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About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

     

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

     

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About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

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HTML

            
              <div class="wrapper">
        <div class="menu_top clearfix">
            <ul>
                <li><a href="">Category 01</a>
                    <ul>
                        <li><a href="">Product 01 - 1</a></li>
                        <li><a href="">Product 01 - 2</a></li>
                        <li><a href="">Product 01 - 3</a></li>
                    </ul>
                </li>
                <li><a href="">Category 02</a>
                    <ul>
                        <li><a href="">Product 02 - 1</a></li>
                        <li><a href="">Product 02 - 2</a></li>
                        <li><a href="">Product 02 - 3</a></li>
                        <li><a href="">Product 02 - 4</a></li>
                    </ul>
                </li>
                <li><a href="">Category 03</a>
                    <ul>
                        <li><a href="">Product 03 - 1</a></li>
                        <li><a href="">Product 03 - 2</a></li>
                    </ul>
                </li>
                <li><a href="">Category 04</a>
                    <ul>
                        <li><a href="">Product 04 - 1</a></li>
                        <li><a href="">Product 04 - 2</a></li>
                        <li><a href="">Product 04 - 3</a></li>
                        <li><a href="">Product 04 - 4</a></li>
                        <li><a href="">Product 04 - 5</a></li>
                    </ul>
                </li>
                <li><a href="">Category 05</a></li>
                <li><a href="">Category 06</a></li>
                <li><a href="">Category 07</a>
                    <ul>
                        <li><a href="">Product 07 - 1</a></li>
                        <li><a href="">Product 07 - 2</a></li>
                    </ul>
                </li>
                <li><a href="">Category 08</a></li>
                <li><a href="">Category 09</a></li>

            </ul>
        </div>
    </div>

    <div class="wrapper">
        <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>

        <p>Amet consequatur cum dolores est laboriosam mollitia non nostrum, ratione temporibus voluptas! Accusantium,
           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>
!

CSS

            
              .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;
}
!

JS
!
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