is a Sub Heading</h2>
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s.</p>
</div>
</body>
</html>
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結論
使用HTML有多種方法可以新增副標題。 "H"標籤，帶有CSS的"P"標籤和帶有CSS的"Div"標籤都是有效的方法。重要的是要注意，標題和副標題應該用於組織和結構化網頁內容，而不僅僅是為了樣式。
以上是如何使用HTML新增子標題？
To translate this question into Chinese, it would be:
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