Returns the stylesheet that is including this one, if any.
objRef = stylesheet.parentStyleSheet
// find the top level stylesheet
if (stylesheet.parentStyleSheet) {
sheet = stylesheet.parentStyleSheet;
} else {
sheet = stylesheet;
} This property returns NULL is the current stylesheet is a top-level stylesheet or if stylesheet inclusion is not supported.
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https://developer.mozilla.org/en-US/docs/Web/API/StyleSheet/parentStyleSheet