they haven't mentioned about <marquee> tag .. I just know that it can make text/ images slide on screen ...can anybody explain more about it

Answer 1

marquee tag is used to move text . basically it is defaultly moves right to left.
i forgot about types of marquee tool but i think that will be of 3or4 types

Answer 2

like attributes for marquee tag etc.

Answer 3

maybe because nobody uses marquee tag anymore? or it is "obsolete"? don't know the right term tho

Answer 4

<marquee> tag is use by professional to make site more beautiful