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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>
    <alllinks galcontinue="Backing_Up_and_Restoring_OnePager_Files_for_Version_6.1" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1923" ns="0" title="Background Images for OnePager Live (Portal)" />
      <page pageid="3642" ns="0" title="Background Images for OnePager Live Beta 2 (Portal)" />
      <page pageid="1641" ns="0" title="Background Images for Version 5.3 (Portal)" />
      <page pageid="3186" ns="0" title="Background Images for Version 6.0 (Portal)" />
      <page pageid="3875" ns="0" title="Background Images for Version 6.1 (Portal)" />
      <page pageid="5707" ns="0" title="Background Images for Version 7.0 (Portal)" />
      <page pageid="9799" ns="0" title="Background Images for Version 7.1 (Portal)" />
      <page pageid="11739" ns="0" title="Background Images for Version 7.2 (Portal)" />
      <page pageid="1001" ns="0" title="Backing Up and Restoring OnePager Files" />
      <page pageid="2039" ns="0" title="Backing Up and Restoring OnePager Files for OnePager Live" />
    </pages>
  </query>
</api>