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>
    <embeddedin geicontinue="10|Stub|1991" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1631" ns="0" title="Super Mario 64" contentmodel="wikitext" pagelanguage="en" touched="2013-11-05T15:45:13Z" lastrevid="36108" counter="56699" length="9483" />
      <page pageid="1812" ns="0" title="Super Mario Sunshine" contentmodel="wikitext" pagelanguage="en" touched="2015-12-03T17:50:06Z" lastrevid="40217" counter="53332" length="5841" />
      <page pageid="1857" ns="0" title="Quake II" contentmodel="wikitext" pagelanguage="en" touched="2010-10-05T10:11:43Z" lastrevid="5216" counter="18880" length="5201" />
      <page pageid="1903" ns="0" title="New Super Mario Bros. Wii" contentmodel="wikitext" pagelanguage="en" touched="2013-05-16T00:24:42Z" lastrevid="33308" counter="58857" length="3101" />
      <page pageid="1971" ns="0" title="Metroid Prime/Speed Tricks" contentmodel="wikitext" pagelanguage="en" touched="2012-10-25T21:26:10Z" lastrevid="14510" counter="12644" length="3955" />
      <page pageid="1972" ns="0" title="Metroid Prime/Boss Tricks" contentmodel="wikitext" pagelanguage="en" touched="2010-07-29T11:00:54Z" lastrevid="5508" counter="6267" length="39" />
      <page pageid="1973" ns="0" title="Metroid Prime/Version Differences" contentmodel="wikitext" pagelanguage="en" touched="2010-07-29T11:00:54Z" lastrevid="5509" counter="6777" length="39" />
      <page pageid="1974" ns="0" title="Metroid Prime/Secret Worlds" contentmodel="wikitext" pagelanguage="en" touched="2010-07-29T11:00:54Z" lastrevid="5450" counter="6933" length="40" />
      <page pageid="1987" ns="0" title="Metroid Prime 2: Echoes/Techniques" contentmodel="wikitext" pagelanguage="en" touched="2013-06-21T13:26:04Z" lastrevid="34882" counter="15838" length="10041" />
      <page pageid="1989" ns="0" title="Metroid Prime 2: Echoes/Early Items" contentmodel="wikitext" pagelanguage="en" touched="2013-06-25T22:06:01Z" lastrevid="35014" counter="10335" length="4405" />
    </pages>
  </query>
</api>