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子ページがどんどん展開するナビゲーション

先ずはサンプル

個人的にはこの子ページ展開ってあまり好きでは無いのですが、割と需要があると思うのでご紹介致します。

CSS

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#navigation{
    height: 50px;
    background-color: #3F583B;
}
#navigation ul{
    background-color: #3F583B;
    margin: 0; padding: 0;
}
#navigation li{
    display: block;
    float: left;
    line-height: 50px;
    height: 50px;
    margin: 0;
    padding: 0;
    position: relative;
}
#navigation li a{
    display: block;
    height: 50px;
    line-height: 50px;
    padding: 0 15px;
    color: #FFFFFF;
    text-decoration: none;
}
#navigation a:hover {
    background: #54744F;
}
#navigation ul ul{
    display: none;
    position: absolute;
    top: 50px;
}
#navigation ul ul li{
    float: none;
    width: 150px;
    border-top: 1px solid #54744F;
    height: 35px;
    line-height: 35px;
}
#navigation ul ul li a {
    font-size:90%;
    height: 35px;
    line-height: 35px;
}
#navigation ul li:hover > ul{
    display: block;
}
#navigation ul ul li ul {
    left: 150px;
    top: 0;
}

HTML

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<!-- navigation -->
  <div id="navigation" class="hidden">
      <ul>
<!-- MENU 1 **************************************************** -->
        <li class="page_item"><a href="#">MENU-1</a>
          <ul>
            <li class="page_item"><a href="#">MENU1-1</a>
              <ul>
                <li class="page_item"><a href="#">MENU1-1-1</a>
                  <ul>
                    <li class="page_item"><a href="#">MENU1-1-1-1</a>
                      <ul>
                        <li class="page_item"><a href="#">MENU1-1-1-2-1</a></li>
                        <li class="page_item"><a href="#">MENU1-1-1-2-2</a></li>
                      </ul>
                    </li>
                    <li class="page_item"><a href="#">MENU1-1-1-2</a></li>
                  </ul>
                </li>
                <li class="page_item"><a href="#">MENU1-1-2</a></li>
                <li class="page_item"><a href="#">MENU1-1-4</a></li>
                <li class="page_item"><a href="#">MENU1-1-2</a></li>
              </ul>
            </li>
              <li class="page_item"><a href="#">MENU1-2</a>
              <ul>
                <li class="page_item"><a href="#">MENU1-2-1</a></li>
                <li class="page_item"><a href="#">MENU1-2-2</a></li>
              </ul>
              </li>
          </ul>
        </li>
<!-- MENU 2 **************************************************** -->
        <li class="page_item"><a href="#">MENU-2</a></li>
<!-- MENU 2 **************************************************** -->
        <li class="page_item"><a href="#">MENU-3</a>
            <ul>
              <li class="page_item"><a href="#">MENU3-1</a></li>
              <li class="page_item"><a href="#">MENU3-2</a></li>
            </ul>
        </li>
      </ul>
  </div>
<!-- #navigation -->