Minimum width

The minimum width for a combo box is combo-box-minimum-width-multiplier (2.5× the height of the field button for standard style). This minimum width guarantees that small combo boxes are readable and easy to target on touch devices.

Text overflow

When the field label and menu text are too long for the available horizontal space, they wrap to form another line. The field text itself truncates at the end, but the text can be shown in full in the menu.

Help text overflow

When the help text is too long for the available horizontal space, it wraps to form another line.

Menu height

The combo box menu can be as tall as necessary to show as many options as possible in the available space. There is no maximum height.