Fix clearing the stack of open elements for the "in table body" phase

HTMLKit/HTMLParser.m

@@ -1767,7 +1767,7 @@
 			[self emitParseError:@"Unexpected Tag Token (%@) for element in <tbody>", token.asTagToken.tagName];
 			return;
 		} else {
-			[_stackOfOpenElements clearBackToTableContext];
+			[_stackOfOpenElements clearBackToTableBodyContext];
 			[_stackOfOpenElements popCurrentNode];
 			[self switchInsertionMode:HTMLInsertionModeInTable];
 		}
@@ -1780,12 +1780,12 @@
 	switch (token.type) {
 		case HTMLTokenTypeStartTag:
 			if ([token.asTagToken.tagName isEqualToString:@"tr"]) {
-				[_stackOfOpenElements clearBackToTableContext];
+				[_stackOfOpenElements clearBackToTableBodyContext];
 				[self insertElementForToken:token.asTagToken];
 				[self switchInsertionMode:HTMLInsertionModeInRow];
 			} else if ([token.asTagToken.tagName isEqualToAny:@"th", @"td", nil]) {
 				[self emitParseError:@"Unexpected Start Tag Token (%@) in <tbody>", token.asTagToken.tagName];
-				[_stackOfOpenElements clearBackToTableContext];
+				[_stackOfOpenElements clearBackToTableBodyContext];
 				HTMLStartTagToken *trToken = [[HTMLStartTagToken alloc] initWithTagName:@"tr"];
 				[self insertElementForToken:trToken];
 				[self switchInsertionMode:HTMLInsertionModeInRow];

HTMLKit/HTMLStackOfOpenElements.h

@@ -31,9 +31,9 @@
 - (void)popElementsUntilAnElementPoppedWithAnyOfTagNames:(NSArray *)tagNames;
 - (void)popElementsUntilElementPopped:(HTMLElement *)element;
 - (void)clearBackToTableContext;
+- (void)clearBackToTableBodyContext;
 - (void)popAll;
 
-
 - (HTMLElement *)hasElementInScopeWithTagName:(NSString *)tagName;
 - (HTMLElement *)hasAnyElementInScopeWithAnyOfTagNames:(NSArray *)tagNames;
 - (HTMLElement *)hasElementInListItemScopeWithTagName:(NSString *)tagName;

HTMLKit/HTMLStackOfOpenElements.m

@@ -24,6 +24,7 @@
 {
 	self = [super init];
 	if (self) {
+		_stack = [NSMutableArray new];
 		_specificScopeElementTypes = @{
 									   @"applet": @(HTMLNamespaceHTML),
 									   @"caption": @(HTMLNamespaceHTML),
@@ -138,7 +139,12 @@
 
 - (void)clearBackToTableContext
 {
-	while (![self.currentNode.tagName isEqualToAny:@"table", @"template", @"html", nil]) {
+
+}
+
+- (void)clearBackToTableBodyContext
+{
+	while (![self.currentNode.tagName isEqualToAny:@"tbody", @"tfoot", @"thead", @"template", @"html", nil]) {
 		[_stack removeLastObject];
 	}
 }