dropdown nav bar code example

Example 1: dropdown navigation menu

<nav role="navigation">
  <ul>
    <li><a href="#">One</a></li>
    <li><a href="#">Two</a>
      <ul class="dropdown">
        <li><a href="#">Sub-1</a></li>
        <li><a href="#">Sub-2</a></li>
        <li><a href="#">Sub-3</a></li>
      </ul>
    </li>
    <li><a href="#">Three</a></li>
  </ul>
</nav>

Example 2: dropdown navigation menu

li {
 display: block;
 transition-duration: 0.5s;
}

li:hover {
  cursor: pointer;
}

ul li ul {
  visibility: hidden;
  opacity: 0;
  position: absolute;
  transition: all 0.5s ease;
  margin-top: 1rem;
  left: 0;
  display: none;
}

ul li:hover > ul,
ul li ul:hover {
  visibility: visible;
  opacity: 1;
  display: block;
}

ul li ul li {
  clear: both;
  width: 100%;
}

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