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POProblme with HTML 5 validations
 

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    <p>I try to write HTML5 valid code for my webpage, but when I use the W3 Validator, I get an error message like this:</p> <p><code>Element ul not allowed as child of element ul in this context. (Suppressing further errors from this subtree.)</code></p> <p>What did I do wrong and how can I solve the problem? Here is my code: </p> <pre><code>&lt;ul class="ul_main"&gt; &lt;li&gt;INFORMÁCIÓK&lt;/li&gt; &lt;ul class="ul_sub"&gt; &lt;li&gt;&lt;img src="images/arrow.png" alt="" title=""&gt;ÚJ FEJLESZTŐ / KIADÓ&lt;/li&gt; &lt;li&gt;&lt;img src="images/arrow.png" alt="" title=""&gt;FEJLESZTŐK / KIADÓK&lt;/li&gt; &lt;/ul&gt; &lt;li&gt;KATEGÓRIÁK&lt;/li&gt; &lt;ul class="ul_sub"&gt; &lt;li&gt;&lt;img src="images/arrow.png" alt="" title=""&gt;ÚJ KATEGÓRIA&lt;/li&gt; &lt;li&gt;&lt;img src="images/arrow.png" alt="" title=""&gt;KATEGÓRIÁK&lt;/li&gt; &lt;/ul&gt; &lt;li&gt;PLATFORMOK&lt;/li&gt; &lt;ul class="ul_sub"&gt; &lt;li&gt;&lt;img src="images/arrow.png" alt="" title=""&gt;ÚJ PLATFORM&lt;/li&gt; &lt;li&gt;&lt;img src="images/arrow.png" alt="" title=""&gt;PLATFORMOK&lt;/li&gt; &lt;/ul&gt; &lt;li&gt;JÁTÉKOK&lt;/li&gt; &lt;ul class="ul_sub"&gt; &lt;li&gt;&lt;img src="images/arrow.png" alt="" title=""&gt;ÚJ ALAPINFORMÁCIÓ&lt;/li&gt; &lt;li&gt;&lt;img src="images/arrow.png" alt="" title=""&gt;ALAPINFORMÁCIÓK&lt;/li&gt; &lt;li&gt;&lt;img src="images/arrow.png" alt="" title=""&gt;ÚJ JÁTÉK&lt;/li&gt; &lt;li&gt;&lt;img src="images/arrow.png" alt="" title=""&gt;JÁTÉKOK&lt;/li&gt; &lt;li&gt;&lt;img src="images/arrow.png" alt="" title=""&gt;ÚJ GALÉRIA&lt;/li&gt; &lt;li&gt;&lt;img src="images/arrow.png" alt="" title=""&gt;GALÉRIÁK&lt;/li&gt; &lt;/ul&gt; &lt;li&gt;BLOGOK&lt;/li&gt; &lt;ul class="ul_sub"&gt; &lt;li&gt;&lt;img src="images/arrow.png" alt="" title=""&gt;ÚJ BLOG&lt;/li&gt; &lt;li&gt;&lt;img src="images/arrow.png" alt="" title=""&gt;BLOGOK&lt;/li&gt; &lt;/ul&gt; &lt;li&gt;BEÁLLÍTÁSOK&lt;/li&gt; &lt;ul class="ul_sub"&gt; &lt;li&gt;&lt;img src="images/arrow.png" alt="" title=""&gt;ÚJ SABLON&lt;/li&gt; &lt;li&gt;&lt;img src="images/arrow.png" alt="" title=""&gt;SABLONOK&lt;/li&gt; &lt;li&gt;&lt;img src="images/arrow.png" alt="" title=""&gt;RENDSZER&lt;/li&gt; &lt;/ul&gt; &lt;/ul&gt; </code></pre>
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