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>
  <compare fromrevid="1" torevid="2" xml:space="preserve">&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Строка 4:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Строка 4:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td class='diff-context'&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td class='diff-context'&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td class='diff-context'&gt;&lt;div&gt;== Некоторые полезные ресурсы ==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td class='diff-context'&gt;&lt;div&gt;== Некоторые полезные ресурсы ==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td class='diff-deletedline'&gt;&lt;div&gt;* [//www.&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;mediawiki&lt;/del&gt;.&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;org&lt;/del&gt;/&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;wiki/Manual:Configuration_settings Список возможных настроек&lt;/del&gt;];&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td class='diff-addedline'&gt;&lt;div&gt;* [//www.&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;komiteatr&lt;/ins&gt;.&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;ru&lt;/ins&gt;/ &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;КОМИТЕАТР Официальный сайт театра&lt;/ins&gt;];&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td class='diff-deletedline'&gt;&lt;div&gt;* [//&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;www&lt;/del&gt;.&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;mediawiki&lt;/del&gt;.&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;org&lt;/del&gt;/&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;wiki/Manual:FAQ Часто задаваемые вопросы и ответы по MediaWiki&lt;/del&gt;];&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td class='diff-addedline'&gt;&lt;div&gt;* [//&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;shop&lt;/ins&gt;.&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;komiteatr&lt;/ins&gt;.&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;ru&lt;/ins&gt;/ &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;Лавка КОМИТЕАТР Интернет магазин театра&lt;/ins&gt;];&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td class='diff-deletedline'&gt;&lt;div&gt;&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;* [https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce Рассылка уведомлений о выходе новых версий MediaWiki].&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td class='diff-addedline'&gt;&lt;div&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td class='diff-deletedline'&gt;&lt;div&gt;&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;* [//www.mediawiki.org/wiki/Localisation#Translation_resources Перевод MediaWiki на свой язык]&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td class='diff-addedline'&gt;&lt;div&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
</compare>
</api>