diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 439d0045..00ef5d23 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,6 +5,9 @@ on: [push]
 jobs:
   composer:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php: [ 8.1, 8.2 ]
 
     steps:
       - uses: actions/checkout@v3
@@ -18,7 +21,7 @@ jobs:
       - name: Composer install
         uses: php-actions/composer@v6
         with:
-          php_version: 8.1
+          php_version: ${{ matrix.php }}
 
       - name: Archive build
         run: mkdir /tmp/github-actions/ && tar -cvf /tmp/github-actions/build.tar ./
@@ -32,6 +35,9 @@ jobs:
   phpunit:
     runs-on: ubuntu-latest
     needs: [ composer ]
+    strategy:
+      matrix:
+        php: [ 8.1, 8.2 ]
 
     outputs:
       coverage: ${{ steps.store-coverage.outputs.coverage_text }}
@@ -50,7 +56,7 @@ jobs:
         env:
           XDEBUG_MODE: cover
         with:
-          php_version: 8.1
+          php_version: ${{ matrix.php }}
           php_extensions: xdebug
           configuration: test/phpunit/phpunit.xml
           bootstrap: vendor/autoload.php
@@ -84,6 +90,9 @@ jobs:
   phpstan:
     runs-on: ubuntu-latest
     needs: [ composer ]
+    strategy:
+      matrix:
+        php: [ 8.1, 8.2 ]
 
     steps:
       - uses: actions/download-artifact@v3
@@ -97,9 +106,8 @@ jobs:
       - name: PHP Static Analysis
         uses: php-actions/phpstan@v3
         with:
-          php_version: 8.1
+          php_version: ${{ matrix.php }}
           path: src/
-          level: 4
 
   remove_old_artifacts:
     runs-on: ubuntu-latest
diff --git a/src/ChildNode.php b/src/ChildNode.php
index 52e8d6c6..abe296a9 100644
--- a/src/ChildNode.php
+++ b/src/ChildNode.php
@@ -44,7 +44,7 @@ public function remove():void {
 	 * @link https://developer.mozilla.org/en-US/docs/Web/API/ChildNode/before
 	 */
 	public function before(...$nodes):void {
-		$parent = $this->parentElement;
+		$parent = $this->parentNode;
 		if(!$parent) {
 			return;
 		}
@@ -67,7 +67,7 @@ public function before(...$nodes):void {
 	 * @link https://developer.mozilla.org/en-US/docs/Web/API/ChildNode/after
 	 */
 	public function after(...$nodes):void {
-		$parent = $this->parentElement;
+		$parent = $this->parentNode;
 		$nextSibling = $this->nextSibling;
 		if(!$parent) {
 			return;
@@ -90,7 +90,7 @@ public function after(...$nodes):void {
 	 * @link https://developer.mozilla.org/en-US/docs/Web/API/ChildNode/replaceWith
 	 */
 	public function replaceWith(...$nodes):void {
-		$parent = $this->parentElement;
+		$parent = $this->parentNode;
 		if(!$parent) {
 			return;
 		}
diff --git a/src/HTMLDocument.php b/src/HTMLDocument.php
index ffb0d2f6..f11049e1 100644
--- a/src/HTMLDocument.php
+++ b/src/HTMLDocument.php
@@ -61,7 +61,10 @@ public function __construct(
 		}
 
 		if($nonElementChildNodes) {
-			$this->documentElement->prepend(...$nonElementChildNodes);
+			call_user_func(
+				$this->documentElement->prepend(...),
+				...$nonElementChildNodes,
+			);
 		}
 	}
 
diff --git a/src/ParentNode.php b/src/ParentNode.php
index d3580e0d..70aa3e15 100644
--- a/src/ParentNode.php
+++ b/src/ParentNode.php
@@ -257,8 +257,6 @@ public function getElementsByTagName(string $qualifiedName):HTMLCollection {
 	/**
 	 * The removeChild() method of the Node interface removes a child node
 	 * from the DOM and returns the removed node.
-	 *
-	 * @param Node|Element|Text|Comment $child
 	 */
 	public function removeChild(Node|Element|Text|Comment|DOMNode|ProcessingInstruction $child):Node|Element|Text|Comment|CdataSection|ProcessingInstruction {
 		try {
diff --git a/src/RegisteredNodeClass.php b/src/RegisteredNodeClass.php
index b778ab37..8c5634f0 100644
--- a/src/RegisteredNodeClass.php
+++ b/src/RegisteredNodeClass.php
@@ -49,15 +49,15 @@ public function isEqualNode(Node|Element|Document|DocumentType|Attr|ProcessingIn
 		}
 
 		if($this instanceof Element
-			&& $otherNode instanceof Element) {
+		&& $otherNode instanceof Element) {
 			$similar = $this->namespaceURI === $otherNode->namespaceURI
 				&& $this->localName === $otherNode->localName
-				&& $this->attributes->length === $otherNode->attributes->length;
+				&& count($this->attributes) === count($otherNode->attributes);
 			if(!$similar) {
 				return false;
 			}
 
-			for($i = 0, $len = $this->attributes->length; $i < $len; $i++) {
+			for($i = 0, $len = count($this->attributes); $i < $len; $i++) {
 				$attr = $this->attributes->item($i);
 				$otherAttr = $otherNode->attributes->item($i);
 				if(!$attr->isEqualNode($otherAttr)) {
@@ -136,6 +136,7 @@ public function compareDocumentPosition(DOMNode|Node|Element $otherNode):int {
 		$unionPath = "$thisNodePath | $otherNodePath";
 		$xpathResult = $this->ownerDocument->evaluate($unionPath);
 
+		/** @var Node|Element|Document|DocumentType|Attr|ProcessingInstruction|DOMNode $node */
 		foreach($xpathResult as $node) {
 			if($node === $this) {
 				$bits |= Node::DOCUMENT_POSITION_FOLLOWING;
@@ -165,7 +166,7 @@ public function compareDocumentPosition(DOMNode|Node|Element $otherNode):int {
 	 * @return bool
 	 * @link https://developer.mozilla.org/en-US/docs/Web/API/Node/contains
 	 */
-	public function contains(Node|Element $otherNode):bool {
+	public function contains(Node|Element|Text|ProcessingInstruction|DocumentType|DocumentFragment|Document|Comment|CdataSection|Attr $otherNode):bool {
 		$context = $otherNode;
 
 		while($context = $context->parentNode) {
diff --git a/src/Traversal.php b/src/Traversal.php
index 8dcc1269..abbecf70 100644
--- a/src/Traversal.php
+++ b/src/Traversal.php
@@ -102,7 +102,9 @@ public function parentNode():null|Node|Element|Text|Attr|ProcessingInstruction|C
 			/** @var Element $node */
 			$node = $node->parentNode;
 
+			/** @phpstan-ignore-next-line */
 			if($node && $this->filter->acceptNode($node) === NodeFilter::FILTER_ACCEPT) {
+				/** @phpstan-ignore-next-line */
 				$this->pCurrentNode = $this->hintNullableNodeType($node);
 				return $this->pCurrentNode;
 			}
@@ -182,14 +184,17 @@ public function previousNode():null|Node|Element|Text|Attr|ProcessingInstruction
 			while(!is_null($sibling)) {
 				/** @var null|Node|Element|Text|Attr|ProcessingInstruction|Comment|Document|DocumentType|DocumentFragment $node */
 				$node = $sibling;
+				/** @phpstan-ignore-next-line */
 				$result = $this->filter->acceptNode($node);
 
 				while($result !== NodeFilter::FILTER_REJECT
-					&& !is_null($node->lastChild)) {
+				&& !is_null($node->lastChild)) {
 					$node = $node->lastChild;
+					/** @phpstan-ignore-next-line */
 					$result = $this->filter->acceptNode($node);
 				}
 				if($result === NodeFilter::FILTER_ACCEPT) {
+					/** @phpstan-ignore-next-line  */
 					$this->pCurrentNode = $this->hintNullableNodeType($node);
 					return $this->pCurrentNode;
 				}
@@ -203,7 +208,10 @@ public function previousNode():null|Node|Element|Text|Attr|ProcessingInstruction
 
 			/** @var null|Element|Node|Text $node */
 			$node = $node->parentNode;
+
+			/** @phpstan-ignore-next-line */
 			if($this->filter->acceptNode($node) === NodeFilter::FILTER_ACCEPT) {
+				/** @phpstan-ignore-next-line  */
 				$this->pCurrentNode = $this->hintNullableNodeType($node);
 				return $this->pCurrentNode;
 			}
@@ -388,6 +396,7 @@ private function nextSkippingChildren(
 				break;
 			}
 			if(!is_null($node->nextSibling)) {
+				/** @phpstan-ignore-next-line  */
 				return $this->hintNodeType($node->nextSibling);
 			}
 		}