The 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).
The 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 <div>s to block, of <table>s to table, etc.
The revert keyword is useful for isolating embedded widgets/components from the styles of the page that contains them, particularly when used with the all property.
In user stylesheets, revert rolls back the cascade and resets the property to the default value established by the user-agent stylesheet.
Example
This article is currently a stub and is missing an example.
Specifications
| Specification | Status | Comment |
|---|---|---|
| CSS Cascading and Inheritance Level 4 The definition of 'revert' in that specification. |
Working Draft | Initial definition |
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | ? | Not supported[2] | ? | ? | 9.1[1] |
| Feature | Android | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | ? | Not supported[2] | ? | ? | 9.3[1] |
[1] See WebKit bug 149702.
[2] See bug 1215878.