To correctly load custom fonts, you need to use @font-face to declare and pay attention to format compatibility, path and CORS settings. 1. Use @font-face to define the font name, source and style; 2. Provide both .woff2 and .woff formats to ensure browser compatibility; 3. Set correct cross-domain headers to solve external loading problems; 4. Verify the font file path to avoid 404 errors; in terms of performance optimization, 5. Load the font weight as needed to reduce the request; 6. Generate a subset of fonts to reduce the volume; 7. Use font-display:swap to avoid text invisibility; Common problems include cache old files → clear cache to view, file path error → check the Network panel, inconsistent spelling → check the font-family name, character not supported → generate font packages containing commonly used Chinese characters.

Using custom CSS fonts is actually not difficult, but many people tend to ignore some key points during operation, resulting in font loading failure or website performance affected. This article mainly talks about several practical steps and precautions, so that you can use custom fonts on the web page smoothly.

How to correctly load custom fonts

To use a custom font, you must first declare the font through the @font-face rule. This rule requires you to provide information such as font name, source (URL), and font style.

 @font-face {
  font-family: 'MyCustomFont';
  src: url('myfont.woff2') format('woff2'),
       url('myfont.woff') format('woff');
  font-weight: normal;
  font-style: normal;
}

Then you can use it like using system fonts:

 body {
  font-family: 'MyCustomFont', sans-serif;
}

There are a few details to note:

• Format support : It is best to provide both .woff2 and .woff formats to be compatible with more browsers.
• Cross-domain problem : If you load font files from other domain names, the server must set the correct CORS header.
• Path Correctness : Make sure the font file path is correct, otherwise the font will not be loaded.

Performance optimization tips for custom fonts

Although custom fonts can make the website more beautiful, if not handled properly, it will affect the page loading speed. Here are some common optimization suggestions:

• Loading on demand : Load only the word weights you need (such as 400 and 700), instead of loading all thicknesses and italics at once.
• Use Subset : If the website uses only English or a small amount of Chinese, you can generate a subset of fonts to reduce volume.
• Font loading strategy : You can consider using font-display: swap; to avoid the problem of text invisibility.

 @font-face {
  font-family: 'MyCustomFont';
  src: url('myfont.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

In this way, even if the font has not been loaded, the browser will first display the alternate font and wait until the custom font is loaded before replacing it.

Frequently Asked Questions and Solutions

Sometimes the font doesn't seem to be effective, but it may actually be caused by the following reasons:

• The browser caches old font files → Clear cache or try to view in traceless mode
• Font file is not uploaded correctly or the path is wrong → Check the Network panel in the developer tool to see if it is 404
• Font name spelling inconsistent → Make sure font-family in @font-face is exactly the same as the name when used
• Some special characters are not supported → If it is Chinese, you may need to specially generate a font package containing commonly used Chinese characters.

Basically that's it. Custom fonts may seem simple, but a slight oversight in details may lead to display abnormalities or affect user experience. As long as you pay attention to the path, format, and performance, you can generally apply it smoothly.

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