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function styleExistsInSheet(styleText, sheet) {
for (let rule of sheet.cssRules) {
if (styleText == rule.cssText)
return true;
if (rule instanceof CSSImportRule) {
if (rule.styleSheet && styleExistsInSheet(styleText, rule.styleSheet))
return true;
}
}
return false;
}
function styleExists(styleText) {
for (let sheet of document.styleSheets) {
if (styleExistsInSheet(styleText, sheet))
return true;
}
return false;
}