revert CSS keyword rolls back the cascade so that the property takes on the value it would have had if there were no styles in the current style origin (author, user, or user-agent). In author stylesheets (the normal case), for the purposes of the given declaration, it's as if there were no author-level styles, thus resetting the property to the default value established by the user-agent stylesheet (or by user styles, if any exist).
revert keyword is different from and should not be confused with
initial, which uses the initial value defined on a per-property basis by the CSS specifications. By contrast, user-agent stylesheets set default values on the basis of CSS selectors. For example, the initial value for the
display property is
inline, whereas a normal user-agent stylesheet sets the default
display value of
revert keyword is useful for isolating embedded widgets/components from the styles of the page that contains them, particularly when used with the
In user stylesheets,
revert rolls back the cascade and resets the property to the default value established by the user-agent stylesheet.
This article is currently a stub and is missing an example.
|CSS Cascading and Inheritance Level 4
The definition of 'revert' in that specification.
|Working Draft||Initial definition|
|Feature||Chrome||Firefox (Gecko)||Internet Explorer||Opera||Safari (WebKit)|
|Basic support||?||Not supported||?||?||9.1|
|Feature||Android||Firefox Mobile (Gecko)||IE Phone||Opera Mobile||Safari Mobile|
|Basic support||?||Not supported||?||?||9.3|
 See WebKit bug 149702.
 See bug 1215878.