Reference: *Style Attribute Module at the W3C
The Style Attribute Module declares only attributes.
The Style Attribute Module declares the following Common Attribute in the Core Attribute Collection:
This module is deprecated: see the W3C page
on *The XHTML 1.1 Document Type.
Use of this module is discouraged in order to promote the separation of style from content.
The Style Attribute Module declares the
style attribute,
which may be applied to most elements in order to assign element-specific style
declarations directly within the XHTML.
For CSS styles, declarations made using
the style attribute
have higher precedence than other declarations applying to the same element, for the
same degree of importance
(Ref: *W3C CSS 2.1; The Cascade).
If you use the style
attribute in your document, you should indicate the MIME
type of the style declarations (typically "text/css") in a Content-Style-Type
HTTP header.