In Semantic UI we include two distinct header types that sized using either REM or EM. Page headings which are generally consistent across a site and usually sp

In Semantic UI we include two distinct header types that sized using either REM or EM. Page headings which are generally consistent across a site and usually specified with H1-H5, are sized using REMs so they display consistently. Sizing variations, (tiny, small, large, huge etc) however use EM to allow them to be sized relative to its content container.