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>
    <allimages gaicontinue="D4h-attendance.png" />
  </query-continue>
  <query>
    <pages>
      <page pageid="106" ns="6" title="Mynd:4G beinir í bækisstöð.JPG" />
      <page pageid="105" ns="6" title="Mynd:ADSL beinir í kompu.JPG" />
      <page pageid="87" ns="6" title="Mynd:Atc guide web.jpg" />
      <page pageid="56" ns="6" title="Mynd:Attavitinn.cropped.jpeg" />
      <page pageid="132" ns="6" title="Mynd:Bílaþrifbúnaður bílasápa.jpg" />
      <page pageid="135" ns="6" title="Mynd:Bílaþrifbúnaður háþrýstidæla.jpg" />
      <page pageid="133" ns="6" title="Mynd:Bílaþrifbúnaður inniþrif.jpg" />
      <page pageid="134" ns="6" title="Mynd:Bílaþrifbúnaður tjöruhreinsir.jpg" />
      <page pageid="131" ns="6" title="Mynd:Bílaþrifbúnaður í tækjasal.jpg" />
      <page pageid="111" ns="6" title="Mynd:D4h-add to-type.png" />
    </pages>
  </query>
</api>