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" />
  </query-continue>
  <query>
    <pages>
      <page pageid="246" ns="0" title="BEAR3 compression" />
      <page pageid="244" ns="0" title="BEAR4 compression" />
      <page pageid="205" ns="0" title="Different implementations of a Collatz iterator and their performance" />
      <page pageid="203" ns="0" title="Different implementations of a simple Collatz iterator and their performance" />
      <page pageid="44" ns="0" title="Extremely simple pulse width modulation regulator" />
      <page pageid="187" ns="0" title="Instruction set: CIL" />
      <page pageid="261" ns="0" title="Locally optimal optimisation of code fragments" />
      <page pageid="18" ns="0" title="Multiplication" />
      <page pageid="50" ns="0" title="PIC: Multiplication" />
      <page pageid="322" ns="0" title="Raspberry Pi 3" />
    </pages>
  </query>
</api>