src/charts/stacked-area.js
function handleMouseOver(e, d) {
            overlay.style('display', 'block');
            verticalMarkerLine.classed('bc-is-active', true);

            dispatcher.call('customMouseOver', e, d, d3Selection.mouse(e));
        }
function handleMouseOver(e, d) {
            overlay.style('display', 'block');
            verticalMarkerLine.classed('bc-is-active', true);

            dispatcher.call('customMouseOver', e, d, d3Selection.mouse(e));
        }
function handleMouseOver ( e , d ) { overlay . style ( 'display' , 'block' ) ; verticalMarkerLine . classed ( 'bc-is-active' , true ) ; dispatcher . call ( 'customMouseOver' , e , d , d3Selection . mouse ( e ) ) ; }
Mouseover handler, shows overlay and adds active class to verticalMarkerLine
@private
Mouseover handler shows overlay and adds active class to verticalMarkerLine