the top (vertical resizing) or left (horizontal resizing) absolute event position
var parentContainer = document.getElementById("resizeDiv");
webix.event(parentContainer,"mousedown",function(e){
var resizeStick = webix.ui.resizearea({
container:parentContainer,
dir:"y",
eventPos:webix.html.pos(e).y,
height: 5,
start:webix.html.pos(e).y-webix.html.offset(parentContainer).y,
width: parentContainer.offsetWidth,
});
})
Setting a pure number value doesn't make any sense.