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<ul>
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</ul>
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<p><b>visible:hidden + opacity: 0</b></p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ducimus eum labore porro quae, recusandae sint. Ab
ipsa numquam optio ratione voluptate? Adipisci doloribus explicabo fuga fugit magnam minus nihil porro.</p>
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assumenda debitis ducimus harum incidunt libero molestiae mollitia reiciendis vel velit. Esse facere iste
laboriosam nobis ut!</p>
<p>Accusamus assumenda autem debitis deserunt, dolore ducimus ex harum incidunt ipsam ipsum iste iure nemo neque
nisi obcaecati officia pariatur possimus praesentium quidem recusandae sed sequi tempore ullam vel,
voluptas!</p>
<p>Ad dolore dolorem eligendi fuga incidunt, ipsa, iusto non nostrum numquam obcaecati odit, officiis quam quia
reiciendis totam vitae voluptatem. Corporis debitis eveniet explicabo ipsa magnam maiores maxime, modi
natus!</p>
<p>Ad asperiores culpa dolore ea esse impedit nostrum odio quasi, quidem, quis recusandae reiciendis repudiandae
vel! A ab mollitia natus quos voluptate! Ab debitis deserunt, ea eveniet repellat similique voluptas!</p>
<p>Ab aliquid animi debitis dolore esse explicabo fugit hic id, labore laborum magnam quae, repellendus rerum,
sit velit? Aspernatur assumenda dolor ea facilis, fugiat maiores natus quod sunt totam vitae.</p>
<p>Dolorum est, expedita facere illo illum libero neque, odio quia repellendus reprehenderit velit voluptate?
Animi autem, eveniet excepturi exercitationem impedit inventore itaque, molestiae neque perspiciatis
provident reiciendis reprehenderit repudiandae voluptatum.</p>
<p>Amet dolore est, eum expedita minima molestias nesciunt odio quidem recusandae, reiciendis tempora ut? Ad
asperiores delectus hic iste, minima nobis praesentium sunt tenetur? Doloribus est fuga incidunt modi
temporibus!</p>
<p>Ab accusantium animi consequatur, cupiditate dolorum ea ex explicabo facilis fugit laudantium libero officia
quidem quo rem veniam. Facilis fugit nobis sed! A asperiores fugiat illum. Dicta eveniet ex optio.</p>
<p>Alias delectus dignissimos doloremque eaque earum eligendi eos excepturi illo in ipsam labore laudantium
magnam, maiores molestiae molestias nam nisi numquam obcaecati praesentium quasi quidem quo repudiandae
sapiente similique soluta?</p>
<p>Accusantium aliquid, aperiam cumque dignissimos doloremque dolores ducimus eius eveniet expedita fuga
incidunt magni maiores molestiae nam natus nemo neque non quisquam quo saepe sapiente soluta vel veniam
veritatis voluptate.</p>
<p>Accusamus cum illo ipsum laboriosam pariatur quae similique ullam unde. A aliquid asperiores aspernatur
commodi culpa dolor, doloribus ea, earum exercitationem explicabo hic iure iusto maiores quas qui quis
voluptatibus?</p>
<p>Consectetur ea enim error facilis iure officia repudiandae sit! Ab asperiores aspernatur cupiditate deleniti
distinctio doloribus eaque eos, excepturi illum impedit nemo nesciunt quam quasi qui quis repellat
reprehenderit sequi.</p>
<p>Cum, expedita, quia. Consequatur facilis harum illo laboriosam maiores officiis placeat praesentium quae quas
vel! Accusantium aspernatur, aut enim expedita fuga incidunt quibusdam vero. Dicta facilis natus nobis quod
suscipit.</p>
<p>Eaque enim magni sapiente? A ab adipisci, aspernatur, assumenda commodi consectetur consequatur, dolorem
dolorum ea eius eos esse laborum nisi officiis praesentium quaerat quas qui recusandae tenetur vero voluptas
voluptates!</p>
<p>Accusantium atque blanditiis consectetur deserunt fuga fugiat harum id, in ipsum iste magni modi nemo
nesciunt nisi officiis possimus, quisquam reprehenderit, repudiandae sed similique tempora unde velit
voluptates? Mollitia, numquam?</p>
<p>Amet excepturi harum nemo sed. In, itaque, repudiandae. Quaerat, quod, temporibus! Adipisci dignissimos
doloremque eaque eum odit, officiis recusandae saepe sapiente unde velit. Ducimus eius error fugiat, maiores
quibusdam quis!</p>
<p>At ex labore laboriosam magni recusandae voluptas? Minima nesciunt sunt voluptatum? Ad aut commodi
consectetur consequuntur cumque doloremque ducimus, in iste laboriosam laudantium placeat, sed sint sit,
soluta voluptates voluptatibus.</p>
<p>Accusantium asperiores beatae cupiditate dicta doloremque eaque earum excepturi facere facilis hic labore,
laboriosam laborum magnam molestias mollitia natus necessitatibus nulla odit quam quibusdam quod ratione
reprehenderit sed veniam voluptas?</p>
<p>A dignissimos explicabo in numquam obcaecati optio reiciendis rem sapiente suscipit voluptate. Earum et fuga
iste itaque, maxime non placeat qui quibusdam quo vitae. Consequuntur deserunt necessitatibus nulla quos
voluptate!</p>
</div>
.wrapper {
margin: 0 auto;
width: 600px;
}
.menu_top ul {
padding: 0;
margin: 0;
list-style: none;
}
.menu_top > ul > li { /* 1-ый уровень */
float: left;
padding: 5px;
border: 1px black solid;
background: #fffa6e;
}
.menu_top > ul > li > ul { /* 2-ой уровень */
visibility: hidden; /* скрываем подменю */
opacity: 0; /* NEW */
position: absolute; /* Если не будет absolute, то все элементы будут строиться внутри существующего*/
background: #f2ffe8;
transition: opacity 1s ease-out; /* То, ради чего мы все это затеяли: CSS анимация */
}
.menu_top > ul > li:hover > ul {
visibility: visible; /* подменю появляется */
opacity: 1; /* NEW */
}
.clearfix:before,
.clearfix:after {
content: " ";
display: table;
}
.clearfix:after {
clear: both;
}
Also see: Tab Triggers