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Tooltip can be described as a small label or text that appears next to a tool/control when the user pauses over it.
Some usability guidelines for tooltip
- The tooltip text should be kept small limiting to one or two words only.
- Should not use symbols and punctuation in the tooltip text.
- Tooltip should be visible for 3-5 secs when the user hovers over a button/tool and should be turned off after that.
- Should be really useful for novice users.