CSSFontPaletteValuesRule: overrideColors プロパティ

<div class="hat">
  <div class="emoji colored-hat">🎩</div>
</div>
<button>色の切り替え</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";
  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 = `上書きした色: ${blueFontPaletteValuesRule.overrideColors}`;
button.addEventListener("click", (event) => {
  if (hat.style.fontPalette !== "--green") {
    hat.style.fontPalette = "--green";
    log.textContent = `上書きした色: ${greenFontPaletteValuesRule.overrideColors}`;
  } else {
    hat.style.fontPalette = "--blue";
    log.textContent = `上書きした色: ${blueFontPaletteValuesRule.overrideColors}`;
  }
});