Example of <h1> without applying any styles. What you get depends on your browser's defaults.
Example of <h1> with applying an inline style
Example of an embedded style. Embedded styles are applied in the <head> section using the <style> tag. Note I did not need to use a <font> tag.
This is in <h3>. Because I grouped styles together in my embedded styles, it has the same characteristics as <h2>.
<h4> uses a different style group, so it gives a different appearance.
<h5> is in the same group as <h4>
<h6> is in the same group as <h4>