Super easy to sanitize a textarea input or any other input.

This method includes a way to sanitize and then add <br> for line breaks.

###############
Mivascript: 
###############

<MvASSIGN NAME = "l.sanitized" VALUE = "{ miva_html_strip( l.unsanitized, l.null ) }" />
<MvASSIGN NAME = "l.sanitized" VALUE = "{ glosub( l.sanitized, asciichar(10), '
' ) }" />

<p>
	<MvEVAL EXPR = "{ l.sanitized }">
</p>

###############
Storemorph/SMT:
###############

<mvt:aasign name="l.settings:sanitized" value="miva_html_strip(g.unsanitized,l.null)" />
<mvt:assign name="l.settings:sanitized" value="glosub(l.sanitized,asciichar(10),'
')" />

<p>
	&mvt:sanitized;
</p>

At this point you don't need to use encodeentities(...) or &mvte:something; because there is nothing left to encode. JS, HTML, inline script/js, nothing is left over from miva_html_strip(...)