Assertion:
INS and DEL can be nested. Because the only visual difference
is strike and underline, only simple nesting will have any visual effect. Nesting
INS within INS, for example, will look no different from a single INS element occurrence.
Nesting INS within DEL however will produce the necessary feedback.
Simple INS example:
filler text ins text filler text
Simple DEL example:
filler text del text filler text
INS nested inside INS example:
filler text ins1
ins2 ins1 filler text
DEL nested inside DEL example:
filler text del1
del2 del1 filler text
DEL nested inside INS example:
filler text ins1
del2 ins1 filler text
INS nested inside DEL example:
filler text del1
ins2 del1 filler text