title: PHP DOM html issue with a certain tag
body: <p>ppl. I ussualy find my answers looking the web and stackoverflow, but this time couldn't resolve my issue.
  I'm using php dom for parse a website and extract some data from it, but for some reason, all the ways i tryed keep returning me less items than the number on the page.</p>
  
  <p>Tryed with "simple php simple html dom", "php advanced html dom" and the native php dom... but still get, in this case, 14 article tags.</p>
  
  <p><a href="http://www.emol.com/movil/nacional/" rel="nofollow noreferrer">http://www.emol.com/movil/nacional/</a></p>
  
  <p>In this site there are 28 elements tagged "article", but i always get 14 (or less)</p>
  
  <p>Tryed using the classic find (from simple and advance), with all the combinations possible; and with the native one, query xpath and getelementsbytag.</p>
  
  <pre><code>$xpath-&gt;query('//article');
  $xpath-&gt;query('//*[@id="listNews"]/article[6]') //even this don't work
  $html-&gt;find('article:not(.sec_mas_vistas_emol), article'); //return 14
  </code></pre>
  
  <p>So my guess was the way i was loading the url... so i tryed the classic "file_get_html", curl, and some custom functions... and all them are the same.
  What is more extrange, is if i use a a online xpath tester, copy all the html and use the "query->('//article')... it find all.
  This are my two last tests:</p>
  
  <pre><code>//Way 1
  $html = file_get_html('http://www.emol.com/movil/nacional/');
  $lidata = $html-&gt;find('article');
  
  //Way 2
  $url = 'http://www.emol.com/movil/nacional';
  $ch = curl_init();
  $timeout = 5;
  curl_setopt($ch, CURLOPT_URL, $url);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
  $e = curl_exect($ch);
  $dom = new DOMDocument;
  @$dom-&gt;loadHTML($e); //tryed with loadHTMLFile too and the libxml_use_internal_erros
  $xpath = new DOMXPath($dom);
  $xpath-&gt;query('//article');
  </code></pre>
  
  <p>Any suggestion on what could be the issue and a way to fix it? Actually, is my first incursion with PHP dom, so possible there is something i'm missing.</p>