# Slider

A slider widget is a sunken rectangle on which a button moves in one dimension, either vertically or horizontally. A slider appears as a linear scale with optional numerical labes and an optional short label. Sliders are typically used to edit a numerical value. The user adjust the value by clicking mouse button 1 in the slider or by dragging the slide button with mouse button 1. If a slider has callbacks, they are invoked whenever its numeric value changes