Mardown Inline HTML not working in Wiki

Summary:

The use of raw HTML in Markdown does not work (in the Wiki). This issue was observed in version 7.0.0 and 7.1 (online)

Steps to reproduce:

Create/edit a Wiki page and enter some raw/inline HTML, such as the definition lists described in the Gitlab Flavored Markdown documentation https://gitlab.com/help/markdown/markdown#inline-html :

<dl>
 <dt>Definition list</dt>
 <dd>Is something people use sometimes.</dd>

 <dt>Markdown in HTML</dt>
 <dd>Does *not* work **very** well. Use HTML <em>tags</em>.</dd>
</dl>

The same problem occurs when using other HTML tags such as a tags to create links opened in new Tab.

Expected behavior:

The HTML is rendered correctly as seen in the Gitlab Flavored Markdown documentation.

Observed behavior:

The output is rendered incorrectly.