<mark>
The
mark
element
represents a run of text in one document marked or highlighted for reference purposes, due
to its relevance in another context. When used in a quotation or other block of text
referred to from the prose, it indicates a highlight that was not originally present
but which has been added to bring the reader's attention to a part of the text that
might not have been considered important by the original author when the block was
originally written, but which is now under previously unexpected scrutiny. When used
in the main prose of a document, it indicates a part of the document that has been
highlighted due to its likely relevance to the user's current activity.