It is best practice to use a CSS file to style your website rather than including CSS in the head of
individual HTML files.
CSS files can be stacked or layered by linking several to a file. Each file can supercede styles in files listed above it, allowing
you to adopt most styles from one sheet and then change a few using another.
referential links within the CSS file should be calculated from that file (not from the HTML the CSS file is linked to)
New Tags Covered
<link>
this tag should be placed in the head section of the page and is used to link to external resources. It should
be used with a rel property to declare what type of resource is being linked to.
rel
property that can be used with link in order to declare the type of resource linked to. Valid values include
stylesheet and icon.