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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/CSSFontPaletteValuesRule/overrideColors below:

CSSFontPaletteValuesRule: overrideColors property - Web APIs

Baseline Widely available

The read-only overrideColors property of the CSSFontPaletteValuesRule interface is a string containing a list of color index and color pair that are to be used instead. It is specified in the same format as the corresponding override-colors descriptor.

A string containing a comma-separated list of color index and color pair

This example first defines a few at-rules, among them two @font-palette-values. As these rules live in the last stylesheet added to the document, the palette will be the second CSSRule returned by the last stylesheet in the document (document.styleSheets[document.styleSheets.length-1].cssRules).

<div class="hat">
  <div class="emoji colored-hat">🎩</div>
</div>
<button>Toggle color</button>
<pre id="log"></pre>

@font-face {
  font-family: "Noto Color Emoji";
  font-style: normal;
  font-weight: 400;
  src: url("https://fonts.gstatic.com/l/font?kit=Yq6P-KqIXTD0t4D9z1ESnKM3-HpFabts6diywYkdG3gjD0U&skey=a373f7129eaba270&v=v24")
    format("woff2");
}

.emoji {
  font-family: "Noto Color Emoji", emoji;
  font-size: 3rem;
}

@font-palette-values --blue {
  font-family: "Noto Color Emoji";
  override-colors:
    3 rgb(1 28 193),
    4 rgb(60 124 230);
}

@font-palette-values --green {
  font-family: "Noto Color Emoji";
  override-colors:
    3 rgb(28 193 1),
    4 rgb(34 230 1);
}

.colored-hat {
  font-palette: --blue;
}

const log = document.getElementById("log");
const button = document.querySelector("button");
const hat = document.querySelector(".colored-hat");
const rules = document.styleSheets[document.styleSheets.length - 1].cssRules;
const greenFontPaletteValuesRule = rules[3];
const blueFontPaletteValuesRule = rules[2];
log.textContent = `Overridden colors: ${blueFontPaletteValuesRule.overrideColors}`;

button.addEventListener("click", (event) => {
  if (hat.style.fontPalette !== "--green") {
    hat.style.fontPalette = "--green";
    log.textContent = `Overridden colors: ${greenFontPaletteValuesRule.overrideColors}`;
  } else {
    hat.style.fontPalette = "--blue";
    log.textContent = `Overridden colors: ${blueFontPaletteValuesRule.overrideColors}`;
  }
});

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