diff --git a/e2e/components/Axe.test.ts b/e2e/components/Axe.test.ts
new file mode 100644
index 00000000000..2432531f74e
--- /dev/null
+++ b/e2e/components/Axe.test.ts
@@ -0,0 +1,51 @@
+import {test, expect} from '@playwright/test'
+// @ts-ignore since this file is generated in the ci to generate this file run npx build storybook in packages/react
+import componentsConfig from '../../packages/react/storybook-static/index.json'
+import {visit} from '../test-helpers/storybook'
+import {themes} from '../test-helpers/themes'
+
+/**
+ * These stories should not be tested in the CI because they are stress-tests and
+ * perform slowly
+ */
+const SKIPPED_TESTS = [
+  'components-treeview-features--stress-test',
+  'components-treeview-features--contain-intrinsic-size',
+  'components-flash-features--with-icon-action-dismiss', // TODO: Remove once color-contrast issues have been resolved
+  'components-flash-features--with-icon-and-action', // TODO: Remove once color-contrast issues have been resolved
+]
+
+type Component = {
+  name: string
+}
+
+const {entries} = componentsConfig
+
+test.describe('@aat', () => {
+  for (const [id, entry] of Object.entries(entries as Record<string, Component>)) {
+    if (SKIPPED_TESTS.includes(id)) {
+      continue
+    }
+
+    const {name} = entry
+    // remove parentheses and slashes from the name to avoid playwright file issues
+    // eslint-disable-next-line no-useless-escape
+    const cleanedName = name.replaceAll(/[\(\)\/]/g, '')
+
+    test.describe(id, () => {
+      for (const theme of themes) {
+        test.describe(theme, () => {
+          test(`${cleanedName} @aat`, async ({page}) => {
+            await visit(page, {
+              id,
+              globals: {
+                colorScheme: theme,
+              },
+            })
+            await expect(page).toHaveNoViolations()
+          })
+        })
+      }
+    })
+  }
+})
diff --git a/packages/react/src/ActionMenu/ActionMenu.examples.stories.tsx b/packages/react/src/ActionMenu/ActionMenu.examples.stories.tsx
index ce1ca3662de..94986df4c28 100644
--- a/packages/react/src/ActionMenu/ActionMenu.examples.stories.tsx
+++ b/packages/react/src/ActionMenu/ActionMenu.examples.stories.tsx
@@ -410,15 +410,15 @@ export const MultipleSections = () => {
       </ActionMenu.Anchor>
       <ActionMenu.Overlay width="small">
         <ActionList>
-          <ActionList.Group selectionVariant="multiple">
+          <ActionList.Group>
             <ActionList.GroupHeading>Raw file content</ActionList.GroupHeading>
-            <ActionList.Item onSelect={() => alert('Workflows clicked')}>Download</ActionList.Item>
+            <ActionList.Item onClick={() => alert('Workflows clicked')}>Download</ActionList.Item>
             <ActionList.Divider />
-            <ActionList.Item onSelect={() => alert('Workflows clicked')}>Jump to line</ActionList.Item>
-            <ActionList.Item onSelect={() => alert('Workflows clicked')}>Find in file</ActionList.Item>
+            <ActionList.Item onClick={() => alert('Workflows clicked')}>Jump to line</ActionList.Item>
+            <ActionList.Item onClick={() => alert('Workflows clicked')}>Find in file</ActionList.Item>
             <ActionList.Divider />
-            <ActionList.Item onSelect={() => alert('Workflows clicked')}>Copy path</ActionList.Item>
-            <ActionList.Item onSelect={() => alert('Workflows clicked')}>Copy permalink</ActionList.Item>
+            <ActionList.Item onClick={() => alert('Workflows clicked')}>Copy path</ActionList.Item>
+            <ActionList.Item onClick={() => alert('Workflows clicked')}>Copy permalink</ActionList.Item>
           </ActionList.Group>
           <ActionList.Divider />
           <ActionList.Group selectionVariant="multiple">
@@ -434,9 +434,9 @@ export const MultipleSections = () => {
             ))}
           </ActionList.Group>
           <ActionList.Divider />
-          <ActionList.Group selectionVariant="multiple">
+          <ActionList.Group>
             <ActionList.GroupHeading>View options</ActionList.GroupHeading>
-            <ActionList.Item onSelect={() => alert('Delete file')} variant="danger">
+            <ActionList.Item onClick={() => alert('Delete file')} variant="danger">
               Delete file
             </ActionList.Item>
           </ActionList.Group>
diff --git a/packages/react/src/ActionMenu/ActionMenu.tsx b/packages/react/src/ActionMenu/ActionMenu.tsx
index b2dd4b81a9b..2e08c000876 100644
--- a/packages/react/src/ActionMenu/ActionMenu.tsx
+++ b/packages/react/src/ActionMenu/ActionMenu.tsx
@@ -217,9 +217,8 @@ const Anchor = React.forwardRef<HTMLElement, ActionMenuAnchorProps>(({children:
 })
 
 /** this component is syntactical sugar 🍭 */
-export type ActionMenuButtonProps = Omit<ButtonProps, 'children'> & {
-  children: React.ReactNode
-}
+export type ActionMenuButtonProps = ButtonProps
+
 const MenuButton = React.forwardRef(({...props}, anchorRef) => {
   return (
     <Anchor ref={anchorRef}>
diff --git a/packages/react/src/Banner/Banner.stories.tsx b/packages/react/src/Banner/Banner.stories.tsx
index 02d27d752d7..2dd11f58630 100644
--- a/packages/react/src/Banner/Banner.stories.tsx
+++ b/packages/react/src/Banner/Banner.stories.tsx
@@ -38,6 +38,7 @@ export const Playground: StoryObj<typeof Banner> = {
       <PageLayout>
         <PageLayout.Pane divider="line" position="start">
           <Banner
+            aria-label="Pane level banner"
             onDismiss={onDismiss ? action('onDismiss') : undefined}
             primaryAction={primaryAction ? <Banner.PrimaryAction>{primaryAction}</Banner.PrimaryAction> : null}
             secondaryAction={
@@ -49,6 +50,7 @@ export const Playground: StoryObj<typeof Banner> = {
 
         <PageLayout.Content>
           <Banner
+            aria-label="Content level banner"
             onDismiss={onDismiss ? action('onDismiss') : undefined}
             primaryAction={primaryAction ? <Banner.PrimaryAction>{primaryAction}</Banner.PrimaryAction> : null}
             secondaryAction={
diff --git a/packages/react/src/Button/ButtonBase.tsx b/packages/react/src/Button/ButtonBase.tsx
index 6303ffc5e5c..eb214607125 100644
--- a/packages/react/src/Button/ButtonBase.tsx
+++ b/packages/react/src/Button/ButtonBase.tsx
@@ -72,7 +72,8 @@ const ButtonBase = forwardRef(
         if (
           innerRef.current &&
           !(innerRef.current instanceof HTMLButtonElement) &&
-          !((innerRef.current as unknown) instanceof HTMLAnchorElement)
+          !((innerRef.current as unknown) instanceof HTMLAnchorElement) &&
+          !((innerRef.current as HTMLElement).tagName === 'SUMMARY')
         ) {
           // eslint-disable-next-line no-console
           console.warn('This component should be an instanceof a semantic button or anchor')
diff --git a/packages/react/src/ButtonGroup/ButtonGroup.features.stories.tsx b/packages/react/src/ButtonGroup/ButtonGroup.features.stories.tsx
index da2b99ff6e6..1325f09c8c2 100644
--- a/packages/react/src/ButtonGroup/ButtonGroup.features.stories.tsx
+++ b/packages/react/src/ButtonGroup/ButtonGroup.features.stories.tsx
@@ -73,7 +73,7 @@ export const InactiveButtonsGroup = () => {
   )
 
   const secondaryButton = (
-    <IconButton aria-label="Secondary Button Aria Label" aria-disabled={true} inactive={true} icon={DashIcon} />
+    <IconButton aria-label="Secondary Button" aria-disabled={true} inactive={true} icon={DashIcon} />
   )
 
   return (
@@ -84,7 +84,7 @@ export const InactiveButtonsGroup = () => {
 
       <ActionMenu open={false} onOpenChange={() => {}}>
         <ActionMenu.Anchor>
-          <Tooltip text="this button is inactive" direction="ne" type="label">
+          <Tooltip text="this button is inactive" direction="ne" type="description">
             {secondaryButton}
           </Tooltip>
         </ActionMenu.Anchor>
@@ -111,7 +111,7 @@ export const DropdownSplit = () => {
         {selectedAction}
       </Button>
       <ActionMenu>
-        <ActionMenu.Button icon={TriangleDownIcon}>More options</ActionMenu.Button>
+        <ActionMenu.Button aria-label="More options" icon={TriangleDownIcon} />
         <ActionMenu.Overlay>
           <ActionList>
             {actions.map((action, index) => {
diff --git a/packages/react/src/FilteredActionList/FilteredActionList.stories.tsx b/packages/react/src/FilteredActionList/FilteredActionList.stories.tsx
index 288044c974b..637a6a57455 100644
--- a/packages/react/src/FilteredActionList/FilteredActionList.stories.tsx
+++ b/packages/react/src/FilteredActionList/FilteredActionList.stories.tsx
@@ -4,6 +4,7 @@ import {ThemeProvider} from '..'
 import {FilteredActionList} from '../FilteredActionList'
 import BaseStyles from '../BaseStyles'
 import Box from '../Box'
+import {FeatureFlags} from '../FeatureFlags'
 
 const meta: Meta = {
   title: 'Components/FilteredActionList',
@@ -57,7 +58,7 @@ export function Default(): JSX.Element {
   const filteredItems = items.filter(item => item.text.toLowerCase().startsWith(filter.toLowerCase()))
 
   return (
-    <>
+    <FeatureFlags flags={{primer_react_select_panel_with_modern_action_list: true}}>
       <h1>Filtered Action List</h1>
       <div>Please select labels that describe your issue:</div>
       <FilteredActionList
@@ -66,6 +67,6 @@ export function Default(): JSX.Element {
         onFilterChange={setFilter}
         sx={{border: '1px solid', padding: '8px'}}
       />
-    </>
+    </FeatureFlags>
   )
 }
diff --git a/packages/react/src/Header/Header.dev.module.css b/packages/react/src/Header/Header.dev.module.css
index 8d90de7725a..4cc998f661c 100644
--- a/packages/react/src/Header/Header.dev.module.css
+++ b/packages/react/src/Header/Header.dev.module.css
@@ -1,5 +1,7 @@
 .HeaderDev {
-  background-color: var(--label-olive-bgColor-active);
+  color: var(--color-prettylights-syntax-carriage-return-text);
+  /* stylelint-disable-next-line primer/no-display-colors */
+  background-color: var(--display-pine-bgColor-emphasis);
 }
 
 .HeaderDevItem {
@@ -7,5 +9,5 @@
 }
 
 .HeaderDevLink {
-  color: var(--color-prettylights-syntax-markup-inserted-text);
+  color: var(--color-prettylights-syntax-carriage-return-text);
 }
diff --git a/packages/react/src/Header/Header.dev.stories.tsx b/packages/react/src/Header/Header.dev.stories.tsx
index 66756f36e93..a05c9898420 100644
--- a/packages/react/src/Header/Header.dev.stories.tsx
+++ b/packages/react/src/Header/Header.dev.stories.tsx
@@ -22,7 +22,7 @@ export const WithCss = () => (
       primer_react_css_modules_ga: true,
     }}
   >
-    <Header as="summary" className={classes.HeaderDev}>
+    <Header className={classes.HeaderDev}>
       <Header.Item id="github">
         <Header.Link href="#" className={classes.HeaderDevLink}>
           <Octicon icon={MarkGithubIcon} size={32} sx={{mr: 2}} />
@@ -38,7 +38,7 @@ export const WithCss = () => (
 )
 
 export const WithSx = () => (
-  <Header as="summary" sx={{backgroundColor: 'blue'}}>
+  <Header sx={{backgroundColor: 'blue', color: 'white'}}>
     <Header.Item id="github">
       <Header.Link href="#" sx={{fontSize: 3}}>
         <Octicon icon={MarkGithubIcon} size={32} sx={{mr: 2}} />
@@ -60,7 +60,7 @@ export const WithSxAndCSS = () => (
       primer_react_css_modules_ga: true,
     }}
   >
-    <Header as="summary" className={classes.HeaderDev} sx={{backgroundColor: 'orange'}}>
+    <Header className={classes.HeaderDev} sx={{backgroundColor: 'orange', color: 'black'}}>
       <Header.Item id="github">
         <Header.Link href="#" className={classes.HeaderDevLink} sx={{p: 0, color: 'black'}}>
           <Octicon icon={MarkGithubIcon} size={32} sx={{mr: 2}} />
diff --git a/packages/react/src/ProgressBar/ProgressBar.features.stories.tsx b/packages/react/src/ProgressBar/ProgressBar.features.stories.tsx
index 145dae260e7..0e79793d71a 100644
--- a/packages/react/src/ProgressBar/ProgressBar.features.stories.tsx
+++ b/packages/react/src/ProgressBar/ProgressBar.features.stories.tsx
@@ -19,10 +19,10 @@ export const Inline = () => <ProgressBar inline progress="66" sx={{width: '100px
 export const Color = () => <ProgressBar progress="66" bg="done.emphasis" aria-label="Upload test.png" />
 
 export const MultipleItems = () => (
-  <ProgressBar aria-valuenow={70} aria-label="Upload test.png">
-    <ProgressBar.Item progress={33} sx={{bg: 'accent.emphasis'}} />
-    <ProgressBar.Item progress={23} bg={'danger.emphasis'} />
-    <ProgressBar.Item progress={14} bg={'severe.emphasis'} />
+  <ProgressBar>
+    <ProgressBar.Item progress={33} aria-label="Photo Usage" sx={{bg: 'accent.emphasis'}} />
+    <ProgressBar.Item progress={23} aria-label="Application Usage" bg={'danger.emphasis'} />
+    <ProgressBar.Item progress={14} aria-label="Music Usage" bg={'severe.emphasis'} />
   </ProgressBar>
 )
 
diff --git a/packages/react/src/UnderlineNav/UnderlineNav.dev.stories.tsx b/packages/react/src/UnderlineNav/UnderlineNav.dev.stories.tsx
deleted file mode 100644
index f5003789d90..00000000000
--- a/packages/react/src/UnderlineNav/UnderlineNav.dev.stories.tsx
+++ /dev/null
@@ -1,17 +0,0 @@
-import React from 'react'
-import type {Meta} from '@storybook/react'
-import {UnderlineNav} from './index'
-
-export default {
-  title: 'Components/UnderlineNav/DevOnly',
-} as Meta
-
-export const IllegalState = () => {
-  return (
-    <UnderlineNav aria-label="Repository">
-      <UnderlineNav.Item aria-current="page">Code</UnderlineNav.Item>
-      <UnderlineNav.Item aria-current="page">Issues</UnderlineNav.Item>
-      <UnderlineNav.Item aria-current="page">Pull Requests</UnderlineNav.Item>
-    </UnderlineNav>
-  )
-}
diff --git a/packages/react/src/__tests__/ActionMenu.types.test.tsx b/packages/react/src/__tests__/ActionMenu.types.test.tsx
index 5e26f333e7f..753e7b24e20 100644
--- a/packages/react/src/__tests__/ActionMenu.types.test.tsx
+++ b/packages/react/src/__tests__/ActionMenu.types.test.tsx
@@ -2,7 +2,6 @@ import {ActionMenu} from '..'
 import React from 'react'
 
 export function actionButtonWithoutProps() {
-  // @ts-expect-error requires children
   return <ActionMenu.Button />
 }
 
diff --git a/packages/react/src/__tests__/storybook.test.tsx b/packages/react/src/__tests__/storybook.test.tsx
index d0bc7d1a7b7..67f985a3e34 100644
--- a/packages/react/src/__tests__/storybook.test.tsx
+++ b/packages/react/src/__tests__/storybook.test.tsx
@@ -4,6 +4,7 @@ import fs from 'node:fs'
 import path from 'node:path'
 
 const ROOT_DIRECTORY = path.resolve(__dirname, '..', '..')
+
 // Components opted into the new story format
 // TODO: Remove this allowlist when all components use the new story format
 const allowlist = [
@@ -56,6 +57,7 @@ const allowlist = [
   'Token',
   'UnderlineNav2',
 ]
+
 const stories = glob
   .sync('src/**/*.stories.tsx', {
     cwd: ROOT_DIRECTORY,
@@ -72,7 +74,12 @@ const stories = glob
     const type = path.basename(filepath, '.stories.tsx').endsWith('features') ? 'feature' : 'default'
     const name = type === 'feature' ? path.basename(file, '.features.stories.tsx') : path.basename(file, '.stories.tsx')
 
-    return {name, story: require(filepath), type, relativeFilepath: path.relative(ROOT_DIRECTORY, filepath)}
+    return {
+      name,
+      story: require(filepath),
+      type,
+      relativeFilepath: path.relative(ROOT_DIRECTORY, filepath),
+    }
   })
 
 const components = Object.entries(
diff --git a/packages/react/src/experimental/UnderlinePanels/UnderlinePanels.stories.tsx b/packages/react/src/experimental/UnderlinePanels/UnderlinePanels.stories.tsx
index bcbf370d80f..788a2fc12cb 100644
--- a/packages/react/src/experimental/UnderlinePanels/UnderlinePanels.stories.tsx
+++ b/packages/react/src/experimental/UnderlinePanels/UnderlinePanels.stories.tsx
@@ -16,11 +16,6 @@ const meta: Meta<typeof UnderlinePanels> = {
         name: 'string',
       },
     },
-    'aria-labelledby': {
-      type: {
-        name: 'string',
-      },
-    },
     id: {
       type: {
         name: 'string',
@@ -34,7 +29,6 @@ const meta: Meta<typeof UnderlinePanels> = {
   },
   args: {
     'aria-label': 'Select a tab',
-    'aria-labelledby': 'tab',
     id: 'test',
     loadingCounters: false,
   },
diff --git a/packages/react/src/stories/deprecated/ActionMenu.stories.tsx b/packages/react/src/stories/deprecated/ActionMenu.stories.tsx
index 89918a136eb..45355491f75 100644
--- a/packages/react/src/stories/deprecated/ActionMenu.stories.tsx
+++ b/packages/react/src/stories/deprecated/ActionMenu.stories.tsx
@@ -15,13 +15,11 @@ import type {Meta} from '@storybook/react'
 import React, {useCallback, useState, useRef} from 'react'
 import styled from 'styled-components'
 import {ThemeProvider} from '../..'
-import type {LinkProps} from '../../Link'
-import Link from '../../Link'
 import type {ActionMenuProps} from '../../deprecated'
 import {ActionMenu, ActionList} from '../../deprecated'
 import type {ItemProps} from '../../deprecated/ActionList'
 import BaseStyles from '../../BaseStyles'
-import {Button} from '../../Button'
+import {Button, type ButtonProps} from '../../Button'
 
 const meta: Meta = {
   title: 'Deprecated/Components/ActionMenu',
@@ -233,7 +231,7 @@ export function ComplexListStory(): JSX.Element {
 ComplexListStory.storyName = 'Complex List'
 
 export function CustomTrigger(): JSX.Element {
-  const customAnchor = (props: LinkProps) => <Link {...props} sx={{cursor: 'pointer'}} />
+  const customAnchor = (props: ButtonProps) => <Button {...props} sx={{cursor: 'pointer'}} />
   const [option, setOption] = useState('Select an option')
   const onAction = useCallback((itemProps: ItemProps) => {
     setOption(itemProps.text || '')