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Email rendering complianceReviewed September 7, 2026

What is Web font?

A web font is a font resource supplied for download rather than relying only on fonts already installed on the recipient's device.

Who this applies to#

  • Use a web font when brand typography adds value and a tested fallback preserves the message when the resource is unavailable

What Web font requires#

  • Declare the downloadable font and a fallback stack, and account for load failure or unsupported handling
CSS

The @font-face rule describes downloadable font resources for use by CSS

What this does not require#

  • Brand typography does not require a web font when a system font communicates the message clearly

Common mistakes#

  1. Omitting fallbacks
  2. Ignoring changed line breaks
  3. Assuming the font will always download

Web font checklist#

  • Confirm the license
  • Define fallbacks
  • Check load failure
  • Test priority clients

Commonly confused with#

Official sources#