This virtual style element indicates text that should have strong
emphasis. It is usually rendered as bold text. This is a basic HTML
element that all browsers should support in some fashion.
Many people use this element interchangeably with B
(Bold.) If the aim is to make text explicitly bold, then use B - If the
intention is to place a heavy emphasis on a passage of text, STRONG is
the preferred element to use.
Text based or some other types of browsers may not be able to render
the B element, but the STRONG element implies that the contained text
should be brought to very high prominence, no matter the display
method used.