HTML and CSS Reference
In CSS3, presentational hints from outside CSS are treated as if they belong to the user
agent's style sheet, presumably at the end (although as of this writing, the specification
Perhaps the most fundamental aspect of Cascading Style Sheets is the cascade itself—
the process by which conflicting declarations are sorted out and from which the final
document presentation is determined. Integral to this process is the specificity of se-
lectors and their associated declarations, and the mechanism of inheritance.