Favicon Emoji

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<link rel="icon" data-emoji="🛰" type="image/png">

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const favicon = document.querySelector("link[rel=icon]");

if (favicon) {
  const emoji = favicon.getAttribute("data-emoji");

  if (emoji) {
    const canvas = document.createElement("canvas");
    canvas.height = 64;
    canvas.width = 64;

    const ctx = canvas.getContext("2d");
    ctx.font = "64px serif";
    ctx.fillText(emoji, 0, 64);

    favicon.href = canvas.toDataURL();
  }
}