如何在bootstrap_alert中放置链接？

Question

如何在bootstrap_alert中放置一个链接？

msg=mark_safe('Please visit our forum site <a href="talk.edgle.com" class="alert-link">Edgle Talk</a> as well!')

render_alert(msg)
'<div class="alert alert-info alert-dismissable"><button type="button" class="close" data-dismiss="alert" aria-hidden="true">&times;</button>Please visit our forum site &lt;a href=&quot;talk.edgle.com&quot; class=&quot;alert-link&quot;&gt;Edgle Talk&lt;/a&gt; as well!</div>'

如所见，由于以下函数调用链，html元素被转义：

bootstrap_alert-> render_alert-> render_tag-> format_html-> conditional_escape