Sitete W3C Hatası hakkında

<ul><li <?php if(is_home()) { ?> class="secili"<?php } ?>> 
  <a data-test="test" rel="nofollow" style="word-wrap: break-word; text-decoration: underline;" target="_blank" onclick="return dhExternalLinkRedirect(this)" href="/ExternalLinkRedirect?module=pgdcode&messageId=52609879&url=<?php bloginfo('home'); ?>" title="<?php echo get_option('anahtar_kelime2'); ?>" data-href="<?php bloginfo('home'); ?>" title="<?php echo get_option('anahtar_kelime2'); ?>">Anasayfa</a></li> 
  <?php wp_list_pages('number=5&sort_column=menu_order&depth=1&title_li='); ?> 
  </ul> 
  <div id="arama"><form action="<?php bloginfo('home'); ?>" method="get"><input onfocus="if (this.value == this.defaultValue) {this.value = '';this.style.color='#333';}" onblur="if (this.value == this.defaultValue || this.value == '') {this.value = this.defaultValue;this.style.color='#d9d9d9';}" type="text" name="s" value="<?php echo wp_specialchars($s, 1); ?>" /><button type="submit">Ara</button></form></div></div> 
  <div id="kategorilerorta"><div id="kategoriler"><ul><li class="frst"></li><?php wp_list_categories('number=8&title_li='); ?><li class="lst"></li></ul> 
  </div></div><div class="temizlikci"></div><div id="ust_oval"></div><div id="tum">