Hover card

A preview card that appears on hover or focus.

In Dense data

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

In Dense data: A quick look at an asset or user on hover, also reachable on click. Never the only way to see 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

• Lead with the object, then the state: "Alert 2041 contained."
• Use numbers, not words for numbers.
• One verb per button. No "please", no exclamation marks.
• Use: Investigate, Filter, Assign, Escalated, Resolved. Avoid: Oops, Awesome, Please, Simply.

The labels components use, from the voice tokens:

• content.action.commit: Save
• content.action.cancel: Cancel
• content.action.destroy: Delete
• content.action.retry: Retry
• content.action.empty-action: Change filters

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

Dense data 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.fast:120ms
Content
Corner	component.hover-card.content.radiusradius.controlvar(--hover-card-content-radius)	radius.2:0.125rem
Fill Changes with theme	component.hover-card.content.backgroundcolor.surface.raisedvar(--hover-card-content-background)	Lightslate.light.0:#FFFFFFDarkslate.dark.100:#262D38
Padding	component.hover-card.content.paddingspace.inset.containervar(--hover-card-content-padding)	space.16:1rem
Text Changes with theme	component.hover-card.content.labelcolor.text.primaryvar(--hover-card-content-label)	Lightslate.light.900:#161B23Darkslate.dark.900:#F7F8FA
Shadow Changes with theme	component.hover-card.content.shadowelevation.overlayvar(--hover-card-content-shadow)	Lightshadow.overlayDarkshadow.overlay-dark
From the system
Edge Changes with theme	color.border.default straight from the system, through --border	Lightslate.light.200 · #DDE2EADarkslate.dark.100 · #262D38