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>
    <alltransclusions gatcontinue="Scenario_Task|878" />
  </query-continue>
  <query>
    <pages>
      <page pageid="174" ns="10" title="Template:Font color" />
      <page pageid="249" ns="0" title="MpSEQ/protocol" />
      <page pageid="252" ns="0" title="Np1sec" />
      <page pageid="812" ns="0" title="To send an email that no one but me and the recipient can read" />
      <page pageid="854" ns="0" title="I want to investigate other options" />
      <page pageid="861" ns="0" title="I want to protect my Email" />
      <page pageid="863" ns="0" title="Only one of us knows how to use encryption" />
      <page pageid="864" ns="0" title="I want to learn about encrypting email" />
      <page pageid="865" ns="0" title="Email" />
      <page pageid="877" ns="0" title="Online Conversations" />
    </pages>
  </query>
</api>