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"?>
    <alllinks galcontinue="Chromebook_Data_and_Backup" />
      <page ns="0" title="Backup Windows laptop and desktop" missing="" />
      <page ns="0" title="Backup from Linux" missing="" />
      <page pageid="34" ns="0" title="Backup" />
      <page pageid="52" ns="0" title="Backup on Linux / OSX" />
      <page pageid="70" ns="0" title="Backup on Windows" />
      <page pageid="774" ns="0" title="Backup on Windows (background information)" />
      <page pageid="994" ns="0" title="Bitlocker" />
      <page pageid="174" ns="0" title="Borrow" />
      <page pageid="266" ns="0" title="Cached password in Windows non-domain PCs" />
      <page pageid="156" ns="0" title="Change Domain Password From MacOSX" />