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I am writing ul inside ul to make a accordion type of menu. But when I check my code below in html validator it gives me these errors

Element ul not allowed as child of element ul in this context. (Suppressing further errors from this subtree.)

How can I write semantically correct html for ul in this case?

Here is my html

<nav class="row">
            <ul class="menu">
                <li>
                    <a href="">Uutiset</a>
                </li>
                <ul class="inside">
                    <li><a href="">Fringilla Condimentum</a></li>
                    <li><a href="">Lorem</a></li>
                    <li><a href="">Fringillau</a></li>
                    <li><a href="">Curabitur</a></li>
                    <li><a href="">Mollis</a></li>
                    <li><a href="">Ipsum</a></li>
                    <li><a href="">Lorem</a></li>
                    <li><a href="">Fringillau</a></li>
                    <li><a href="">Curabitur</a></li>
                    <li><a href="">Mollis</a></li>
                    <li><a href="">Ipsum</a></li>
                </ul>
                <li><a href="">Foorumi</a></li>
                <li><a href="">Kauppa</a></li>
                <li><a href="">Messut</a></li>
                <li>
                    <a href="">Asiakaspalvelu</a>
                </li>
                <ul class="inside">
                    <li><a href="">Tilaa lehti</a></li>
                    <li><a href="">Muutos tilaukseen</a></li>
                    <li><a href="">L?het? uutisvinkki</a></li>
                    <li><a href="">Anna palautetta</a></li>
                </ul>
                <li><a href="">Nakoislehti</a></li>
                <li><a href="">Nae meidat</a></li>
            </ul>
        </nav>
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1 Answer

You must wrap every inner ULs with an LI, i.e.

<ul class="menu">
    <li>
        <a href="">Uutiset</a>
    </li>
    <li> <----
        <ul class="inside">
            <li><a href="">Fringilla Condimentum</a></li>
            <li><a href="">Lorem</a></li>
        </ul>
    </li> <----
 </ul>      

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
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