HTML and CSS Reference
3.9. Editorial Markup
HTML 4.0 introduced two tags that can help groups of authors collaborate
in the development of documents and maintain some semblance of ed-
itorial and version control. The insert ( <ins> ) and delete ( <del> ) tags re-
spectively let you either designate portions of your document's body as
new or added content or designate old stuff that should be replaced.
And with special attributes, you can indicate when you made the change
( datetime ) and a reference to a document that may explain the change
( cite ).
3.9.1. The <ins> and <del> Tags
The <ins> and <del> tags let authors set off portions of body content that
they intend to add to or delete from the current versions of their doc-
uments. HTML 4/XHTML-compliant browsers display the contents of the
<ins> and <del> tags in some special way so that readers can quickly scan
the document for the changes.