<$list filter="[tag[.bas]first[10]]">
print "{{!!title}}"
</$list>
Totally ridiculous example, and not at all practical (the BAM console window is an HTML canvas, and does not handle screen scrolling/wrapping at all.) But imagine graphics, or text processing returned to TiddlyWiki via browser local/session storage.
Or dynamically generating BASIC code at runtime. Like DATA statements, or anything else imaginable.
This works because of wikification of a BASIC program before dynamically creating the HTML that will be fed to an iframe.
Although I doubt it will ever be a problem, it is important to make sure that there is absolutely nothing in BASIC syntax that could be mistakenly wikified.