Recommended

• As labels for elements that have no text, such as icons.
• If the information you're about to add is unnecessary as permanent text on the screen.

Not Recommended

• If the label of a user interface element describes the use sufficiently.
• If you want to abbreviate a text. It's better to write the full text of the label. Strive at using a solution that will be equally visible on all devices.
• If you want to provide a more detailed explanation. Use Web Assistant instead.

Recommended

• Use title case if the tooltip is like a label or title. Example: Current Start Date
• Use sentence style if the tooltip consists of a complete sentence (for example, an instruction) or is a longer verbal formulation.
• Use an ending period (.) for complete sentences. Example: Confirm the classification of the items.
• Use a verb in the imperative if the tooltip is an instruction or in the third person if the software determines the action.
• Keyboard shortcuts in parentheses ( ) are an accessibility requirement for buttons, GUI icons, and expandable elements such as trees or hierarchies. Example: Print (Ctrl + P).

Recommended

• Tooltip should be short: 5-10, up to 15 words. Long texts don't look attractive and can be hard to read.
• Align a set of tooltip formulations and examples that are suited to your product area or software type.

Not Recommended

• Don't copy the label of the user interface element as it is to the tooltip. This is redundant.