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Color Example
When colors are used as the sole method for identifying
screen elements or controls, persons who are color-blind, blind, or
have low vision may find the web page unusable.
Using color to enhance identification of important features is a
useful technique. However, some other method of identification,
such as text labels, must be combined with the use of color.
Beware of using color to not only indicate emphasized text,
but also to indicate an action. For example, a web page that
directs a user to "press the green button to start" should also
identify the green button in some other way than simply by
color.
Press the green button to start and red button to cancel.
source code for above :
<img src="button-green.gif" alt="this is the green button">
<img src="button-red.gif" alt="this is the red button">