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HTML: h3 tag

February 24, 2023
7 Min Read

HTML: h3 tag

In this series of learning HTML, we will teach you how to use the HTML h3 tag with proper syntax and lots of examples. Let’s start with the HTML h3 tag.

 

Description of HTML h3 tag

The HTML h3 tag is used to define a sub-subheading on a web page. It stands for “Heading 3” and is typically used to break up the content of a page into smaller subsections with headings that are less important than h1 and h2, but more important than lower-level headings such as h4, h5, and so on.

Here’s an example of how the h3 tag might be used in HTML code:

<!DOCTYPE html>
<html>
<head>
<title>My Web Page</title>
</head>
<body>
<h1>Welcome to my Web Page</h1>
<h2>About Me</h2>
<p>This is a paragraph about me.</p>
<h3>Education</h3>
<p>These are my educational qualifications:</p>
<ul>
<li>Bachelor's degree in Computer Science</li>
<li>Master's degree in Information Technology</li>
</ul>
<h3>Work Experience</h3>
<p>These are my work experience:</p>
<ul>
<li>Software Engineer at XYZ Company</li>
<li>Product Manager at ABC Company</li>
</ul>
</body>
</html>

In this example, the h3 tag is used to define two sub-subheadings on the page: “Education” and “Work Experience”. These headings are nested within the “About Me” section and are followed by paragraphs of content that provide more information about the subsections they belong to. When this code is rendered in a web browser, the text “Education” and “Work Experience” will be displayed in a smaller font than h2, but larger than normal body text, and will help break up the page into even smaller subsections.

 

Syntax of HTML h3 tag

The proper syntax for the HTML h3 tag is as shown below:

<html>
<head>
<title>
H3 Tag Example
</title>
</head>
<body>
<section>

<p>Paragraph </p>
<h3>H3 TAG Sub-subsection Title</h3>

</section>

</body>
</html>

h6 paragraph html code

Sample Output

h6 paragraph result

Attributes

The HTML h3 tag supports a few attributes that can be used to further define and modify the appearance and behavior of the heading. Here are some of the most commonly used attributes:

  1. class: The class attribute is used to specify one or more CSS classes that will be applied to the heading. This allows you to style the heading using CSS.

Example:

<h3 class="subheading">Subheading Text</h3>
  1. id: The id attribute is used to specify a unique identifier for the heading. This can be used to link to the heading from other parts of the same page or from other pages.

Example:

<h3 id="subheading">Subheading Text</h3>
  1. style: The style attribute is used to apply inline CSS styles to the heading.

Example:

<h3 style="color: blue;">Subheading Text</h3>
  1. title: The title attribute is used to provide additional information about the heading when the user hovers over it. This information is displayed in a tooltip.

Example:

<h3 title="This is a subheading">Subheading Text</h3>

These are some of the most commonly used attributes of the HTML h3 tag. However, it’s important to note that the h3 tag has fewer attributes than the higher-level heading tags, as it is intended for less prominent headings.

Attribute Description HTML Compatibility
align Used for the text Alignment. It is deprecated in HTML 4.01 and Obsolete in HTML5.

Note on HTML h3 tag

Here are some important notes on the HTML h3 tag:

  1. The h3 tag is used to define a subheading on a web page, and it is smaller than h2 but larger than h4.
  2. The h3 tag should be used to further structure content into meaningful sections, but it should not be overused or applied indiscriminately.
  3. Headings should be used to structure content and make it more accessible to users. As such, the h3 tag should be used after the h1 and h2 tags.
  4. When using headings, it is important to use them consistently throughout the page, and to avoid skipping levels (e.g. going from h2 to h4 without using h3).
  5. Headings should be descriptive and meaningful, and should accurately reflect the content of the section they are defining. Using vague or misleading headings can confuse users and make the content less accessible.
  6. It is important to use headings for their semantic meaning, rather than just for styling purposes. Using larger font sizes or bold/italic text can achieve similar visual effects without affecting the structure and accessibility of the page.
  7. It is also important to note that headings should not be used solely for decorative or aesthetic purposes, and they should always be relevant to the content that follows.

Browser Compatibility

The HTML h3 tag has essential support with the following browsers:

  1. Chrome
  2. Internet Explorer (IE)
  3. Opera
  4. Safari (WebKit)
  5. Firefox (Gecko)
  6. Android
  7. Firefox Mobile (Gecko)
  8. Edge Mobile
  9. Opera Mobile
  10. Safari Mobile

Examples of HTML h3 tag

We will discuss the HTML h3 tag below, exploring examples of how to use the HTML h3 tag in HTML5, HTML 4.01 Transitional, XHTML 1.0 Transitional, XHTML 1.0 Strict, and XHTML 1.1.

  • HTML5
  • HTML4
  • XHTML

We will discuss the HTML h3 tag below, with some examples of using the h3 tag in HTML5, HTML 4.01 Transitional, XHTML 1.0 Strict, XHTML 1.0 Transitional, and XHTML 1.1.

  1. HTML5
  2. HTML4
  3. XHTML

 

HTML5 Document

When you create a new web page in HTML5, your HTML h3 tag might look like this:

<!doctype html>

<html>

<head>

<meta charset="UTF-8">

<title>HTML5 Example by www.home4cloud.com</title>

</head>

<body>

<h1>Heading 1</h1>

<p>This is the content that would appear under Heading 1.</p>

<h3>Heading 3</h3>

<p>This is the content that would appear under Heading 3.</p>

</body>

</html>

In this above HTML5 Document example, we have created the HTML h3 tag with the text “Heading 3” that follows the HTML h1 tag.

 

HTML 4.01 Transitional Document

If you create a new HTML webpage in HTML 4.01, your HTML h3 tag might look like this, as shown below:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<metahttp-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>HTML5 Example by www.home4cloud.com</title>

</head>

<body>

<h1>Heading 1 for home4cloud</h1>

<p>This is the content that would appear under Heading of h1 html tag</p>

<h3>Heading 3 for home4cloud</h3>

<p>This is the content that would appear under Heading of h3 html tag</p>

</body>

</html>

In this above HTML 4.01 Transitional Document example, we have created the HTML h3 tag with the text “Heading 3” that follows the HTML h1 tag.

 

 

XHTML 1.0 Transitional Document

If you create a new HTML webpage in XHTML 1.0 Transitional, your HTML h3 tag might look like this, as shown below:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />

<title>XHMTL 1.0 Transitional Example by www.home4cloud.com</title>

<html>

<head>

<metahttp-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>HTML5 Example by www.home4cloud.com</title>

</head>

<body>

<h1>Heading 1 for home4cloud</h1>

<p>This is the content that would appear under Heading of h1 html tag</p>

<h3>Heading 3 for home4cloud</h3>

<p>This is the content that would appear under Heading of h3 html tag</p>

</body>

</html>

In this above XHTML 1.0 Transitional Document example, we have created the HTML h3 tag with the text “Heading 3” that follows the HTML h1 tag.

 

 

XHTML 1.0 Strict Document

If you create a new HTML webpage in XHTML 1.0 Strict, your HTML h3 tag might look like this, as shown below:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />

<title>XHTML 1.0 Strict Example by www.home4cloud.com</title>

<head>

<metahttp-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>HTML5 Example by www.home4cloud.com</title>

</head>

<body>

<h1>Heading 1 for home4cloud</h1>

<p>This is the content that would appear under Heading of h1 html tag</p>

<h3>Heading 3 for home4cloud</h3>

<p>This is the content that would appear under Heading of h3 html tag</p>

</body>

</html>

In this above XHTML 1.0 Strict Document example, we have created the HTML h3 tag with the text “Heading 3” that follows the HTML h1 tag.

 

XHTML 1.1 Document

If you create a new HTML webpage in XHTML 1.1, your HTML h3 tag might look like this, as shown below:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />

<title>XHTML 1.1 Example by www.home4cloud.com</title>

<head>

<metahttp-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>HTML5 Example by www.home4cloud.com</title>

</head>

<body>

<h1>Heading 1 for home4cloud</h1>

<p>This is the content that would appear under Heading of h1 html tag</p>

<h3>Heading 3 for home4cloud</h3>

<p>This is the content that would appear under Heading of h3 html tag</p>

</body>

</html>

In this above XHTML 1.1 Document example, we have created the HTML h3 tag with the text “Heading 3” that follows the HTML h1 tag.

 

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