H1-H6 font sizes in HTML

Question

In HTML (and in typography in general, I suppose), there appears to be some defined sizes for H1-H6 -elements.

Ie., if the baseline font size is 16px (or 100%), then h1

Answer 1

Many of them say different sizes for heading tags but there was a variation from bootstrap to default font-size.here mentioned are default font-sizes:

h1 { font-size: 24px;}
h2 { font-size: 22px;}
h3 { font-size: 18px;}
h4 { font-size: 16px;} 
h5 { font-size: 12px;} 
h6 { font-size: 10px;}