JavaScript Document styleSheetSets Property

if ("styleSheetSets" in document) {
  const names = [];
  for (const sheet of document.styleSheetSets) {
    names.push(sheet);
  }
  console.log(names);
} else {
  console.log("API not available");
}

const supported = "styleSheetSets" in document;
console.log(supported);

if (supported) {
  console.log(document.styleSheetSets.length);
} else {
  console.log("API not available");
}

// Prefer this over styleSheetSets for new apps
const themes = ["light", "dark"];
console.log(themes.join(", "));

document.documentElement.classList.toggle("dark");
console.log(
  document.documentElement.classList.contains("dark")
);