Remove tabpanel role when no tab items are rendered

Author: brijeshb42

packages-internal/core-docs/src/Demo/Demo.tsx

@@ -596,6 +596,7 @@ export function Demo(props: DemoProps) {
       console.error('Code content not copied', error);
     }
   };
+  const willRenderTabList = demoData.relativeModules && openDemoSource && !editorCode.isPreview;
 
   return (
     <Root>
@@ -667,7 +668,7 @@ export function Demo(props: DemoProps) {
             )}
           </DemoToolbarRoot>
           <Tabs.Root value={activeTab} onValueChange={handleTabChange}>
-            {demoData.relativeModules && openDemoSource && !editorCode.isPreview ? (
+            {willRenderTabList ? (
               <CodeTabList ownerState={ownerState}>
                 {tabs.map((tab, index) => (
                   <CodeTab
@@ -685,7 +686,12 @@ export function Demo(props: DemoProps) {
               {/* A limitation from https://github.com/nihgwu/react-runner,
                 we can't inject the `window` of the iframe so we need a disableLiveEdit option. */}
               {tabs.map((tab, index) => (
-                <Tabs.Panel value={index} key={index} tabIndex={-1}>
+                <Tabs.Panel
+                  role={willRenderTabList ? 'tabpanel' : undefined}
+                  value={index}
+                  key={index}
+                  tabIndex={-1}
+                >
                   {demoOptions.disableLiveEdit || index > 0 ? (
                     <DemoCodeViewer
                       key={index}

packages/mui-envinfo/README.md

@@ -9,33 +9,31 @@ Please use this package if you report [issues to MUI](https://github.com/mui/mat
 $ npx @mui/envinfo
 
   System:
-    OS: Linux 5.4 Ubuntu 20.04.1 LTS (Focal Fossa)
+    OS: macOS 26.4.1
   Binaries:
-    Node: 12.20.0 - ~/.nvm/versions/node/v12.20.0/bin/node
-    Yarn: 1.22.4 - /usr/bin/yarn
-    npm: 6.14.8 - ~/.nvm/versions/node/v12.20.0/bin/npm
+    Node: 24.14.0 - /Users/brijesh/.nvm/versions/node/v24.14.0/bin/node
+    npm: 11.9.0 - /Users/brijesh/.nvm/versions/node/v24.14.0/bin/npm
+    pnpm: 10.33.0 - /Users/brijesh/.nvm/versions/node/v24.14.0/bin/pnpm
   Browsers:
-    Chrome: 87.0.4280.66
-    Firefox: 83.0
+    Chrome: 147.0.7727.116
+    Firefox: 148.0.2
+    Safari: 26.4
   npmPackages:
-    @emotion/react: ^11.0.0 => 11.1.1
-    @emotion/styled: ^11.0.0 => 11.0.0
-    @mui/codemod:  5.0.0-alpha.17
-    @mui/material:  5.0.0-alpha.18
-    @mui/internal-core-docs:  5.0.0-alpha.1
+    @emotion/react: ^11.0.0 => 11.14.0
+    @emotion/styled: ^11.0.0 => 11.14.1
+    @mui/codemod:  9.0.0
+    @mui/material:  9.0.0
+    @mui/internal-core-docs:  9.0.1-canary.2
     @mui/envinfo:  2.0.0
-    @mui/icons-material:  5.0.0-alpha.15
-    @mui/lab:  5.0.0-alpha.18
-    @mui/styled-engine:  5.0.0-alpha.18
-    @mui/styled-engine-sc:  5.0.0-alpha.18
-    @mui/styles:  5.0.0-alpha.18
-    @mui/system:  5.0.0-alpha.18
-    @mui/types:  5.1.0
-    @mui/base:  5.0.0-alpha.18
-    @mui/utils:  5.0.0-alpha.18
-    @types/react: ^17.0.0 => 17.0.0
-    react: ^16.14.0 => 16.14.0
-    react-dom: ^16.14.0 => 16.14.0
-    styled-components:  5.2.1
-    typescript: ^4.0.2 => 4.0.5
+    @mui/icons-material:  9.0.0
+    @mui/styled-engine:  9.0.0
+    @mui/styled-engine-sc:  9.0.0
+    @mui/styles:  9.0.0
+    @mui/system:  9.0.0
+    @mui/types:  9.0.0
+    @mui/utils:  9.0.0
+    @types/react: ^19.0.0 => 19.2.14
+    react: ^19 => 19.2.5
+    react-dom: ^19 => 19.2.5
+    typescript: ^5 => 5.9.3
 ```