Use multiple @font-face rules in CSS

Assuring cross-device compatibility and top-tier performance

Navigating browser compatibility and file formats

While dancing with @font-face, remember to spin multiple formats that ensure a cross-device embrace. Encompass diverse source files in your src property to enable a widespread user engagement. Contemporary browsers primarily support WOFF and WOFF2 formats, with WOFF2 owning the dance floor due to better compression 🕺.

@font-face {
  font-family: 'OptimizedFont';
  src: url('optimized-font.woff2') format('woff2'),
       url('optimized-font.woff') format('woff');
  font-weight: normal;
  font-style: normal; /* Normalize to optimise */
}
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Optimizing font weight-lifting 🏋️‍♀️

In the web development arena, where speed is the champion 🥇, optimizing font loading is essential. Harness techniques such as font subsetting to trim down file sizes or font loading APIs to control how the fonts behave. Consider font-display to manage the situation when fonts behave like introverts, reducing the flash of unstyled text (FOUT) or flash of invisible text (FOIT).

Backup dancers: Fallback fonts

Much like a famous band has backup singers, always have web-safe backup fonts in your font-family group, ready to jump in and save the day when the primary font can't make it to the stage 🎤.

.body-text {
  font-family: 'CustomFont', Arial, sans-serif; /* Always go with a plan B(Arial, sans-serif here)! */
}
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Responsiveness: the crowd-pleaser

Test and ensure readability across various devices and audience sizes. Choose audience-friendly CSS units like em, rem, and %'s that let fonts scale conveniently with the screen size, much like a charismatic conductor.

Efficiently Managing font variations

Using font-weight and style as an organizing toolkit

Ensure your font closet is well-organized by distinguishing different font files (weights and styles) in separate @font-face rules. Your font-weight and font-style in the @font-face should mirror their respective usage in CSS selectors to maintain fashion-forward consistency 💼.

@font-face {
  font-family: 'VariationFont';
  src: url('variation-font-regular.woff2') format('woff2');
  font-weight: normal; /* Normal, but never boring */
}

@font-face {
  font-family: 'VariationFont';
  src: url('variation-font-thin.woff2') format('woff2');
  font-weight: 100; /* Thin but not skinny */
}
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Assigning specific typefaces: Customizing user experience

Serving a customized font dish for UI components like headers, paragraph text, and buttons leads to a unique and engaging user experience, much like fresh dinner at a 5-star restaurant 💻.

#branding { font-family: 'VariationFont', sans-serif; font-weight: 300; }
.article-content { font-family: 'VariationFont', serif; font-weight: normal; }
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Testing and validation: the final pit-stop 🛑

Validation is always important. Especially after executing your @font-face commands, visually verify the implementation across different browsers and devices. Ensure each font variation is parading as expected.