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>
    <alllinks galcontinue="CH391L/S14/Ancestral_sequence" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="BioBricks construction tutorial" missing="" />
      <page ns="0" title="CH391L/S12/iGEM Registry" missing="" />
      <page ns="0" title="CH391L/S13/DIY" missing="" />
      <page ns="0" title="CH391L/S13/Introduction" missing="" />
      <page pageid="27661" ns="0" title="BioBricks and Standardized Genetic Parts (Microbes as Machines)" />
      <page pageid="27693" ns="0" title="Biocontainment (Microbes as Machines)" />
      <page pageid="27237" ns="0" title="Biofuels (Biotechnology and Society)" />
      <page pageid="27723" ns="0" title="Biofuels versus Fossil Fuels (Biotechnology and Society 2016)" />
      <page pageid="20" ns="0" title="Bioterrorism and Dual-Use Research (Biotechnology and Society)" />
      <page pageid="27480" ns="0" title="CH391L/S14/Alex&#039;s First assignment" />
    </pages>
  </query>
</api>