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unicode-range - CSS | MDN

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The unicode-range CSS descriptor sets the specific range of characters to be used from a font defined using the @font-face at-rule and made available for use on the current page. If the page doesn't use any character in this range, the font is not downloaded; if it uses at least one, the whole font is downloaded.

/* <unicode-range> values */
unicode-range: U+26; /* single code point */
unicode-range: U+0-7F;
unicode-range: U+0025-00FF; /* code point range */
unicode-range: U+4??; /* wildcard range */
unicode-range: U+0025-00FF, U+4??; /* multiple values */

single code point

A single Unicode character code point, for example U+26.

code point range

A range of Unicode code points. So for example, U+0025-00FF means include all characters in the range U+0025 to U+00FF.

wildcard range

A range of Unicode code points containing wildcard characters, that is using the '?' character, so for example U+4?? means include all characters in the range U+400 to U+4FF.

The purpose of this descriptor is to allow the font resources to be segmented so that a browser only needs to download the font resource needed for the text content of a particular page. For example, a site with many localizations could provide separate font resources for English, Greek and Japanese. For users viewing the English version of a page, the font resources for Greek and Japanese fonts wouldn't need to be downloaded, saving bandwidth.

In this example, we create a single <div> element, with a text string that includes an ampersand that we want to style with a different font. To make it obvious, we will use a sans-serif font, Helvetica, for the text, and a serif font, Times New Roman, for the ampersand.

In the CSS we are in effect defining a completely separate @font-face that only includes a single character in it, meaning that only this character will be styled with this font. We could also have done this by wrapping the ampersand in a <span> and applying a different font just to that, but that is an extra element and rule set.

@font-face {
  font-family: "Ampersand";
  src: local("Times New Roman");
  unicode-range: U+26;
}

div {
  font-size: 4em;
  font-family: Ampersand, Helvetica, sans-serif;
}

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