javascript - Set hover area to close subnav -

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how can set mouseout area of screen either between main (red) links @ top, or outside of subnav (green), when user moves mouse outside of main nav, subnav close?

document.addeventlistener('domcontentloaded', function(){  var d = document; var navsub = d.queryselector('.nav-sub'); var navheader = d.queryselector('.nav-header');  function toggledrawer(state){   navheader.dataset.drawerdisplay = state; }  //adding toggle state allows user close subnav clicking it, disables hover (now requires clicking) of main nav open subnav. messing mobile navigation. $(".nav-header").on('click',function(){       $(".nav-sub").slidetoggle("hide");     });  // header nav drawer function togglenav(){   var opener = d.queryselectorall('.opener');   [].foreach.call(opener, function(el, index) {       el.addeventlistener('mouseenter', function(){         toggledrawer('show');         navheader.dataset.drawernum = index;       });        el.addeventlistener('mouseout', function(){         navsub.addeventlistener('mouseenter', showdrawer('show'));         navsub.addeventlistener('mouseout', toggledrawer('hide'));         toggledrawer('hide');         navheader.dataset.drawernum = "";       });   }); } togglenav();

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