Paste any valid xml (with namespace to a mantis note):

e.g.:

<x xmlns:edi='http://ecommerce.example.org/schema'>

<!-- the "edi" prefix is bound to http://ecommerce.example.org/schema

for the "x" element and contents -->

</x>

Submit the Note.

In the mantis view page "copy" the xml and it is invalid now:

<x xmlns:edi='http://ecommerce.example.org/schema'> [^]

<!-- the "edi" prefix is bound to http://ecommerce.example.org/schema [^]

for the "x" element and contents -->

</x>

(to be clear what I mean you need to view this "Steps To Reproduce" via Edit or with $g_html_make_links = OFF)