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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>
    <revisions rvcontinue="2160" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page">
        <revisions>
          <rev user="Wolfgang Fahl" timestamp="2018-11-06T11:19:32Z" comment="" />
          <rev user="LordOfBikes" timestamp="2018-04-10T16:25:09Z" comment="added Link &#039;LibreCAD Manuals Summary&#039; in Usage section" />
          <rev user="Feragon" timestamp="2018-01-30T18:35:55Z" comment="" />
          <rev user="R. van Twisk" timestamp="2017-03-12T16:04:41Z" comment="" />
          <rev user="Ravas" timestamp="2017-03-01T22:28:00Z" comment="updated the &#039;Things We Need&#039;" />
        </revisions>
      </page>
    </pages>
  </query>
</api>