diff --git a/NEWS b/NEWS
index 41584343fc3ea..d92b2cd993940 100644
--- a/NEWS
+++ b/NEWS
@@ -16,6 +16,7 @@ PHP                                                                        NEWS
 
 - DOM:
   . Added DOMNode::contains() and DOMNameSpaceNode::contains(). (nielsdos)
+  . Added DOMNOde::getRootNode(). (nielsdos)
 
 - Intl:
   . Fix memory leak in MessageFormatter::format() on failure. (Girgias)
diff --git a/UPGRADING b/UPGRADING
index 73c400e047f0d..66152dd2c8943 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -240,6 +240,7 @@ PHP 8.3 UPGRADE NOTES
 
 - DOM:
   . Added DOMNode::contains() and DOMNameSpaceNode::contains().
+  . Added DOMNOde::getRootNode().
 
 - JSON:
   . Added json_validate(), which returns whether the json is valid for
diff --git a/ext/dom/node.c b/ext/dom/node.c
index c5d81ea74ab3b..b9274841666ba 100644
--- a/ext/dom/node.c
+++ b/ext/dom/node.c
@@ -1818,4 +1818,30 @@ PHP_METHOD(DOMNode, contains)
 }
 /* }}} */
 
+/* {{{ URL: https://dom.spec.whatwg.org/#dom-node-getrootnode
+Since:
+*/
+PHP_METHOD(DOMNode, getRootNode)
+{
+	zval *id;
+	xmlNodePtr thisp;
+	dom_object *intern;
+	/* Unused now because we don't support the shadow DOM nodes. Options only influence shadow DOM nodes. */
+	zval *options = NULL;
+
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|a!", &options) == FAILURE) {
+		RETURN_THROWS();
+	}
+
+	DOM_GET_THIS_OBJ(thisp, id, xmlNodePtr, intern);
+
+	while (thisp->parent) {
+		thisp = thisp->parent;
+	}
+
+	int ret;
+	DOM_RET_OBJ(thisp, &ret, intern);
+}
+/* }}} */
+
 #endif
diff --git a/ext/dom/php_dom.stub.php b/ext/dom/php_dom.stub.php
index 3c3cf649293ee..23fea4ff85d56 100644
--- a/ext/dom/php_dom.stub.php
+++ b/ext/dom/php_dom.stub.php
@@ -391,6 +391,8 @@ public function removeChild(DOMNode $child) {}
     public function replaceChild(DOMNode $node, DOMNode $child) {}
 
     public function contains(DOMNode|DOMNameSpaceNode|null $other): bool {}
+
+    public function getRootNode(?array $options = null): DOMNode {}
 }
 
 /** @not-serializable */
diff --git a/ext/dom/php_dom_arginfo.h b/ext/dom/php_dom_arginfo.h
index cf47f1dae4fcc..576d8f5ed180e 100644
--- a/ext/dom/php_dom_arginfo.h
+++ b/ext/dom/php_dom_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: fd3acd731f178c2f1034b206b46d53c236823b9f */
+ * Stub hash: 82025bbc28e2da02f8ee32f0ec9648fd0d146c10 */
 
 ZEND_BEGIN_ARG_WITH_RETURN_OBJ_INFO_EX(arginfo_dom_import_simplexml, 0, 1, DOMElement, 0)
 	ZEND_ARG_TYPE_INFO(0, node, IS_OBJECT, 0)
@@ -104,6 +104,10 @@ ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_class_DOMNode_contains, 0, 1, _I
 	ZEND_ARG_OBJ_TYPE_MASK(0, other, DOMNode|DOMNameSpaceNode, MAY_BE_NULL, NULL)
 ZEND_END_ARG_INFO()
 
+ZEND_BEGIN_ARG_WITH_RETURN_OBJ_INFO_EX(arginfo_class_DOMNode_getRootNode, 0, 0, DOMNode, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, options, IS_ARRAY, 1, "null")
+ZEND_END_ARG_INFO()
+
 ZEND_BEGIN_ARG_WITH_TENTATIVE_RETURN_TYPE_INFO_EX(arginfo_class_DOMImplementation_getFeature, 0, 2, IS_NEVER, 0)
 	ZEND_ARG_TYPE_INFO(0, feature, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, version, IS_STRING, 0)
@@ -517,6 +521,7 @@ ZEND_METHOD(DOMNode, normalize);
 ZEND_METHOD(DOMNode, removeChild);
 ZEND_METHOD(DOMNode, replaceChild);
 ZEND_METHOD(DOMNode, contains);
+ZEND_METHOD(DOMNode, getRootNode);
 ZEND_METHOD(DOMImplementation, getFeature);
 ZEND_METHOD(DOMImplementation, hasFeature);
 ZEND_METHOD(DOMImplementation, createDocumentType);
@@ -699,6 +704,7 @@ static const zend_function_entry class_DOMNode_methods[] = {
 	ZEND_ME(DOMNode, removeChild, arginfo_class_DOMNode_removeChild, ZEND_ACC_PUBLIC)
 	ZEND_ME(DOMNode, replaceChild, arginfo_class_DOMNode_replaceChild, ZEND_ACC_PUBLIC)
 	ZEND_ME(DOMNode, contains, arginfo_class_DOMNode_contains, ZEND_ACC_PUBLIC)
+	ZEND_ME(DOMNode, getRootNode, arginfo_class_DOMNode_getRootNode, ZEND_ACC_PUBLIC)
 	ZEND_FE_END
 };
 
diff --git a/ext/dom/tests/DOMNode_getRootNode.phpt b/ext/dom/tests/DOMNode_getRootNode.phpt
new file mode 100644
index 0000000000000..b46acbe01d2d8
--- /dev/null
+++ b/ext/dom/tests/DOMNode_getRootNode.phpt
@@ -0,0 +1,32 @@
+--TEST--
+DOMNode::getRootNode()
+--EXTENSIONS--
+dom
+--FILE--
+<?php
+
+$dom = new DOMDocument();
+$dom->loadXML('<?xml version="1.0"?><html><body/></html>');
+
+var_dump($dom->documentElement->firstElementChild->getRootNode() === $dom);
+$p = $dom->createElement('p');
+var_dump($p->getRootNode() === $p);
+$dom->documentElement->appendChild($p);
+var_dump($p->getRootNode() === $dom);
+$dom->documentElement->remove();
+var_dump($p->getRootNode() === $p);
+
+$fragment = $dom->createDocumentFragment();
+var_dump($fragment->getRootNode() === $fragment);
+$div = $fragment->appendChild($dom->createElement('div'));
+$div->appendChild($p);
+var_dump($p->getRootNode() === $fragment);
+
+?>
+--EXPECT--
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)