diff --git a/packages/react-dom/src/__tests__/ReactRenderDocument-test.js b/packages/react-dom/src/__tests__/ReactRenderDocument-test.js
index c9b8cb89f3c..3dda50d3774 100644
--- a/packages/react-dom/src/__tests__/ReactRenderDocument-test.js
+++ b/packages/react-dom/src/__tests__/ReactRenderDocument-test.js
@@ -417,7 +417,9 @@ describe('rendering React components at document', () => {
// getTestDocument() has an extra that we didn't render.
expect(() =>
ReactDOM.hydrate(, testDocument),
- ).toWarnDev('Did not expect server HTML to contain a in .');
+ ).toWarnDev(
+ 'Did not expect server HTML to contain in .',
+ );
expect(testDocument.body.innerHTML).toBe('Hello world');
});
diff --git a/packages/react-dom/src/client/ReactDOMFiberComponent.js b/packages/react-dom/src/client/ReactDOMFiberComponent.js
index 4975e55f673..e65e410860b 100644
--- a/packages/react-dom/src/client/ReactDOMFiberComponent.js
+++ b/packages/react-dom/src/client/ReactDOMFiberComponent.js
@@ -62,6 +62,8 @@ const HTML = '__html';
const {html: HTML_NAMESPACE} = Namespaces;
+let getNodeSignature;
+
let getStack = () => '';
let warnedUnknownTags;
@@ -79,6 +81,17 @@ let normalizeHTML;
if (__DEV__) {
getStack = getCurrentFiberStackAddendum;
+ getNodeSignature = function(node: Element | Document) {
+ const attrs =
+ node instanceof Element
+ ? [].slice
+ .call(node.attributes)
+ .map(item => item.name + '="' + item.value + '"')
+ : [];
+ attrs.unshift(node.nodeName.toLowerCase());
+ return attrs.join(' ');
+ };
+
warnedUnknownTags = {
// Chrome is the only major browser not shipping