Vertical secondary navigation implemented with css3

This article mainly introduces an example tutorial of vertical secondary navigation implemented in pure CSS3. The feature of this navigation menu is that it can have unlimited levels. There is code below, friends who don’t know how to do it can come and learn from it

I have shared a lot of navigation menus with you before. Today I bring you a vertical secondary navigation implemented purely in CSS3. This navigation menu can be infinite. Let’s take a look at the renderings:

Implemented code.

　html code:

<p style="width: 700px; margin: auto;">
        <p class="W1-h16">
            <ul>
                <li class="has-sub"><a href="#">Menu 1</a>
                    <ul>
                        <li class="has-sub"><a href="#">Submenu 1.1</a>
                            <ul>
                                <li><a href="#">Submenu 1.1.1</a></li>
                                <li class="has-sub"><a href="#">Submenu 1.1.2</a>
                                    <ul>
                                        <li><a href="#">Submenu 1.1.2.1</a></li>
                                        <li><a href="#">Submenu 1.1.2.2</a></li>
                                    </ul>
                                </li>
                            </ul>
                        </li>
                        <li><a href="#">Submenu 1.2</a></li>
                    </ul>
                </li>
                <li class="has-sub"><a href="#">Menu 2</a>
                    <ul>
                        <li><a href="#">Submenu 2.1</a></li>
                        <li><a href="#">Submenu 2.2</a></li>
                    </ul>
                </li>
                <li class="has-sub"><a href="#">Menu 3</a>
                    <ul>
                        <li><a href="#">Submenu 3.1</a></li>
                        <li><a href="#">Submenu 3.2</a></li>
                    </ul>
                </li>
            </ul>
        </p>
    </p>

　css3 code:

.W1-h16 {   
  padding: 0;   
  margin: 0;   
  border: 0;   
  line-height: 1;   
}   
.W1-h16 ul,   
.W1-h16 ul li,   
.W1-h16 ul ul {   
  list-style: none;   
  margin: 0;   
  padding: 0;   
}   
.W1-h16 ul {   
  position: relative;   
  z-index: 500;   
  float: left;   
}   
.W1-h16 ul li {   
  float: left;   
  min-height: 0.05em;   
  line-height: 1em;   
  vertical-align: middle;   
  position: relative;   
}   
.W1-h16 ul li.hover,   
.W1-h16 ul li:hover {   
  position: relative;   
  z-index: 510;   
  cursor: default;   
}   
.W1-h16 ul ul {   
  visibility: hidden;   
  position: absolute;   
  top: 100%;   
  left: 0px;   
  z-index: 520;   
  width: 100%;   
}   
.W1-h16 ul ul li {   
  float: none;   
}   
.W1-h16 ul ul ul {   
  top: 0;   
  rightright: 0;   
}   
.W1-h16 ul li:hover > ul {   
  visibility: visible;   
}   
.W1-h16 ul ul {   
  top: 0;   
  left: 99%;   
}   
.W1-h16 ul li {   
  float: none;   
}   
.W1-h16 ul ul {   
  margin-top: 0.05em;   
}   
.W1-h16 {   
  width: 13em;   
  background: #333333;   
  font-family: 'Oxygen Mono', Tahoma, Arial, sans-serif;   
  zoom: 1;   
}   
.W1-h16:before {   
  content: '';   
  display: block;   
}   
.W1-h16:after {   
  content: '';   
  display: table;   
  clear: both;   
}   
.W1-h16 a {   
  display: block;   
  padding: 1em 1.3em;   
  color: #ffffff;   
  text-decoration: none;   
  text-transform: uppercase;   
}   
.W1-h16 > ul {   
  width: 13em;   
}   
.W1-h16 ul ul {   
  width: 13em;   
}   
.W1-h16 > ul > li > a {   
  border-right: 0.3em solid #1b9bff;   
  color: #ffffff;   
}   
.W1-h16 > ul > li > a:hover {   
  color: #ffffff;   
}   
.W1-h16 > ul > li a:hover,   
.W1-h16 > ul > li:hover a {   
  background: #1b9bff;   
}   
.W1-h16 li {   
  position: relative;   
}   
.W1-h16 ul li.has-sub > a:after {   
  content: '»';   
  position: absolute;   
  rightright: 1em;   
}   
.W1-h16 ul ul li.first {   
  -webkit-border-radius: 0 3px 0 0;   
  -moz-border-radius: 0 3px 0 0;   
  border-radius: 0 3px 0 0;   
}   
.W1-h16 ul ul li.last {   
  -webkit-border-radius: 0 0 3px 0;   
  -moz-border-radius: 0 0 3px 0;   
  border-radius: 0 0 3px 0;   
  border-bottom: 0;   
}   
.W1-h16 ul ul {   
  -webkit-border-radius: 0 3px 3px 0;   
  -moz-border-radius: 0 3px 3px 0;   
  border-radius: 0 3px 3px 0;   
}   
.W1-h16 ul ul {   
  border: 1px solid #0082e7;   
}   
.W1-h16 ul ul a {   
  color: #ffffff;   
}   
.W1-h16 ul ul a:hover {   
  color: #ffffff;   
}   
.W1-h16 ul ul li {   
  border-bottom: 1px solid #0082e7;   
}   
.W1-h16 ul ul li:hover > a {   
  background: #4eb1ff;   
  color: #ffffff;   
}   
.W1-h16.align-rightright > ul > li > a {   
  border-left: 0.3em solid #1b9bff;   
  border-right: none;   
}   
.W1-h16.align-rightright {   
  float: rightright;   
}   
.W1-h16.align-rightright li {   
  text-align: rightright;   
}   
.W1-h16.align-rightright ul li.has-sub > a:before {   
  content: '+';   
  position: absolute;   
  top: 50%;   
  left: 15px;   
  margin-top: -6px;   
}   
.W1-h16.align-rightright ul li.has-sub > a:after {   
  content: none;   
}   
.W1-h16.align-rightright ul ul {   
  visibility: hidden;   
  position: absolute;   
  top: 0;   
  left: -100%;   
  z-index: 598;   
  width: 100%;   
}   
.W1-h16.align-rightright ul ul li.first {   
  -webkit-border-radius: 3px 0 0 0;   
  -moz-border-radius: 3px 0 0 0;   
  border-radius: 3px 0 0 0;   
}   
.W1-h16.align-rightright ul ul li.last {   
  -webkit-border-radius: 0 0 0 3px;   
  -moz-border-radius: 0 0 0 3px;   
  border-radius: 0 0 0 3px;   
}   
.W1-h16.align-rightright ul ul {   
  -webkit-border-radius: 3px 0 0 3px;   
  -moz-border-radius: 3px 0 0 3px;   
  border-radius: 3px 0 0 3px;   
}

The above is the entire content of this article. I hope it will be helpful to everyone's study. For more related content, please pay attention to the PHP Chinese website!

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