#navigation {
position:relative;
width: 100%;
padding: 15px;
}
#navigation ul {
list-style-type: none;
}
#navigation ul > li {
position: relative;
float:left;
}
#navigation ul > li > * {
float: left;
}
#navigation ul.nav_sub_menu {
overflow:hidden;
}
#navigation ul.nav_sub_menu > li {
width: 100%;
}
#navigation div.nav_sub_menu_wrapper {
position: absolute;
overflow:hidden;
top: 42px;
max-height: 0;
}
#navigation a.nav_button:hover + div.nav_sub_menu_wrapper {
z-index: 99;
max-height: 500px;
}
#navigation a.nav_button:hover + div.nav_sub_menu_wrapper ul.nav_sub_menu {
/* iE doesn't play nice with shorthand play-state, but it's initially running so it's redundant */
-webkit-animation-play-state: running;
-moz-animation-play-state: running;
-o-animation-play-state: running;
animation-play-state: running;
-webkit-animation: slideDown 500ms linear 0ms 1 normal forwards; /* Chrome 4.3 | Edge | Safari 4.0 - 8.0 */
-moz-animation: slideDown 500ms linear 0ms 1 normal forwards; /* Firefox 5.0 | Gecko 16.0 */
-o-animation: slideDown 500ms linear 0ms 1 normal forwards; /* Opera 12 */
animation: slideDown 500ms linear 0s 1 normal forwards; /* Modern browsers */
}
@keyframes slideDown{
from {
max-height: 0;
}
to {
max-height: 500px;
}
}
#navigation a.nav_button {
/* Permalink - use to edit and share this gradient: http://colorzilla.com/gradient-editor/#b4ddb4+0,83c783+17,52b152+33,008a00+67,005700+83,002400+100;Green+3D+%231 */
background: #4E7C87; /* Old browsers */
background: -moz-linear-gradient(top, #4e7c87 0%, #4d5d87 17%, #2e4369 33%,
#253767 67%, #2d2f62 83%, #213059 100%); /* FF3.6-15 */
background: -webkit-linear-gradient(top, #4e7c87 0%, #4d5d87 17%, #2e4369 33%,
#253767 67%, #2d2f62 83%, #213059 100%); /* Chrome10-25,Safari5.1-6 */
background: linear-gradient(to bottom, #4e7c87 0%, #4d5d87 17%, #2e4369 33%,
#253767 67%, #2d2f62 83%, #213059 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#4e7c87', endColorstr='#304480',GradientType=0); /* IE6-9 */
color: white;
float: left;
padding: 10px 25px 10px 15px;
border: 1px solid black;
font-size:1.2em;
text-transform: uppercase;
text-decoration: none;
}
#navigation a.nav_button:hover {
background: #4E7C87; /* Old browsers */
background: -moz-linear-gradient(top, #4e7c87 0%, #4d5d87 17%, #2e4369 33%,
#3c3c8b 67%, #4d63aa 83%,#4d84e5 100%); /* FF3.6-15 */
background: -webkit-linear-gradient(top, #4e7c87 0%, #4d5d87 17%, #2e4369 33%,
#3c3c8b 67%, #4d63aa 83%,#4d84e5 100%); /* Chrome10-25,Safari5.1-6 */
background: linear-gradient(to bottom, #4e7c87 0%, #4d5d87 17%, #2e4369 33%,
#3c3c8b 67%, #4d63aa 83%,#4d84e5 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#4e7c87', endColorstr='#4473c8',GradientType=0); /* IE6-9 */
}
<section id="navigation">
\t \t <nav>
\t \t \t <ul>
\t \t \t \t <li>
\t \t \t \t \t <a href="javascript:void(0)" class="nav_button">Home</a>
\t \t \t \t </li>
\t \t \t \t <li>
\t \t \t \t \t <a href="javascript:void(0)" class="nav_button">Portfolio</a>
\t \t \t \t \t <div class="nav_sub_menu_wrapper">
\t \t \t \t \t \t <ul class="nav_sub_menu">
\t \t \t \t \t \t \t <li><a href="javascript:void(0)" class="nav_sub_button">About me</a></li>
\t \t \t \t \t \t \t <li><a href="javascript:void(0)" class="nav_sub_button">Goals</a></li>
\t \t \t \t \t \t \t <li><a href="javascript:void(0)" class="nav_sub_button">Realizations</a></li>
\t \t \t \t \t \t \t <li><a href="javascript:void(0)" class="nav_sub_button">Future plans</a></li>
\t \t \t \t \t \t </ul>
\t \t \t \t \t </div>
\t \t \t \t </li>
\t \t \t \t <li>
\t \t \t \t \t <a href="javascript:void(0)" class="nav_button">About</a>
\t \t \t \t </li>
\t \t \t \t <li>
\t \t \t \t \t <a href="javascript:void(0)" class="nav_button">Contact</a>
\t \t \t \t </li>
\t \t \t </ul>
\t \t </nav>
\t </section>
あなたは 'あなたのフィドルの@ keyframes'が含まれていませんか? – Akshay
@Akshayのようなキーフレームを含めるとうまく動作するようです。https://jsfiddle.net/ugue8hma/4/ –
@Akshay Whoops my bad。ちょうどそれをフィドルに加えました。私はバージョン2で働いていました – DerpyNerd