reset styles of selected node's parents

lib/single-file/single-file-core.js

@@ -362,7 +362,10 @@ const SingleFileCore = (() => {
 	class DomProcessorHelper {
 		static isolateElement(parentElement, element) {
 			Array.from(parentElement.childNodes).forEach(node => {
-				if (node != element) {
+				if (node == element) {
+					node.removeAttribute("style");
+					node.style.all = "unset";
+				} else {
 					if (node.tagName != "HEAD" && node.tagName != "STYLE") {
 						node.remove();
 					}