The use of HTML elements and attributes for specifying color is deprecated [p.34] . You are
encouraged to use style sheets [p.171] instead.
Don't use color combinations that cause problems for people with color blindness in its various
If you use a background image or set the background color, then be sure to set the various text colors
Colors specified with the BODY and FONT elements and bgcolor on tables look different on
different platforms (e.g., workstations, Macs, Windows, and LCD panels vs. CRTs), so you shouldn't
rely entirely on a specific effect. In the future, support for the [SRGB] [p.328] color model together
with ICC color profiles should mitigate this problem.
When practical, adopt common conventions to minimize user confusion.
HTML specifies three types of length values for attributes:
1. Pixels: The value (%Pixels; [p.257] in the DTD) is an integer that represents the number of pixels of
the canvas (screen, paper). Thus, the value "50" means fifty pixels. For normative information about
the definition of a pixel, please consult [CSS1] [p.327] .
2. Length: The value (%Length; [p.257] in the DTD) may be either a %Pixel; or a percentage of the
available horizontal or vertical space. Thus, the value "50%" means half of the available space.
3. MultiLength: The value ( %MultiLength; [p.257] in the DTD) may be a %Length; or a relative
length. A relative length has the form "i*", where "i" is an integer. When allotting space among
elements competing for that space, user agents allot pixel and percentage lengths first, then divide up
remaining available space among relative lengths. Each relative length receives a portion of the
available space that is proportional to the integer preceding the "*". The value "*" is equivalent to
"1*". Thus, if 60 pixels of space are available after the user agent allots pixel and percentage space,
and the competing relative lengths are 1*, 2*, and 3*, the 1* will be alloted 10 pixels, the 2* will be
alloted 20 pixels, and the 3* will be alloted 30 pixels.
Length values are case-neutral. [p.43]
6.7 Content types (MIME types)
Note. A "media type" (defined in [RFC2045] [p.328] and [RFC2046] [p.328] ) specifies the nature of a
linked resource. This specification employs the term "content type" rather than "media type" in
accordance with current usage. Furthermore, in this specification, "media type" may refer to the media
[p.49] where a user agent renders a document.
This type is represented in the DTD by %ContentType;. [p.252]
Content types are case-insensitive. [p.43]
Examples of content types include "text/html", "image/png", "image/gif", "video/mpeg", "audio/basic",
consult [MIMETYPES]. [p.327]