For something static like this that should work on every view, you could also use something like this to inject the script directly on the page without markdown
Soo i got something for you
Create these files (and injectables folder) (depending on install folder ofc)
"C:\Program Files\Inductive Automation\Ignition\data\modules\com.inductiveautomation.perspective\injectables\head_bottom.txt"
"C:\Program Files\Inductive Automation\Ignition\webserver\webapps\main\newFavicon.ico"
In the head_bottom.txt put this:
<script>
const oldLinks = document.querySelectorAll('link[rel*="icon"]');
oldLinks.forEach(e => {e.href = '/newFavicon.ico';});
</script>…