CSS font-size-adjust Property

Posted in CSS Tutorial

Updated on Oct 03, 2024

By Mari Selvan

👁️ 28 - Views

⏳ 4 mins

💬 1 Comment

Photo Credit to CodeToFun

🙋 Introduction

The font-size-adjust property in CSS is used to improve the legibility of text by adjusting the font size based on the aspect value of the first-choice font.

This property ensures that the x-height (height of the lowercase "x") remains consistent, even when fallback fonts are used. This can be particularly useful when the fallback fonts have different aspect ratios, leading to more visually consistent text rendering.

💡 Syntax

The syntax for the font-size-adjust property is straightforward. You can specify a numeric value, none, or initial.

Syntax

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element {
  font-size-adjust: value;
}

Here, value can be a number representing the aspect value or none to disable the adjustment.

🎛️ Default Value

The default value of the font-size-adjust property is none, meaning no adjustment is applied and the font size is rendered normally based on the font size setting.

🏠 Property Values

Value	Description
none	No font-size adjustment is applied.
number	A positive number that represents the aspect value (ratio of the font's x-height to the font size).

📄 Example

In this example, we'll adjust the font size based on an aspect value of 0.5.

index.html

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS font-size-adjust Example</title>
  <style>
    p {
      font-family: "Arial", sans-serif;
      font-size-adjust: 0.5;
    }
  </style>
</head>
<body>
  <h1>Font Size Adjust Example</h1>
  <p>
    This paragraph's font size is adjusted to maintain a consistent x-height even when fallback fonts are used.
  </p>
</body>
</html>

🖥️ Browser Compatibility

The font-size-adjust property is supported in most modern browsers, including the latest versions of Chrome, Firefox, Safari, Edge, and Opera. However, it is always a good practice to test your website across different browsers to ensure compatibility.

🎉 Conclusion

The font-size-adjust property is a valuable tool for web developers aiming to maintain consistent text legibility across different fonts.

By adjusting the font size based on the aspect value of the first-choice font, you can ensure that text remains readable and visually consistent, even when fallback fonts are used. Experiment with different aspect values to see how this property can enhance the readability of your web content.