css - Create a CSS3 flip-down animation for menus -


i know there plenty of examples out there i'm having trouble making work specific html.

the html cannot changed, it's wordpress generated.

i have menu sub-menu containing 2 items.

i want create css3 animation flips down children items consecutively in example: http://cssdeck.com/labs/navigation-dropdown-with-flip-effect

i've been playing around code found in pen http://codepen.io/ganesh_r/pen/tmhsj not seeing similar attempting do.

my code pretty simple:

.sub-menu{-webkit-transform-style: preserve-3d;} .has-children:hover .sub-menu li{transition: 0.5s;transform-origin: 0px 0px;transform: rotatex(-90deg);}

i figured somewhere close after i'm seeing nothing. , i've hit bit of brick wall can't work out why i'm seeing nothing using code.

any ideas how can achieve consecutive drop down? html sample:

<li class="has-children main-link"><a>top level menu item</a>     <ul class="sub-menu">         <li><a>item one</a></li>         <li><a>item two</a></li>     </ul> </li>

and here js fiddle https://jsfiddle.net/656mxu6w/

see updated js fiddle: https://jsfiddle.net/j5su2upp/1/

in short need according sample provide hide drop down using transformations instead of display:none , re-transform show on hover using different transition delays different elements of menu in order "flip-down" effect. difference between code , sample being since don't have separate classes each individual li (and can't add them since can't update markup) need use nth-child selectors in css apply different styles different li elements.

the animation-specific styles therefore end this:

.sub-menu li {   -webkit-transform-origin: 50% 0%;   -o-transform-origin: 50% 0%;   transform-origin: 50% 0%;   -webkit-transform: perspective(350px) rotatex(-90deg);   -o-transform: perspective(350px) rotatex(-90deg);   transform: perspective(350px) rotatex(-90deg);   position: absolute;  }  .sub-menu li:nth-child(1) {    -webkit-transition:0.2s linear 0.2s;   -o-transition:0.2s linear 0.2s;   transition:0.2s linear 0.2s; } .sub-menu li:nth-child(2) {   -webkit-transition: 0.2s linear 0s;   -o-transition: 0.2s linear 0s;   transition: 0.2s linear 0s;   top: 94px; }  .has-children:hover .sub-menu li {   -webkit-transform: perspective(350px) rotatex(0deg);   -o-transform: perspective(350px) rotatex(0deg);   transform: perspective(350px) rotatex(0deg);   -webkit-transition:0.2s linear 0s;   -o-transition:0.2s linear 0s;   transition:0.2s linear 0s; }  .has-children:hover li:nth-child(2) {   -webkit-transition-delay: 0.2s;   -o-transition-delay: 0.2s;   transition-delay: 0.2s; }

edit: absolute positioning has been used overlap content following menu instead of pushing downwards. updated js fiddle https://jsfiddle.net/j5su2upp/2/


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