What is the editorial liner in an editorial page?

Editorial liner is a quotation used to fill in a gap or space in the newspaper. It is usually done if the space left is very small.

Editorials are basically articles in a newspaper that expresses the writers own opinion over something. Example: (an abortion editorial) Abortions in the eyes of most humans is wrong and should be...

editorial page

printed in this section is articles

And editorial is an article about a subject.