November 2001
Intermediate to advanced
936 pages
68h 43m
English
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Document Color Properties
The bgColor
,
fgColor, linkColor,
alinkColor, and vlinkColor
properties
of the
Document
object specify foreground, background, and
link colors for the document.
They are read/write properties, but they can be set only before the
<body> tag is parsed. You can set them
dynamically with JavaScript code in the
<head>
section of a document,
or you can set them statically as attributes of the
<body>
tag, but you cannot set
them elsewhere.
The exception to this rule is the
bgColor property. In many browsers, you can set
this property at any time; doing so causes the background color of
the browser window to change.[49] Other than bgColor,
the color properties of the Document object merely expose attributes
of the <body> tag and are basically
uninteresting.
Each of these color properties has
a string value. To set a color, you can use one of the predefined
HTML color names, or you can specify the color as
red, green, and blue color values,
expressed as a string of six hexadecimal digits in the form
#
RRGGBB. You may recall
that Example 13-7 set the
bgcolor
attribute of the
<body> tag to a color string expressed in
this fashion.
In the W3C DOM
standard, the color properties of the Document object are deprecated
in favor of properties of the Element object that represents the
<body> tag. Furthermore, the HTML 4 standard
deprecates the color attributes of the
<body> tag in favor of CSS style sheets. What this means is that you probably should not write scripts ...