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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.
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<?xml version="1.0"?>
<api>
  <query-continue>
    <pageswithprop gpwpcontinue="20911" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page" contentmodel="wikitext" pagelanguage="en" touched="2018-02-23T17:42:51Z" lastrevid="364511" counter="26409" length="3315" />
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      <page pageid="3355" ns="10" title="Template:See also" contentmodel="wikitext" pagelanguage="en" touched="2017-03-26T21:01:55Z" lastrevid="364131" counter="0" length="134" />
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      <page pageid="3358" ns="10" title="Template:RCBox-blue mini" contentmodel="wikitext" pagelanguage="en" touched="2017-03-26T21:08:06Z" lastrevid="363984" counter="0" length="988" />
      <page pageid="20636" ns="0" title="Online GA 2015/SAPs/A Collaborative PPI (Complete Statute Overhaul)" contentmodel="wikitext" pagelanguage="en" touched="2017-03-26T21:08:06Z" lastrevid="362108" counter="0" length="153" />
      <page pageid="20644" ns="10" title="Template:RCBox-red" contentmodel="wikitext" pagelanguage="en" touched="2017-03-26T21:08:08Z" lastrevid="362102" counter="0" length="946" new="" />
      <page pageid="20908" ns="10" title="Template:RCBox-yellow" contentmodel="wikitext" pagelanguage="en" touched="2017-03-26T21:08:06Z" lastrevid="363556" counter="0" length="955" new="" />
      <page pageid="20909" ns="10" title="Template:RCBox-orange" contentmodel="wikitext" pagelanguage="en" touched="2017-03-26T21:08:06Z" lastrevid="363557" counter="0" length="955" new="" />
      <page pageid="20910" ns="10" title="Template:RCBox-pink" contentmodel="wikitext" pagelanguage="en" touched="2017-03-26T21:08:10Z" lastrevid="363558" counter="0" length="951" new="" />
    </pages>
  </query>
</api>