Get document from parentNode.ownerDocument

Co-authored-by: Hydrophobefireman <hi@hpfm.dev>

compat/src/portals.js

@@ -51,7 +51,8 @@ function Portal(props) {
 			removeChild(child) {
 				this.childNodes.splice(this.childNodes.indexOf(child) >>> 1, 1);
 				_this._container.removeChild(child);
-			}
+			},
+			ownerDocument: container.ownerDocument
 		};
 	}
 

src/component.js

@@ -141,7 +141,8 @@ function renderComponent(component) {
 			commitQueue,
 			oldDom == null ? getDomSibling(oldVNode) : oldDom,
 			!!(oldVNode._flags & MODE_HYDRATE),
-			refQueue
+			refQueue,
+			component._parentDom.ownerDocument
 		);
 
 		newVNode._original = oldVNode._original;

src/diff/children.js

@@ -25,6 +25,7 @@ import { getDomSibling } from '../component';
  * siblings. In most cases, it starts out as `oldChildren[0]._dom`.
  * @param {boolean} isHydrating Whether or not we are in hydration
  * @param {any[]} refQueue an array of elements needed to invoke refs
+ * @param {Document} doc The owner document of the parentNode
  */
 export function diffChildren(
 	parentDom,
@@ -37,7 +38,8 @@ export function diffChildren(
 	commitQueue,
 	oldDom,
 	isHydrating,
-	refQueue
+	refQueue,
+	doc
 ) {
 	let i,
 		/** @type {VNode} */
@@ -86,7 +88,8 @@ export function diffChildren(
 			commitQueue,
 			oldDom,
 			isHydrating,
-			refQueue
+			refQueue,
+			doc
 		);
 
 		// Adjust DOM nodes

src/diff/index.js

@@ -28,6 +28,7 @@ import options from '../options';
  * siblings. In most cases, it starts out as `oldChildren[0]._dom`.
  * @param {boolean} isHydrating Whether or not we are in hydration
  * @param {any[]} refQueue an array of elements needed to invoke refs
+ * @param {Document} doc The owner document of the parentNode
  */
 export function diff(
 	parentDom,
@@ -39,7 +40,8 @@ export function diff(
 	commitQueue,
 	oldDom,
 	isHydrating,
-	refQueue
+	refQueue,
+	doc
 ) {
 	/** @type {any} */
 	let tmp,
@@ -254,7 +256,8 @@ export function diff(
 				commitQueue,
 				oldDom,
 				isHydrating,
-				refQueue
+				refQueue,
+				doc
 			);
 
 			c.base = newVNode._dom;
@@ -304,7 +307,8 @@ export function diff(
 			excessDomChildren,
 			commitQueue,
 			isHydrating,
-			refQueue
+			refQueue,
+			doc
 		);
 	}
 
@@ -353,6 +357,7 @@ export function commitRoot(commitQueue, root, refQueue) {
  * to invoke in commitRoot
  * @param {boolean} isHydrating Whether or not we are in hydration
  * @param {any[]} refQueue an array of elements needed to invoke refs
+ * @param {Document} doc The owner document of the parentNode
  * @returns {PreactElement}
  */
 function diffElementNodes(
@@ -364,7 +369,8 @@ function diffElementNodes(
 	excessDomChildren,
 	commitQueue,
 	isHydrating,
-	refQueue
+	refQueue,
+	doc
 ) {
 	let oldProps = oldVNode.props;
 	let newProps = newVNode.props;
@@ -408,14 +414,10 @@ function diffElementNodes(
 
 	if (dom == null) {
 		if (nodeType === null) {
-			return document.createTextNode(newProps);
+			return doc.createTextNode(newProps);
 		}
 
-		dom = document.createElementNS(
-			namespace,
-			nodeType,
-			newProps.is && newProps
-		);
+		dom = doc.createElementNS(namespace, nodeType, newProps.is && newProps);
 
 		// we are creating a new node, so we can assume this is a new subtree (in
 		// case we are hydrating), this deopts the hydrate
@@ -517,7 +519,8 @@ function diffElementNodes(
 					? excessDomChildren[0]
 					: oldVNode._children && getDomSibling(oldVNode, 0),
 				isHydrating,
-				refQueue
+				refQueue,
+				doc
 			);
 
 			// Remove children that are not part of any vnode.

src/internal.d.ts

@@ -119,6 +119,7 @@ declare global {
 		_children?: VNode<any> | null;
 		/** Event listeners to support event delegation */
 		_listeners?: Record<string, (e: Event) => void>;
+		ownerDocument: Document;
 	}
 
 	export interface PreactEvent extends Event {

src/render.js

@@ -56,7 +56,8 @@ export function render(vnode, parentDom, replaceNode) {
 				? oldVNode._dom
 				: parentDom.firstChild,
 		isHydrating,
-		refQueue
+		refQueue,
+		parentDom.ownerDocument
 	);
 
 	// Flush all queued effects

test/browser/getOwnerDocument.test.js

@@ -0,0 +1,50 @@
+import { createElement, render } from 'preact';
+import { setupScratch, teardown } from '../_util/helpers';
+
+/** @jsx createElement */
+
+describe.only('parentDom.ownerDocument', () => {
+	/** @type {HTMLDivElement} */
+	let scratch;
+
+	before(() => {
+		scratch = setupScratch();
+	});
+
+	after(() => {
+		teardown(scratch);
+	});
+
+	it('should reference the correct document from the parent node', () => {
+		let iframe = document.createElement('iframe');
+
+		scratch.appendChild(iframe);
+
+		let iframeDoc = iframe.contentDocument;
+
+		iframeDoc.write(
+			'<!DOCTYPE html><html><head></head><body><div></div></body></html>'
+		);
+
+		iframeDoc.close();
+
+		let rootTextSpy = sinon.spy(document, 'createTextNode');
+		let rootElementSpy = sinon.spy(document, 'createElement');
+
+		let iframeTextSpy = sinon.spy(iframeDoc, 'createTextNode');
+		let iframeElementSpy = sinon.spy(iframeDoc, 'createElement');
+
+		let iframeRootNode = iframeDoc.querySelector('div');
+
+		render(<span>Hello</span>, iframeRootNode);
+
+		expect(rootTextSpy).not.to.be.called;
+		expect(rootElementSpy).not.to.be.called;
+		expect(iframeTextSpy).to.be.called;
+		expect(iframeElementSpy).to.be.called;
+
+		expect(iframeRootNode.textContent).to.be.equal('Hello');
+		expect(iframeRootNode.firstChild.ownerDocument).to.be.equal(iframeDoc);
+		expect(iframeRootNode.firstChild.ownerDocument).to.not.be.equal(document);
+	});
+});