Returns the last enabled style sheet set; this property's value changes whenever the document.selectedStyleSheetSet property is changed.
lastStyleSheetSet = document.lastStyleSheetSet
On return, lastStyleSheetSet indicates the style sheet set that was most recently set. If the current style sheet set has not been changed by setting document.selectedStyleSheetSet, the returned value is null.
document.enableStyleSheetsForSet() is called.var lastSheetSet = document.lastStyleSheetSet;
if (!lastSheetSet) {
lastSheetSet = "Sheet not yet changed";
}
console.log("The last sheet set is: " + lastSheetSet);
document.preferredStyleSheetSetdocument.selectedStyleSheetSetdocument.styleSheetSetsdocument.enableStyleSheetsForSet()
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https://developer.mozilla.org/en-US/docs/Web/API/document/lastStyleSheetSet