递归悬停导航 (仅 CSS)

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html

css

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html

css

html, body{
   padding:0px;
   margin:0px;
   background:#222;
   font-family: 'Karla', sans-serif;
   width:100vw;
}
body * {
   margin:0;
   padding:0;
}

/* HTML Nav Styles */
/* HTML Nav Styles */
/* HTML Nav Styles */
nav menuitem {
   position:relative;
   display:block;
   opacity:0;
   cursor:pointer;
}

nav menuitem > menu {
   position: absolute;
   pointer-events:none;
}
nav > menu { display:-webkit-box; display:-ms-flexbox; display:flex; }

nav > menu > menuitem { pointer-events: all; opacity:1; }
menu menuitem a { white-space:nowrap; display:block; }
   
menuitem:hover > menu {
   pointer-events:initial;
}
menuitem:hover > menu > menuitem,
menu:hover > menuitem{
   opacity:1;
}
nav > menu > menuitem menuitem menu {
   -webkit-transform:translateX(100%);
           transform:translateX(100%);
   top:0; right:0;
}
/* User Styles Below Not Required */
/* User Styles Below Not Required */
/* User Styles Below Not Required */

nav { 
   margin-top: 40px;
   margin-left: 40px;
}

nav a {
   background:#75F;
   color:#FFF;
   min-width:190px;
   -webkit-transition: background 0.5s, color 0.5s, -webkit-transform 0.5s;
   transition: background 0.5s, color 0.5s, -webkit-transform 0.5s;
   transition: background 0.5s, color 0.5s, transform 0.5s;
   transition: background 0.5s, color 0.5s, transform 0.5s, -webkit-transform 0.5s;
   margin:0px 6px 6px 0px;
   padding:20px 40px;
   -webkit-box-sizing:border-box;
           box-sizing:border-box;
   border-radius:3px;
   -webkit-box-shadow: 0px 2px 4px rgba(0, 0, 0, 0.5);
           box-shadow: 0px 2px 4px rgba(0, 0, 0, 0.5);
   position:relative;
}

nav a:hover:before {
   content: '';
   top:0;left:0;
   position:absolute;
   background:rgba(0, 0, 0, 0.2);
   width:100%;
   height:100%;
}

nav > menu > menuitem > a + menu:after{
   content: '';
   position:absolute;
   border:10px solid transparent;
   border-top: 10px solid white;
   left:12px;
   top: -40px;  
}
nav menuitem > menu > menuitem > a + menu:after{ 
   content: '';
   position:absolute;
   border:10px solid transparent;
   border-left: 10px solid white;
   top: 20px;
   left:-180px;
   -webkit-transition: opacity 0.6, -webkit-transform 0s;
   transition: opacity 0.6, -webkit-transform 0s;
   transition: opacity 0.6, transform 0s;
   transition: opacity 0.6, transform 0s, -webkit-transform 0s;
}

nav > menu > menuitem > menu > menuitem{
   -webkit-transition: opacity 0.6s, -webkit-transform 0.6s;
   transition: opacity 0.6s, -webkit-transform 0.6s;
   transition: transform 0.6s, opacity 0.6s;
   transition: transform 0.6s, opacity 0.6s, -webkit-transform 0.6s;
   -webkit-transform:translateY(150%);
           transform:translateY(150%);
   opacity:0;
}
nav > menu > menuitem:hover > menu > menuitem,
nav > menu > menuitem.hover > menu > menuitem{
   -webkit-transform:translateY(0%);
           transform:translateY(0%);
   opacity: 1;
}

menuitem > menu > menuitem > menu > menuitem{
   -webkit-transition: opacity 0.6s, -webkit-transform 0.6s;
   transition: opacity 0.6s, -webkit-transform 0.6s;
   transition: transform 0.6s, opacity 0.6s;
   transition: transform 0.6s, opacity 0.6s, -webkit-transform 0.6s;
   -webkit-transform:translateX(195px) translateY(0%);
           transform:translateX(195px) translateY(0%);
   opacity: 0;
} 
menuitem > menu > menuitem:hover > menu > menuitem,  
menuitem > menu > menuitem.hover > menu > menuitem{  
   -webkit-transform:translateX(0) translateY(0%);  
           transform:translateX(0) translateY(0%);
   opacity: 1;
}

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