the mark element (or <mark> tag) is one of the elements that form the proposed W3C HTML5 Specification. mark represents a run of text in one document marked or highlighted for reference purposes, due to its relevance in another context

For example it can be used by authors to draw attention to relevent text within a quote as above, or to highlited search terms within a document.

For more information about the mark atribute why not visit the W3C HTML5 Specification

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