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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>
    <allpages gapcontinue="Updating_the_kernel_on_the_GuruPlug" />
  </query-continue>
  <query>
    <pages>
      <page pageid="69" ns="0" title="TPLINK Archer T4U RTL8812au Linux Drivers" contentmodel="wikitext" pagelanguage="en" touched="2015-07-12T06:14:21Z" lastrevid="583" counter="81763" length="2492" />
      <page pageid="56" ns="0" title="Ubuntu14.04 Acer Aspire V5 571 Broadcom BCM43228 WiFi" contentmodel="wikitext" pagelanguage="en" touched="2014-04-27T03:28:20Z" lastrevid="392" counter="48702" length="568" />
      <page pageid="66" ns="0" title="Understanding RaspberryPi Boot Process" contentmodel="wikitext" pagelanguage="en" touched="2014-06-21T11:47:59Z" lastrevid="511" counter="126929" length="3116" />
      <page pageid="68" ns="0" title="Updating DTC" contentmodel="wikitext" pagelanguage="en" touched="2015-08-06T11:05:57Z" lastrevid="618" counter="19953" length="802" />
    </pages>
  </query>
</api>