issue2551098: markdown links missing rel="noreferer nofollow" Links generated by all markdown backends are missing the noopener and nofollow relation that roundup's normal text -> html core adds to prevent security issues and link spam. Now rel="nofollow" is added to links generated by markdown2 backends and rel="nofollow noopener" for mistune and markdown backends. Markdown2 isn't as programable as the other two backends so I used the built-in nofollow support. This means that a user that generates a link that opens in a new window can manpulate the parent window.

<tal:block metal:use-macro="templates/page/macros/icing">
<title metal:fill-slot="head_title"
 i18n:translate="">Registration in progress - <span i18n:name="tracker"
 tal:replace="config/TRACKER_NAME" /></title>
<span metal:fill-slot="body_title" tal:omit-tag="python:1"
 i18n:translate="">Registration in progress...</span>
<td class="content" metal:fill-slot="content">

<p i18n:translate="">You will shortly receive an email
to confirm your registration. To complete the registration process,
visit the link indicated in the email.
</p>

</td>
</tal:block>