使用CSS的font-size属性可灵活控制HTML字体大小，支持内联、内部和外部样式表，推荐使用外部CSS文件以实现多页面统一管理，并根据设计需求选择px、em、rem或%等单位。

To change font size in HTML, you can use CSS (Cascading Style Sheets) rather than relying on outdated HTML attributes. Modern web development favors using CSS for styling, including font size. Here are the most common and effective ways to adjust font size.

Using the style attribute (inline CSS)

You can set font size directly on an HTML element using the style attribute with the font-size property.

This method is quick for testing or one-off changes but not ideal for large sites since it mixes style with content.

Using internal CSS (within

Add a block inside the section of your HTML file to define font sizes for specific elements or classes.

  <style>
    .small-text {
      font-size: 12px;
    }
    h1 {
      font-size: 24px;
    }
  </style>


  <p class="small-text">This uses the small-text class.</p>
  <h1>This heading is styled globally.</h1>

This keeps styles separate from individual elements and works well for single-page websites.

Using external CSS file

Create a separate .css file and link it to your HTML document. This is best for multi-page sites and consistent design.

<!-- In your HTML -->
<link rel="stylesheet" href="styles.css">
<p>/<em> In styles.css </em>/
.content {
font-size: 18px;
}
.sidebar h3 {
font-size: 14px;
}</p>

External stylesheets make maintenance easier and ensure uniformity across pages.

Common font size units

Different units affect how text scales. Choose based on your layout needs:

• px (pixels): Fixed size, predictable but not scalable in all user settings.
• em: Relative to the parent element’s font size. Useful for nested elements.
• rem: Relative to the root () font size. Great for consistent scaling.
• %: Percentage of the parent’s font size. Works well in responsive design.

Basically, use CSS with font-size to control text size. Whether inline, internal, or external, CSS gives you full control. Pick the right unit based on flexibility and design goals.

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