I know that to set up an accordion type menu is like this:
<html>
<head>
<style>
.menu-sanfona li ul{
display:none;
}
.menu-sanfona li:focus ul{
display:block;
}
</style>
</head>
<body>
<ul class="menu-sanfona">
<li tabindex="0">Item 1
<ul>
<li>Item 1.1</li>
<li>Item 1.2</li>
</ul>
</li>
<li tabindex="1">Item 2
<ul>
<li>Item 2.1</li>
<li>Item 2.2</li>
</ul>
</li>
</ul>
</body>
</html>
What I would like to know is how to set up an accordion type of menu that opens more menus within the open menus eg
Let's say I clicked on "Item 1" and opened a submenu called "Item 1.1". Okay!
Then when I click on "Item 1.1" it shows another submenu with "Item 1.1.1", "Item 1.1.2", "Item 1.1.3" ... How would this code be using only HTML and CSS ??