In HTML (Hypertext Markup Language), you can change the font size of text using different methods. HTML provides several ways to modify the appearance of text on a web page, including changing the font size. Methods to change the font size in HTML, including inline CSS, embedded CSS, and external CSS.

- Inline CSS: Inline CSS refers to styling that is applied directly to an HTML element using the styleattribute. To change the font size of a text element using inline CSS, you can use thestyleattribute and set thefont-sizeproperty to the desired value. For example:
htmlCopy code<p style="font-size: 18px;">This is a paragraph with font size 18 pixels.</p>
In this example, the font-size property is set to 18px, which means the font size of the paragraph text will be 18 pixels.
- Embedded CSS: Embedded CSS refers to styling that is defined within the <style>tags in the<head>section of an HTML document. To change the font size using embedded CSS, you can define a CSS class or ID, and then apply it to the desired HTML element using theclassoridattribute. For example:
htmlCopy code<head>
  <style>
    .my-paragraph {
      font-size: 18px;
    }
  </style>
</head>
<body>
  <p class="my-paragraph">This is a paragraph with font size 18 pixels.</p>
</body>
In this example, a CSS class .my-paragraph is defined in the embedded CSS with a font-size property of 18px. The class is then applied to the <p> element using the class attribute, resulting in the desired font size for the paragraph text.
- External CSS: External CSS refers to styling that is defined in a separate CSS file and linked to an HTML document using the <link>tag. To change the font size using external CSS, you can define a CSS class or ID in the external CSS file, and then link it to the HTML document using the<link>tag. For example:
styles.css (external CSS file):
cssCopy code.my-paragraph {
  font-size: 18px;
}
index.html (HTML document):
htmlCopy code<head>
  <link rel="stylesheet" href="styles.css">
</head>
<body>
  <p class="my-paragraph">This is a paragraph with font size 18 pixels.</p>
</body>
In this example, a CSS class .my-paragraph is defined in the external CSS file styles.css, and the CSS file is linked to the HTML document using the <link> tag in the <head> section. The class is then applied to the <p> element using the class attribute, resulting in the desired font size for the paragraph text.
It’s important to note that font sizes in CSS can be specified using different units, such as pixels (px), percentages (%), ems (em), or rems (rem). The units you choose will affect how the font size scales relative to other elements on the page. The user’s browser settings. It’s recommended to use relative units like ems or rems to create more responsive designs. It adapt to different devices and user preferences.
You can also use CSS frameworks, libraries, or pre-processors to change the font size in HTML. These tools provide additional features and flexibility for managing the styles of your web pages, including font sizes.
In conclusion, changing the font size in HTML is easy.