.show() methods, without any
parameters, can be thought of as smart shorthand methods for
.css('display', 'string'), where
'string' is the appropriate display value. The effect, as might be expected, is that the matched set of elements will be immediately hidden or shown with no animation.
.hide() method sets the inline style attribute of the matched set of elements to
display: none. The smart part here is that it remembers the value of the display property—typically
inline-block—before it was changed to
none. Conversely, the
.show() method restores the display properties of the matched set of elements to whatever they initially were before
display: none was applied.