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>
    <pageswithprop pwpcontinue="723" />
  </query-continue>
  <query>
    <pageswithprop>
      <page pageid="417" ns="0" title="ITDB02-1.8SP/en" value="ITDB02-1.8SP" />
      <page pageid="428" ns="0" title="ITDB02-2.8/en" value="ITDB02-2.8" />
      <page pageid="464" ns="0" title="Mini Rboard/en" value="Mini Rboard" />
      <page pageid="475" ns="0" title="Mini Rboard/zh" value="Mini Rboard" />
      <page pageid="507" ns="0" title="RASPBERRY PI OLED ADD-ON/en" value="RASPBERRY PI OLED ADD-ON" />
      <page pageid="513" ns="0" title="RASPBERRY PI OLED ADD-ON/zh-cn" value="树莓派OLED模块" />
      <page pageid="541" ns="0" title="RASPBERRY PI Arduino Shield ADD-ON/en" value="RASPBERRY PI Arduino Shield ADD-ON" />
      <page pageid="577" ns="0" title="ITDB02-2.2S/en" value="ITDB02-2.2S" />
      <page pageid="643" ns="0" title="ITDB02-2.4S/en" value="ITDB02-2.4S" />
      <page pageid="672" ns="0" title="IR Shield/en" value="IR Shield" />
    </pageswithprop>
  </query>
</api>