Hover card

A preview card that appears on hover or focus.

Left out of Accessible first Touch screens have no hover, and public services are used on any device. A person with a tremor completes a form on a tablet. Use instead: Collapsible

See it live

Start Storybook to see it live: npm run storybook

Live from StorybookOpen Hover card in StorybookSee it in dark

When to use it

• Use it when: A quick look at a person or link for people with a mouse, with the same detail reachable on click.
• Not when: The only way to see the content: touch screens have no hover.

Instead:

• Popover: Opens on click, works on touch.
• Tooltip: A one-line hint.

Words

• Use common words. Explain any term you must use.
• One idea per sentence. Put the action first.
• Never blame the person.
• Use: Continue, Change, Start, You. Avoid: Invalid, Utilise, Submit, Error code.

The labels components use, from the voice tokens:

• content.action.commit: Continue
• content.action.cancel: Go back
• content.action.destroy: Delete
• content.action.retry: Try again
• content.action.empty-action: Start a new application

See Voice and tone for the whole voice.

Use it in code

npx open-ds add hover-card

The component reads only component keys and semantic tokens, so it follows the brand and mode on <html>.

Tokens it reads

Hover card reads 6 tokens of its own, each an alias of a semantic token. Each row is one part: its own token, the semantic it aliases, and the value it ends at. Change a semantic and every component that reads it follows; override one of Hover card's tokens to change Hover card alone.

Changes with theme

Accessible first decides what changes when you switch theme. Here a switch changes colors only, so the marked rows differ between light and dark; everything else holds steady.

Part	Its token and the semantic it aliases	Value
Shared
Transition panels duration	component.transition.panels-durationmotion.duration.panelsvar(--transition-panels-duration)	duration.moderate:200ms
Content
Corner	component.hover-card.content.radiusradius.controlvar(--hover-card-content-radius)	radius.6:0.375rem
Fill Changes with theme	component.hover-card.content.backgroundcolor.surface.raisedvar(--hover-card-content-background)	Lightgray.light.0:#FFFFFFDarkgray.dark.100:#222222
Padding	component.hover-card.content.paddingspace.inset.containervar(--hover-card-content-padding)	space.24:1.5rem
Text Changes with theme	component.hover-card.content.labelcolor.text.primaryvar(--hover-card-content-label)	Lightgray.light.900:#141414Darkgray.dark.900:#F7F7F7
Shadow	component.hover-card.content.shadowelevation.overlayvar(--hover-card-content-shadow)	shadow.none
From the system
Edge Changes with theme	color.border.default straight from the system, through --border	Lightgray.light.200 · #D6D6D6Darkgray.dark.100 · #222222