Tooltip
A tooltip shows a short hint when a reader hovers over a word, or reaches it with the keyboard.
Example
Every language gets its own SDK.
mdx
Every language gets its own <Tooltip tip="A generated client library">SDK</Tooltip>.Props
tipstringrequiredThe hint. Without it, nothing appears on hover.
childrentextrequiredThe word or phrase the hint is attached to, between the tags.
When to use one
Keep the hint to something a reader can do without. On a touch screen it only appears when they tap, and many readers never will. If they need the explanation to follow the page, write it in the sentence instead.