Block elements: headings and paragrahs

All headings are boldface.

h1 is 200% of base font size

h2 is 150% of base font size

h3 is 117% of base font size

h4 is 100% of base font size

h5 is 83% of base font size
h6 is 67% of base font size
Here's some text I want to do something with eventually, using css.

Maybe I want to something different with this text.

Span elements do not have to have unique id's. Here I will format a special word that should be formatted in the same way as a previous phrase with the same id.