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="Linux/nginx/php動作|958" />
  </query-continue>
  <query>
    <pages>
      <page pageid="946" ns="0" title="Cms/mediawiki/ゲストの書き込みを禁止" />
      <page pageid="947" ns="0" title="Html/速度改善" />
      <page pageid="962" ns="0" title="Linux/nginxインストール" />
      <page pageid="999" ns="0" title="Cms/mediawiki/h1タイトルをリンク化" />
      <page pageid="1001" ns="0" title="Linux/nginx/faviconリライト" />
      <page pageid="1005" ns="0" title="Google検索" />
      <page pageid="1006" ns="0" title="Google検索/特殊検索" />
      <page pageid="1007" ns="0" title="Google検索/カスタム検索" />
      <page pageid="1033" ns="0" title="Google/問い合わせフォーム作成" />
      <page pageid="1785" ns="0" title="Gcp/firebase" />
    </pages>
  </query>
</api>