[Jenkins Wiki](https://wiki.jenkins-ci.org/) shows patron messages through the "Page Templates" where the following code block is inserted:
```html
<script>
if (Math.random()*7<1){
document.write("<divalign='center'><divstyle='width: 568px; color: #888; text-align:right; font-size:10px'>Message from a Patron of Jenkins</div><iframesrc='https://jenkins-infra.github.io/patron/message.html'width=568height=75style='border: 1px solid #ccc; overflow:hidden'></iframe></div>");