JavaScript Document preferredStyleSheetSet Property

if (document.preferredStyleSheetSet) {
  console.log(
    "The preferred style sheet set is: " + document.preferredStyleSheetSet
  );
} else {
  console.log("There is no preferred style sheet.");
}

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

if (supported) {
  console.log(JSON.stringify(document.preferredStyleSheetSet));
} else {
  console.log("API not available");
}

// Prefer this over preferredStyleSheetSet for new apps
document.documentElement.classList.toggle("dark");
console.log(
  document.documentElement.classList.contains("dark")
);