line 35 ----------------------------------------------------------------------
unhover.raw = function unhoverRaw(gd, evt) {
var fullLayout = gd._fullLayout;
var oldhoverdata = gd._hoverdata;
if(!evt) evt = {};
if(evt.target &&
Events.triggerHandler(gd, 'plotly_beforehover', evt) === false) {
return;
}
.....
Why is it a ‘plotly_beforehover’ event?