Definition and Usage
An element whose contents are not user-alterable is :read-only. However, elements whose contents are user-alterable (such as text input fields) are considered to be in a :read-write state. In typical documents, most elements are :read-only. However it may be possible (e.g. in the context of an editor) for any element to become :read-write.
Syntax
element:read-only { style properties }
Examples
input:read-only { color: #888888; font-weight: bold; }