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Showing content from http://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display below:

font-display - CSS | MDN

Baseline Widely available

The font-display descriptor for the @font-face at-rule determines how a font face is displayed based on whether and when it is downloaded and ready to use.

/* Keyword values */
font-display: auto;
font-display: block;
font-display: swap;
font-display: fallback;
font-display: optional;

auto

The font display strategy is defined by the user agent.

block

Gives the font face a short block period and an infinite swap period.

swap

Gives the font face an extremely small block period and an infinite swap period.

fallback

Gives the font face an extremely small block period and a short swap period.

optional

Gives the font face an extremely small block period and no swap period.

Note: In Firefox, the preferences gfx.downloadable_fonts.fallback_delay and gfx.downloadable_fonts.fallback_delay_short provide the duration of the "short" and "extremely small" periods, respectively.

The font display timeline is based on a timer that begins the moment the user agent attempts to use a given downloaded font face. The timeline is divided into the three periods below which dictate the rendering behavior of any elements using the font face:

• Font block period: If the font face is not loaded, any element attempting to use it must render an invisible fallback font face. If the font face successfully loads during this period, it is used normally.
• Font swap period: If the font face is not loaded, any element attempting to use it must render a fallback font face. If the font face successfully loads during this period, it is used normally.
• Font failure period: If the font face is not loaded, the user agent treats it as a failed load causing normal font fallback.

font-display = 
  auto      |
  block     |
  swap      |
  fallback  |
  optional  

@font-face {
  font-family: ExampleFont;
  src:
    url("/path/to/fonts/example-font.woff") format("woff"),
    url("/path/to/fonts/example-font.eot") format("eot");
  font-weight: 400;
  font-style: normal;
  font-display: fallback;
}

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