<ch5-slider
id="demo"
step="20"
min="0"
max="200"
value="20"
valueHigh="80"
range="true">
</ch5-slider>
var elem = document.getElementById("demo");
elem.addEventListener('slider', function(e){
console.log('slider: ', e.detail);
});
elem.addEventListener('slidestart', function(e){
console.log('slidestart: ', e.detail);
});
elem.addEventListener('slideend', function(e){
console.log('slideend: ', e.detail);
});