The chaotic proliferation of overly-specific formatting tags can make HTML authoring an exercise in frustration. Style sheets simplify formatting by allowing authors to associate various properties -- such as font, size, color, margins, background, etc. -- with any tag. Style sheets can be embedded in the head of an HTML document or kept in external files usable with any number of related documents.

There are two basic element types in HTML: block and inline. Block elements include paragraphs, headings, blah blah blah

Properties are what are declared .