You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <allpages gapcontinue="Заглавная_страница/pl" />
  </query-continue>
  <query>
    <pages>
      <page pageid="46" ns="0" title="Активация противотуманных фар без специального оборудования" contentmodel="wikitext" pagelanguage="ru" touched="2013-11-22T15:41:42Z" lastrevid="340" counter="43528" length="1223" />
      <page pageid="51" ns="0" title="Главная страница" contentmodel="wikitext" pagelanguage="ru" touched="2016-10-18T19:42:40Z" lastrevid="437" counter="966768" length="1939" />
      <page pageid="1" ns="0" title="Заглавная страница" contentmodel="wikitext" pagelanguage="ru" touched="2016-10-18T19:42:40Z" lastrevid="375" counter="45311" length="45" redirect="" />
      <page pageid="56" ns="0" title="Заглавная страница/en" contentmodel="wikitext" pagelanguage="ru" touched="2012-10-05T14:09:20Z" lastrevid="188" counter="3191" length="1898" />
    </pages>
  </query>
</api>