What are the linguistic characteristics of English newspaper headlines?their grammar and vocabulary

Normally, headline writers follow the basics
below:

1.  They omit articles
(a, an, the) in order to save space but also to attract the reader's attention to the
most significant words.

2. Headlines use
strong active verbs, avoiding "be" verbs and passive voice
which slow down fluidity and again take up too much space with very little substance. 
An example is: "Man Awakens To Horrific Smell!"  instead of, "A man is awakened by a
horrific smell!"

3.  Unusual
Capitalization--normally each word in a headline is capitalized
(sometimes the headline is even in all caps).  So, even though Standard English does not
call for the capitalization of prepositions in titles, headlines capitalize them for
uniformity purposes.

4.  Many times, headlines
omit end punctuation or punctuation of any
kind.