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" />
  </query-continue>
  <query>
    <pages>
      <page pageid="933" ns="0" title="Cms/mediawiki/h1タイトルをパンクズ化" />
      <page pageid="942" ns="0" title="Cms/mediawiki/各種設定" />
      <page pageid="1778" ns="0" title="Gcp/Firebase" />
      <page pageid="217" ns="0" title="Google" />
      <page pageid="997" ns="0" title="Google/Google検索" />
      <page pageid="998" ns="0" title="Google/カスタム検索" />
      <page pageid="1008" ns="0" title="Google/スプレットシート/問い合わせフォーム作成" />
      <page pageid="490" ns="0" title="Html/パフォーマンスチューニング" />
      <page pageid="786" ns="0" title="Linux/nginx" />
      <page pageid="976" ns="0" title="Linux/nginx/favicon rewrite" />
    </pages>
  </query>
</api>