why do headings keep on getting smaller?

Answer 1

Heading tags are used to mark importance on a scale of 1 - 6 ( 1 being the most important and 6 being the least ). They are then sized accordingly to make the most important stand out more.
Heading tags are not intended to be used for styling ( i.e. making text bold and big ).
I hope this helps.

Answer 2

it depend on heading tag u use.. if u use same heading tag (for example h1 for each heading) then size will not change.. h1 is used for largest font size and h6 for smallest font size..

Answer 3

The selection of the heading tag number depends on the importance level of the content. Most important ones can be used as h1 while the least important one can be given h6 tag.
it is very helpful while categorizing stuffs.