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>
    <allpages gapcontinue="スマホ用のおすすめモバイルバッテリー" />
  </query-continue>
  <query>
    <pages>
      <page pageid="7" ns="0" title="ZenFoneを利用するためにASUSアカウントは必要か？" contentmodel="wikitext" pagelanguage="ja" touched="2015-11-01T13:24:17Z" lastrevid="14" counter="" length="1535" />
      <page pageid="9" ns="0" title="iPad Pro" contentmodel="wikitext" pagelanguage="ja" touched="2015-11-08T07:54:24Z" lastrevid="30" counter="" length="4137" />
      <page pageid="15" ns="0" title="iPhoneのSafariの「リーダー表示を使用できます」とは" contentmodel="wikitext" pagelanguage="ja" touched="2015-12-29T15:09:56Z" lastrevid="39" counter="" length="1658" new="" />
      <page pageid="24" ns="0" title="iPhoneのメモリを短時間で簡単にクリアする方法" contentmodel="wikitext" pagelanguage="ja" touched="2017-10-29T11:51:28Z" lastrevid="64" counter="" length="1363" new="" />
    </pages>
  </query>
</api>