Question

is it compulsory to write in capital letters while making a html program????​

Answer 1

Explanation:

if you write it in capital then write whole letter in capital if you write it in small then write whole in small

Answer 2

Answer:

The only relevant parts of specifications say:

HTML tag and attribute names are case insensitive.

XHTML tag and attribute names are case sensitive and must be lower case

Stuff that isn't mentioned in any standard:

Lower case is generally considered easier to read

Lower case is most common (and what people are used to working with)

Holding down the shift key or toggling CAPS LOCK all the time is a pain