improved remove hideen elemnts implementation

lib/single-file/doc-helper.js

@@ -64,7 +64,7 @@ this.docHelper = this.docHelper || (() => {
 				ignoredTags = ignoredTags.concat("SCRIPT");
 			}
 			if (win) {
-				markHiddenCandidates(win, doc.body, markerRemovedContent, new Set(), ignoredTags, new Map());
+				markHiddenCandidates(win, doc.body, false, markerRemovedContent, new Set(), ignoredTags);
 				markHiddenElements(win, doc.body, markerRemovedContent);
 				markBackdropBackground(doc, win, markerRemovedContent);
 			}
@@ -107,23 +107,21 @@ this.docHelper = this.docHelper || (() => {
 		}
 	}
 
-	function markHiddenCandidates(win, element, markerRemovedContent, removedCandidates, ignoredTags, cacheElementsHidden) {
-		const elements = Array.from(element.childNodes).filter(node => node.nodeType == win.Node.ELEMENT_NODE);
-		elements.forEach(element => markHiddenCandidates(win, element, markerRemovedContent, removedCandidates, ignoredTags, cacheElementsHidden));
-		if (elements.length) {
-			const hiddenCandidate = !elements.find(element => !removedCandidates.has(element));
-			if (hiddenCandidate) {
-				if (hiddenElement(win, element, ignoredTags, cacheElementsHidden) && element instanceof win.HTMLElement) {
+	function markHiddenCandidates(win, element, elementHidden, markerRemovedContent, removedCandidates, ignoredTags) {
+		const elements = Array.from(element.childNodes).filter(node => node instanceof win.HTMLElement);
+		elements.forEach(element => markHiddenCandidates(win, element, elementHidden || testHiddenElement(win, element), markerRemovedContent, removedCandidates, ignoredTags));
+		if (elementHidden && !ignoredTags.includes(element.tagName)) {
+			if (elements.length) {
+				const hiddenCandidate = !elements.find(element => !removedCandidates.has(element));
+				if (hiddenCandidate) {
 					removedCandidates.add(element);
 					elements.forEach(element => {
-						if (element instanceof win.HTMLElement) {
-							element.setAttribute(markerRemovedContent, "");
-						}
+						element.setAttribute(markerRemovedContent, "");
 					});
 				}
+			} else {
+				removedCandidates.add(element);
 			}
-		} else if (hiddenElement(win, element, ignoredTags, cacheElementsHidden)) {
-			removedCandidates.add(element);
 		}
 	}
 
@@ -135,43 +133,19 @@ this.docHelper = this.docHelper || (() => {
 		}
 	}
 
-	function hiddenElement(win, element, ignoredTags, cacheElementsHidden) {
-		const hidden = testHiddenElement(win, element, ignoredTags, cacheElementsHidden);
+	function testHiddenElement(win, element) {
+		let hidden = element.hidden;
 		if (!hidden) {
-			let parentElement = element.parentElement;
-			if (parentElement) {
-				let parentElementHidden = testHiddenElement(win, parentElement, ignoredTags, cacheElementsHidden);
-				while (parentElement && !parentElementHidden) {
-					parentElement = parentElement.parentElement;
-					if (parentElement) {
-						parentElementHidden = testHiddenElement(win, parentElement, ignoredTags, cacheElementsHidden);
-					}
-				}
-				return parentElementHidden;
-			}
-		}
-		return hidden;
-	}
-
-	function testHiddenElement(win, element, ignoredTags, cacheElementsHidden) {
-		let hidden = cacheElementsHidden.get(element);
-		if (hidden === undefined) {
-			if (!ignoredTags.includes(element.tagName)) {
-				hidden = element.hidden;
-				if (!hidden) {
-					const style = win.getComputedStyle(element);
-					if (style) {
-						hidden = style.display == "none";
-						if (!hidden && (style.opacity == "0" || style.visibility == "hidden")) {
-							const boundingRect = element.getBoundingClientRect();
-							hidden = !boundingRect.width && !boundingRect.height;
-						}
-					}
+			const style = win.getComputedStyle(element);
+			if (style) {
+				hidden = style.display == "none";
+				if (!hidden && (style.opacity == "0" || style.visibility == "hidden")) {
+					const boundingRect = element.getBoundingClientRect();
+					hidden = !boundingRect.width && !boundingRect.height;
 				}
-				cacheElementsHidden.set(element, hidden);
 			}
-			hidden = Boolean(hidden);
 		}
+		hidden = Boolean(hidden);
 		return hidden;
 	}