There are 6 headings which have a pre-defined font and point size. It starts with H1 being the largest and H6 being the smallest. Below you'll see the HTML tag for each, followed by its corresponding output.

<H1>HTML Studio</H1> <H2>HTML Studio</H2> <H3>HTML Studio</H3> <H4>HTML Studio</H4> <H5>HTML Studio</H5> <H6>HTML Studio</H6>

is displayed as ...

HTML Studio

HTML Studio

HTML Studio

HTML Studio

HTML Studio
HTML Studio