Scroll Area

A native scroll container with custom scrollbars.

Vernacular architecture is building done outside any academic tradition, and without professional guidance. It is not a particular architectural movement or style, but rather a broad category, encompassing a wide range and variety of building types, with differing methods of construction, from around the world, both historical and extant and classical and modern. Vernacular architecture constitutes 95% of the world's built environment, as estimated in 1995 by Amos Rapoport, as measured against the small percentage of new buildings every year designed by architects and built by engineers.

This type of architecture usually serves immediate, local needs, is constrained by the materials available in its particular region and reflects local traditions and cultural practices. The study of vernacular architecture does not examine formally schooled architects, but instead that of the design skills and tradition of local builders, who were rarely given any attribution for the work. More recently, vernacular architecture has been examined by designers and the building industry in an effort to be more energy conscious with contemporary design and construction—part of a broader interest in sustainable design.

index.tsx index.module.css theme.css

import { ScrollArea } from '@base-ui/react/scroll-area';
import styles from './index.module.css';

export default function ExampleScrollArea() {
  return (
    <ScrollArea.Root className={styles.ScrollArea}>
      <ScrollArea.Viewport className={styles.Viewport}>
        <ScrollArea.Content className={styles.Content}>
          <p className={styles.Paragraph}>
            Vernacular architecture is building done outside any academic tradition, and without
            professional guidance. It is not a particular architectural movement or style, but
            rather a broad category, encompassing a wide range and variety of building types, with
            differing methods of construction, from around the world, both historical and extant and
            classical and modern. Vernacular architecture constitutes 95% of the world's built
            environment, as estimated in 1995 by Amos Rapoport, as measured against the small
            percentage of new buildings every year designed by architects and built by engineers.
          </p>
          <p className={styles.Paragraph}>
            This type of architecture usually serves immediate, local needs, is constrained by the
            materials available in its particular region and reflects local traditions and cultural
            practices. The study of vernacular architecture does not examine formally schooled
            architects, but instead that of the design skills and tradition of local builders, who
            were rarely given any attribution for the work. More recently, vernacular architecture
            has been examined by designers and the building industry in an effort to be more energy
            conscious with contemporary design and construction—part of a broader interest in
            sustainable design.
          </p>
        </ScrollArea.Content>
      </ScrollArea.Viewport>
      <ScrollArea.Scrollbar className={styles.Scrollbar}>
        <ScrollArea.Thumb className={styles.Thumb} />
      </ScrollArea.Scrollbar>
    </ScrollArea.Root>
  );
}

Anatomy

Import the component and assemble its parts:

Anatomy

import { ScrollArea } from '@base-ui/react/scroll-area';

<ScrollArea.Root>
  <ScrollArea.Viewport>
    <ScrollArea.Content />
  </ScrollArea.Viewport>
  <ScrollArea.Scrollbar>
    <ScrollArea.Thumb />
  </ScrollArea.Scrollbar>
  <ScrollArea.Corner />
</ScrollArea.Root>

Examples

Both scrollbars

Use <ScrollArea.Corner> to prevent the scrollbars from intersecting.

Gradient scroll fade

Use the viewport overflow CSS variables to drive a CSS mask, which gradually increases the fade as the user scrolls away from the edges.

scroll-area.module.css

.Viewport {
  mask-image: linear-gradient(
    to bottom,
    transparent 0,
    black min(40px, var(--scroll-area-overflow-y-start)),
    black calc(100% - min(40px, var(--scroll-area-overflow-y-end, 40px))),
    transparent 100%
  );
  mask-repeat: no-repeat;
}

For SSR, a fallback can be used as part of the end-side var() call so the mask is visible before the overflow CSS variables hydrate.

SSR fallback

var(--scroll-area-overflow-y-end, 40px);

When the fade is applied to <ScrollArea.Viewport> itself, the variables can be used directly. However, inheritance to children is disabled, so they must explicitly opt-in using the inherit keyword.

Child element opt-in

.Child {
  --scroll-area-overflow-y-start: inherit;
  --scroll-area-overflow-y-end: inherit;
}

Combining with Tabs

Use <Tabs.List>’s render prop to render <ScrollArea.Viewport> directly when the tab list itself needs the viewport overflow values for a mask fade. This keeps the mask logic on the same element that receives the scroll state.

Tabs with ScrollArea

<Tabs.Root defaultValue="overview">
  <ScrollArea.Root>
    <Tabs.List render={<ScrollArea.Viewport />}>
      <Tabs.Tab value="overview">Overview</Tabs.Tab>
      <Tabs.Indicator />
    </Tabs.List>
  </ScrollArea.Root>
  <Tabs.Panel value="overview">...</Tabs.Panel>
</Tabs.Root>

API reference

Root

Groups all parts of the scroll area. Renders a <div> element.

overflowEdgeThresholdUnion0

Name: overflowEdgeThreshold
Description: The threshold in pixels that must be passed before the overflow edge attributes are applied. Accepts a single number for all edges or an object to configure them individually.
Type: | number | Partial<{ xStart: number; xEnd: number; yStart: number; yEnd: number; }> | undefined
Default: 0

classNamestring | function—

Name: className
Description: CSS class applied to the element, or a function that returns a class based on the component’s state.
Type: | string | ((state: ScrollArea.Root.State) => string | undefined) | undefined

styleReact.CSSProperties | function—

Name: style
Description: Style applied to the element, or a function that returns a style object based on the component’s state.
Type: | React.CSSProperties | (( state: ScrollArea.Root.State, ) => React.CSSProperties | undefined) | undefined

renderReactElement | function—

Name: render
Description: Allows you to replace the component’s HTML element with a different tag, or compose it with another component.

Accepts a ReactElement or a function that returns the element to render.
Type: | ReactElement | (( props: HTMLProps, state: ScrollArea.Root.State, ) => ReactElement) | undefined

data-has-overflow-x

Present when the scroll area content is wider than the viewport.

data-has-overflow-y

Present when the scroll area content is taller than the viewport.

data-overflow-x-end

Present when there is overflow on the horizontal end side.

data-overflow-x-start

Present when there is overflow on the horizontal start side.

data-overflow-y-end

Present when there is overflow on the vertical end side.

data-overflow-y-start

Present when there is overflow on the vertical start side.

data-scrolling

Present when the user scrolls inside the scroll area.

Attribute	Description	-
`data-has-overflow-x`	Present when the scroll area content is wider than the viewport.
`data-has-overflow-y`	Present when the scroll area content is taller than the viewport.
`data-overflow-x-end`	Present when there is overflow on the horizontal end side.
`data-overflow-x-start`	Present when there is overflow on the horizontal start side.
`data-overflow-y-end`	Present when there is overflow on the vertical end side.
`data-overflow-y-start`	Present when there is overflow on the vertical start side.
`data-scrolling`	Present when the user scrolls inside the scroll area.

--scroll-area-corner-height

The scroll area’s corner height.

--scroll-area-corner-width

The scroll area’s corner width.

CSS Variable	Description	-
`--scroll-area-corner-height`	The scroll area’s corner height.
`--scroll-area-corner-width`	The scroll area’s corner width.

ScrollArea.Root.PropsHide

Re-Export of Root props as ScrollAreaRootProps

ScrollArea.Root.StateHide

type ScrollAreaRootState = {
  /** Whether the scroll area is being scrolled. */
  scrolling: boolean;
  /** Whether horizontal overflow is present. */
  hasOverflowX: boolean;
  /** Whether vertical overflow is present. */
  hasOverflowY: boolean;
  /** Whether there is overflow on the inline start side for the horizontal axis. */
  overflowXStart: boolean;
  /** Whether there is overflow on the inline end side for the horizontal axis. */
  overflowXEnd: boolean;
  /** Whether there is overflow on the block start side. */
  overflowYStart: boolean;
  /** Whether there is overflow on the block end side. */
  overflowYEnd: boolean;
  /** Whether the scrollbar corner is hidden. */
  cornerHidden: boolean;
}

Viewport

The actual scrollable container of the scroll area. Renders a <div> element.

classNamestring | function—

Name: className
Description: CSS class applied to the element, or a function that returns a class based on the component’s state.
Type: | string | (( state: ScrollArea.Viewport.State, ) => string | undefined) | undefined

styleReact.CSSProperties | function—

Name: style
Description: Style applied to the element, or a function that returns a style object based on the component’s state.
Type: | React.CSSProperties | (( state: ScrollArea.Viewport.State, ) => React.CSSProperties | undefined) | undefined

renderReactElement | function—

Name: render
Description: Allows you to replace the component’s HTML element with a different tag, or compose it with another component.

Accepts a ReactElement or a function that returns the element to render.
Type: | ReactElement | (( props: HTMLProps, state: ScrollArea.Viewport.State, ) => ReactElement) | undefined

data-has-overflow-x

Present when the scroll area content is wider than the viewport.

data-has-overflow-y

Present when the scroll area content is taller than the viewport.

data-overflow-x-end

Present when there is overflow on the horizontal end side.

data-overflow-x-start

Present when there is overflow on the horizontal start side.

data-overflow-y-end

Present when there is overflow on the vertical end side.

data-overflow-y-start

Present when there is overflow on the vertical start side.

data-scrolling

Present when the user scrolls inside the scroll area.

Attribute	Description	-
`data-has-overflow-x`	Present when the scroll area content is wider than the viewport.
`data-has-overflow-y`	Present when the scroll area content is taller than the viewport.
`data-overflow-x-end`	Present when there is overflow on the horizontal end side.
`data-overflow-x-start`	Present when there is overflow on the horizontal start side.
`data-overflow-y-end`	Present when there is overflow on the vertical end side.
`data-overflow-y-start`	Present when there is overflow on the vertical start side.
`data-scrolling`	Present when the user scrolls inside the scroll area.

--scroll-area-overflow-x-end

The distance from the horizontal end edge in pixels.

--scroll-area-overflow-x-start

The distance from the horizontal start edge in pixels.

--scroll-area-overflow-y-end

The distance from the vertical end edge in pixels.

--scroll-area-overflow-y-start

The distance from the vertical start edge in pixels.

CSS Variable	Description	-
`--scroll-area-overflow-x-end`	The distance from the horizontal end edge in pixels.
`--scroll-area-overflow-x-start`	The distance from the horizontal start edge in pixels.
`--scroll-area-overflow-y-end`	The distance from the vertical end edge in pixels.
`--scroll-area-overflow-y-start`	The distance from the vertical start edge in pixels.

ScrollArea.Viewport.PropsHide

Re-Export of Viewport props as ScrollAreaViewportProps

ScrollArea.Viewport.StateHide

type ScrollAreaViewportState = {
  /** Whether the scroll area is being scrolled. */
  scrolling: boolean;
  /** Whether horizontal overflow is present. */
  hasOverflowX: boolean;
  /** Whether vertical overflow is present. */
  hasOverflowY: boolean;
  /** Whether there is overflow on the inline start side for the horizontal axis. */
  overflowXStart: boolean;
  /** Whether there is overflow on the inline end side for the horizontal axis. */
  overflowXEnd: boolean;
  /** Whether there is overflow on the block start side. */
  overflowYStart: boolean;
  /** Whether there is overflow on the block end side. */
  overflowYEnd: boolean;
  /** Whether the scrollbar corner is hidden. */
  cornerHidden: boolean;
}

Content

A container for the content of the scroll area. Renders a <div> element.

classNamestring | function—

Name: className
Description: CSS class applied to the element, or a function that returns a class based on the component’s state.
Type: | string | (( state: ScrollArea.Content.State, ) => string | undefined) | undefined

styleReact.CSSProperties | function—

Name: style
Description: Style applied to the element, or a function that returns a style object based on the component’s state.
Type: | React.CSSProperties | (( state: ScrollArea.Content.State, ) => React.CSSProperties | undefined) | undefined

renderReactElement | function—

Name: render
Description: Allows you to replace the component’s HTML element with a different tag, or compose it with another component.

Accepts a ReactElement or a function that returns the element to render.
Type: | ReactElement | (( props: HTMLProps, state: ScrollArea.Content.State, ) => ReactElement) | undefined

ScrollArea.Content.PropsHide

Re-Export of Content props as ScrollAreaContentProps

ScrollArea.Content.StateHide

type ScrollAreaContentState = {
  /** Whether the scroll area is being scrolled. */
  scrolling: boolean;
  /** Whether horizontal overflow is present. */
  hasOverflowX: boolean;
  /** Whether vertical overflow is present. */
  hasOverflowY: boolean;
  /** Whether there is overflow on the inline start side for the horizontal axis. */
  overflowXStart: boolean;
  /** Whether there is overflow on the inline end side for the horizontal axis. */
  overflowXEnd: boolean;
  /** Whether there is overflow on the block start side. */
  overflowYStart: boolean;
  /** Whether there is overflow on the block end side. */
  overflowYEnd: boolean;
  /** Whether the scrollbar corner is hidden. */
  cornerHidden: boolean;
}

Scrollbar

A vertical or horizontal scrollbar for the scroll area. Renders a <div> element.

orientation'vertical' | 'horizontal''vertical'

Name: orientation
Description: Whether the scrollbar controls vertical or horizontal scroll.
Type: 'vertical' | 'horizontal' | undefined
Default: 'vertical'

classNamestring | function—

Name: className
Description: CSS class applied to the element, or a function that returns a class based on the component’s state.
Type: | string | (( state: ScrollArea.Scrollbar.State, ) => string | undefined) | undefined

styleReact.CSSProperties | function—

Name: style
Description: Style applied to the element, or a function that returns a style object based on the component’s state.
Type: | React.CSSProperties | (( state: ScrollArea.Scrollbar.State, ) => React.CSSProperties | undefined) | undefined

keepMountedbooleanfalse

Name: keepMounted
Description: Whether to keep the HTML element in the DOM when the viewport isn’t scrollable.
Type: boolean | undefined
Default: false

renderReactElement | function—

Name: render
Description: Allows you to replace the component’s HTML element with a different tag, or compose it with another component.

Accepts a ReactElement or a function that returns the element to render.
Type: | ReactElement | (( props: HTMLProps, state: ScrollArea.Scrollbar.State, ) => ReactElement) | undefined

data-orientation

Indicates the orientation of the scrollbar.

data-has-overflow-x

Present when the scroll area content is wider than the viewport.

data-has-overflow-y

Present when the scroll area content is taller than the viewport.

data-hovering

Present when the pointer is over the scroll area.

data-overflow-x-end

Present when there is overflow on the horizontal end side.

data-overflow-x-start

Present when there is overflow on the horizontal start side.

data-overflow-y-end

Present when there is overflow on the vertical end side.

data-overflow-y-start

Present when there is overflow on the vertical start side.

data-scrolling

Present when the user scrolls inside the scroll area.

Attribute	Description	-
`data-orientation`	Indicates the orientation of the scrollbar.
`data-has-overflow-x`	Present when the scroll area content is wider than the viewport.
`data-has-overflow-y`	Present when the scroll area content is taller than the viewport.
`data-hovering`	Present when the pointer is over the scroll area.
`data-overflow-x-end`	Present when there is overflow on the horizontal end side.
`data-overflow-x-start`	Present when there is overflow on the horizontal start side.
`data-overflow-y-end`	Present when there is overflow on the vertical end side.
`data-overflow-y-start`	Present when there is overflow on the vertical start side.
`data-scrolling`	Present when the user scrolls inside the scroll area.

--scroll-area-thumb-height

The scroll area thumb’s height.

--scroll-area-thumb-width

The scroll area thumb’s width.

CSS Variable	Description	-
`--scroll-area-thumb-height`	The scroll area thumb’s height.
`--scroll-area-thumb-width`	The scroll area thumb’s width.

ScrollArea.Scrollbar.PropsHide

Re-Export of Scrollbar props as ScrollAreaScrollbarProps

ScrollArea.Scrollbar.StateHide

type ScrollAreaScrollbarState = {
  /** Whether the scroll area is being hovered. */
  hovering: boolean;
  /** Whether the scroll area is being scrolled. */
  scrolling: boolean;
  /** The orientation of the scrollbar. */
  orientation: 'vertical' | 'horizontal';
  /** Whether horizontal overflow is present. */
  hasOverflowX: boolean;
  /** Whether vertical overflow is present. */
  hasOverflowY: boolean;
  /** Whether there is overflow on the inline start side for the horizontal axis. */
  overflowXStart: boolean;
  /** Whether there is overflow on the inline end side for the horizontal axis. */
  overflowXEnd: boolean;
  /** Whether there is overflow on the block start side. */
  overflowYStart: boolean;
  /** Whether there is overflow on the block end side. */
  overflowYEnd: boolean;
  /** Whether the scrollbar corner is hidden. */
  cornerHidden: boolean;
}

Thumb

The draggable part of the scrollbar that indicates the current scroll position. Renders a <div> element.

classNamestring | function—

Name: className
Description: CSS class applied to the element, or a function that returns a class based on the component’s state.
Type: | string | ((state: ScrollArea.Thumb.State) => string | undefined) | undefined

styleReact.CSSProperties | function—

Name: style
Description: Style applied to the element, or a function that returns a style object based on the component’s state.
Type: | React.CSSProperties | (( state: ScrollArea.Thumb.State, ) => React.CSSProperties | undefined) | undefined

renderReactElement | function—

Name: render
Description: Allows you to replace the component’s HTML element with a different tag, or compose it with another component.

Accepts a ReactElement or a function that returns the element to render.
Type: | ReactElement | (( props: HTMLProps, state: ScrollArea.Thumb.State, ) => ReactElement) | undefined

data-orientation

Indicates the orientation of the scrollbar.

Attribute	Description	-
`data-orientation`	Indicates the orientation of the scrollbar.

ScrollArea.Thumb.PropsHide

Re-Export of Thumb props as ScrollAreaThumbProps

ScrollArea.Thumb.StateHide

type ScrollAreaThumbState = {
  /** The component orientation. */
  orientation?: 'horizontal' | 'vertical';
}

Corner

A small rectangular area that appears at the intersection of horizontal and vertical scrollbars. Renders a <div> element.

classNamestring | function—

Name: className
Description: CSS class applied to the element, or a function that returns a class based on the component’s state.
Type: | string | ((state: ScrollArea.Corner.State) => string | undefined) | undefined

styleReact.CSSProperties | function—

Name: style
Description: Style applied to the element, or a function that returns a style object based on the component’s state.
Type: | React.CSSProperties | (( state: ScrollArea.Corner.State, ) => React.CSSProperties | undefined) | undefined

renderReactElement | function—

Name: render
Description: Allows you to replace the component’s HTML element with a different tag, or compose it with another component.

Accepts a ReactElement or a function that returns the element to render.
Type: | ReactElement | (( props: HTMLProps, state: ScrollArea.Corner.State, ) => ReactElement) | undefined

ScrollArea.Corner.PropsHide

Re-Export of Corner props as ScrollAreaCornerProps

ScrollArea.Corner.StateHide

type ScrollAreaCornerState = {}