hideNumberSpinner( )

Hides the number spinner for a numeric text input.

The hideNumberSpinner() function returns a Promise when the number spinner for a numeric text input element is hidden. A numeric text input element is a text input that has the inputType property set to 'number'.
Calling hideNumberSpinner() sets the numberSpinnerHidden property to true.

The spinner allows site visitors to increment and decrement the numeric value of the text input.