The INS element is one of two elements used (the other being DEL)
to allow revision control in HTML documents. The INS element is
nest-able and can be used in conjunction with the DEL element to
indicate content and/or markup which has been inserted after the
document's initial creation. A date stamp is used to mark when the
change was made and no destructive changes are ever made to the
document. This is useful in areas such as the legal profession where
historical change information is important.
HTML documents containing revision annotations will contain all
content and markup ever applied to the document. Browsers that can
interpret the DEL and INS elements could possibly display the
"current" state of the document or display all content
with a common visual cues for inserted or deleted text. More
advanced revision systems could allow for chronological snapshots of
a document at any point in its history.
