The second line of a multi-line tooltip generally desctribes the
additional information which helps the major text, i.e. the first
line of the multi-line tooltip, hence it would be a good idea to
add italics styling, to differentiate it from the main title. We
describe a simple ".italic" class for the same.
We also add a shorter line height to this description using the
".tooltip-inner-content" class.
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