In this JSFiddle, hold down the mouse key and drag outside of the JSFiddle result iframe.
Then release the button. Move the mouse over the slider. Then, the slider value will be changed, without holding down the button.
How to prevent this behavior?
The code is pretty simple:
var $range = $(".js-range-slider");
$range.ionRangeSlider({
type: "double",
min: 100,
max: 1000,
from: 300,
to: 800
});