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>
    <allredirects garcontinue="STM32F103_Microcontroller|266" />
  </query-continue>
  <query>
    <pages>
      <page pageid="173" ns="0" title="PIC multiplication" />
      <page pageid="189" ns="0" title="Instruction set:CIL" />
      <page pageid="200" ns="0" title="Extremely simple switchregulator" />
      <page pageid="204" ns="0" title="Performance of different implementations of a simple Collatz iterator" />
      <page pageid="205" ns="0" title="Different implementations of a Collatz iterator and their performance" />
      <page pageid="208" ns="0" title="Multiplication algorithms" />
      <page pageid="245" ns="0" title="BEAR2 compression" />
      <page pageid="246" ns="0" title="BEAR3 compression" />
      <page pageid="262" ns="0" title="Locally optimal optimisation of boolean logic in code fragments" />
      <page pageid="323" ns="0" title="Raspberry pi 3" />
    </pages>
  </query>
</api>