What does ' ' stand for, and why is it used?( )
Non-breaking space': It tells the parser that it should not render this piece of whitespace
Non-browser space': It tells browsers to ignore the character, if they're reading any *ML document
Non-breaking space': It tells the parser that this particular piece of whitespace is worth rendering
Non-browser space': It tells browsers to ignore the character, if they're reading an XML document
