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HTML
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>菜单 - 通过自定义属性调用的级联菜单</title>
  <link rel="stylesheet" href="https://cdn.w3cbus.com/library/mdui/1.0.2/css/mdui.min.css"/>
</head>
<body class="mdui-theme-primary-indigo mdui-theme-accent-pink">

  <div class="mdui-container mdui-p-t-5">
    <button class="mdui-btn mdui-color-theme-accent" mdui-menu="{target: '#demo-attr-cascade'}">cascade menu</button>

    <ul class="mdui-menu mdui-menu-cascade" id="demo-attr-cascade">
      <li class="mdui-menu-item">
        <a href="javascript:;" class="mdui-ripple">
          <i class="mdui-menu-item-icon mdui-icon material-icons">format_bold</i>
          Bold
          <span class="mdui-menu-item-helper">Ctrl+B</span>
        </a>
      </li>
      <li class="mdui-menu-item">
        <a href="javascript:;" class="mdui-ripple">
          <i class="mdui-menu-item-icon mdui-icon material-icons">format_italic</i>
          Italic
          <span class="mdui-menu-item-helper">Ctrl+I</span>
        </a>
      </li>
      <li class="mdui-menu-item">
        <a href="javascript:;" class="mdui-ripple">
          <i class="mdui-menu-item-icon"></i>
          Superscript
          <span class="mdui-menu-item-helper">Ctrl+.</span>
        </a>
      </li>
      <li class="mdui-divider"></li>
      <li class="mdui-menu-item">
        <a href="javascript:;" class="mdui-ripple">
          Paragraph style
          <span class="mdui-menu-item-more"></span>
        </a>
        <ul class="mdui-menu mdui-menu-cascade">
          <li class="mdui-menu-item">
            <a href="javascript:;" class="mdui-ripple">
              <i class="mdui-menu-item-icon"></i>Single
            </a>
          </li>
          <li class="mdui-menu-item">
            <a href="javascript:;" class="mdui-ripple">
              <i class="mdui-menu-item-icon"></i>1.15
            </a>
          </li>
          <li class="mdui-menu-item">
            <a href="javascript:;" class="mdui-ripple">
              <i class="mdui-menu-item-icon"></i>Double
            </a>
          </li>
          <li class="mdui-menu-item">
            <a href="javascript:;" class="mdui-ripple">
              <i class="mdui-menu-item-icon mdui-icon material-icons">check</i>Custom: 1.2
            </a>
          </li>
          <li class="mdui-divider"></li>
          <li class="mdui-menu-item">
            <a href="javascript:;" class="mdui-ripple">Add space before paragraph</a>
          </li>
          <li class="mdui-menu-item">
            <a href="javascript:;" class="mdui-ripple">Add space after paragraph</a>
          </li>
          <li class="mdui-divider"></li>
          <li class="mdui-menu-item">
            <a href="javascript:;" class="mdui-ripple">Custom spacing...</a>
          </li>
        </ul>
      </li>
      <li class="mdui-menu-item">
        <a href="javascript:;" class="mdui-ripple">
          Line spacing
          <span class="mdui-menu-item-more"></span>
        </a>
        <ul class="mdui-menu mdui-menu-cascade">
          <li class="mdui-menu-item">
            <a href="javascript:;" class="mdui-ripple">
              <i class="mdui-menu-item-icon"></i>
              Single
            </a>
          </li>
          <li class="mdui-menu-item">
            <a href="javascript:;" class="mdui-ripple">
              <i class="mdui-menu-item-icon"></i>
              1.15
            </a>
          </li>
          <li class="mdui-menu-item">
            <a href="javascript:;" class="mdui-ripple">
              <i class="mdui-menu-item-icon"></i>
              Double
            </a>
          </li>
          <li class="mdui-menu-item">
            <a href="javascript:;" class="mdui-ripple">
              <i class="mdui-menu-item-icon mdui-icon material-icons">check</i>
              Custom: 1.2
              <span class="mdui-menu-item-more"></span>
            </a>
            <ul class="mdui-menu mdui-menu-cascade">
              <li class="mdui-menu-item">
                <a href="javascript:;" class="mdui-ripple">
                  Line spacing
                  <span class="mdui-menu-item-helper">1.2</span>
                </a>
              </li>
              <li class="mdui-menu-item">
                <a href="javascript:;" class="mdui-ripple">
                  Paragraph spacing before
                  <span class="mdui-menu-item-helper">1.2</span>
                </a>
              </li>
              <li class="mdui-menu-item">
                <a href="javascript:;" class="mdui-ripple">
                  Paragraph spacing after
                  <span class="mdui-menu-item-helper">1.5</span>
                </a>
              </li>
            </ul>
          </li>
        </ul>
      </li>
    </ul>
  </div>

  <script src="https://cdn.w3cbus.com/library/mdui/1.0.2/js/mdui.min.js"></script>
</body>
</html>
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