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@@ -0,0 +1,652 @@
+---
+title: React Suspense panel
+---
+
+
+
+The Suspense panel in React Developer Tools lets you inspect [``](/reference/react/Suspense) boundaries, find what caused them to suspend, and preview the order in which they reveal their content.
+
+
+
+
+
+The Suspense panel is currently available in the React Developer Tools extension for Chrome when it connects to a development build of React 19.3 Canary. It is not available for production builds. Other browser integrations may not include it yet.
+
+
+
+{/* TODO: Replace the screenshot placeholders before marking this PR ready. */}
+
+
+
+
+
The Beatles
+ Loading artist...}>
+
+ }>
+
+
+
+
+ );
+}
+
+function Biography() {
+ const biography = use(fetchData('/biography'));
+ return {biography}
;
+}
+
+function Albums() {
+ const albums = use(fetchData('/albums'));
+ return (
+
+ Albums
+
+ {albums.map(album => (
+ - {album.title}
+ ))}
+
+
+ );
+}
+
+function AlbumsGlimmer() {
+ return (
+
+ );
+}
+```
+
+```js src/data.js hidden
+const cache = new Map();
+
+export function fetchData(url) {
+ if (!cache.has(url)) {
+ cache.set(url, getData(url));
+ }
+ return cache.get(url);
+}
+
+async function getData(url) {
+ if (url === '/biography') {
+ await wait(800);
+ return 'The Beatles were an English rock band formed in Liverpool.';
+ }
+
+ if (url === '/albums') {
+ await wait(1800);
+ return [
+ { id: 1, title: 'Revolver' },
+ { id: 2, title: 'Abbey Road' },
+ { id: 3, title: 'Let It Be' },
+ ];
+ }
+
+ throw Error('Not implemented');
+}
+
+function wait(ms) {
+ return new Promise(resolve => {
+ setTimeout(resolve, ms);
+ });
+}
+```
+
+```css
+.bio {
+ font-style: italic;
+}
+
+.panel {
+ border: 1px solid #aaa;
+ border-radius: 6px;
+ margin-top: 20px;
+ padding: 10px;
+}
+
+.glimmer-panel {
+ background: linear-gradient(90deg, #ddd 0%, #fff 100%);
+ border: 1px dashed #aaa;
+ border-radius: 6px;
+ margin-top: 20px;
+ padding: 10px;
+}
+
+.glimmer-line {
+ background: #f0f0f0;
+ border-radius: 4px;
+ height: 20px;
+ margin: 10px;
+ width: 60%;
+}
+```
+
+```json package.json hidden
+{
+ "dependencies": {
+ "react": "19.3.0-canary-eb8feb71-20260814",
+ "react-dom": "19.3.0-canary-eb8feb71-20260814",
+ "react-scripts": "latest"
+ },
+ "scripts": {
+ "start": "react-scripts start"
+ }
+}
+```
+
+
+
+Hover over a region in the map to highlight its content on the page. Select a region to inspect that boundary. For nested boundaries, use the breadcrumbs above the map to move through their hierarchy.
+
+You can also select the inspect button in the panel, and then select content on the page.
+
+
+
+
+
The Beatles
+ Loading biography...}>
+
+
+ Loading albums...}>
+
+
+
+ );
+}
+
+function Biography() {
+ const biography = use(fetchBiography());
+ return {biography}
;
+}
+```
+
+```js src/Albums.js hidden
+export default function Albums() {
+ return (
+
+ Albums
+
+ - Revolver
+ - Abbey Road
+
+
+ );
+}
+```
+
+```js src/data.js hidden
+let biographyPromise;
+
+export function fetchBiography() {
+ if (!biographyPromise) {
+ biographyPromise = getBiography();
+ }
+ return biographyPromise;
+}
+
+async function getBiography() {
+ await new Promise(resolve => {
+ setTimeout(resolve, 900);
+ });
+ return 'The Beatles were an English rock band formed in Liverpool.';
+}
+```
+
+```json package.json hidden
+{
+ "dependencies": {
+ "react": "19.3.0-canary-eb8feb71-20260814",
+ "react-dom": "19.3.0-canary-eb8feb71-20260814",
+ "react-scripts": "latest"
+ },
+ "scripts": {
+ "start": "react-scripts start"
+ }
+}
+```
+
+
+
+Development builds can show causes such as `lazy`, Promises read with `use`, and resources including stylesheets, fonts, and images. Expand a cause to inspect the available details and timing.
+
+
+
+
+
+
+
{profile.name}
+
{profile.bio}
+
+
+
+
The Beatles
+ Loading biography...}>
+
+
+ }>
+
+
+ }>
+
+
+
+ );
+}
+
+function Biography() {
+ const biography = use(fetchData('/biography'));
+ return {biography}
;
+}
+
+function Albums() {
+ const albums = use(fetchData('/albums'));
+ return ;
+}
+
+function RelatedArtists() {
+ const artists = use(fetchData('/related-artists'));
+ return ;
+}
+
+function ItemList({ title, items }) {
+ return (
+
+ {title}
+
+ {items.map(item => - {item}
)}
+
+
+ );
+}
+
+function ListGlimmer() {
+ return (
+
+ );
+}
+```
+
+```js src/data.js hidden
+const cache = new Map();
+
+export function fetchData(url) {
+ if (!cache.has(url)) {
+ cache.set(url, getData(url));
+ }
+ return cache.get(url);
+}
+
+async function getData(url) {
+ const values = {
+ '/biography': {
+ delay: 700,
+ value: 'The Beatles were an English rock band formed in Liverpool.',
+ },
+ '/albums': {
+ delay: 1500,
+ value: ['Revolver', 'Abbey Road'],
+ },
+ '/related-artists': {
+ delay: 2300,
+ value: ['The Beach Boys', 'The Kinks'],
+ },
+ };
+ const result = values[url];
+ if (!result) {
+ throw Error('Not implemented');
+ }
+ await new Promise(resolve => {
+ setTimeout(resolve, result.delay);
+ });
+ return result.value;
+}
+```
+
+```css
+.bio {
+ font-style: italic;
+}
+
+.panel {
+ border: 1px solid #aaa;
+ border-radius: 6px;
+ margin-top: 20px;
+ padding: 10px;
+}
+
+.glimmer-panel {
+ background: linear-gradient(90deg, #ddd 0%, #fff 100%);
+ border: 1px dashed #aaa;
+ border-radius: 6px;
+ margin-top: 20px;
+ padding: 10px;
+}
+
+.glimmer-line {
+ background: #f0f0f0;
+ border-radius: 4px;
+ height: 20px;
+ margin: 10px;
+ width: 60%;
+}
+```
+
+```json package.json hidden
+{
+ "dependencies": {
+ "react": "19.3.0-canary-eb8feb71-20260814",
+ "react-dom": "19.3.0-canary-eb8feb71-20260814",
+ "react-scripts": "latest"
+ },
+ "scripts": {
+ "start": "react-scripts start"
+ }
+}
+```
+
+
+
+Use the previous and next buttons or drag the timeline to move between steps. Select play to advance through the steps automatically. The panel updates the inspected page to show the fallbacks and content that were visible at each step.
+
+The timeline previews the reveal sequence. It is not a performance recording and does not represent how long each boundary took to load.
+
+
+
+
+
The Beatles
+
+ Loading albums...}>
+
+
+
+ );
+}
+
+function Albums() {
+ const albums = use(getAlbums());
+ return (
+
+ {albums.map(album => - {album}
)}
+
+ );
+}
+```
+
+```js src/data.js hidden
+let albumsPromise;
+
+export function getAlbums() {
+ if (!albumsPromise) {
+ albumsPromise = loadAlbums();
+ }
+ return albumsPromise;
+}
+
+async function loadAlbums() {
+ await new Promise(resolve => {
+ setTimeout(resolve, 1200);
+ });
+ return ['Revolver', 'Abbey Road', 'Let It Be'];
+}
+```
+
+```json package.json hidden
+{
+ "dependencies": {
+ "react": "19.3.0-canary-eb8feb71-20260814",
+ "react-dom": "19.3.0-canary-eb8feb71-20260814",
+ "react-scripts": "latest"
+ },
+ "scripts": {
+ "start": "react-scripts start"
+ }
+}
+```
+
+
+
+
+
+
+