The revert CSS keyword rolls back the cascade so that a property takes on the value it would have had if there were no styles in the current style origin (author, user, or user-agent). Thus, it resets the property to the default value established by the user-agent stylesheet (or by user styles, if any exist). It can be applied to any CSS property, including the CSS shorthand all.

The revert keyword is useful for isolating embedded widgets or 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.

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. In 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.



  <p>This is a section!</p>

  <aside class="widget">
    <p>This is a little widget.</p>


section {
  color: blue;
  font-family: sans-serif;
  font-weight: bold;

.widget {
  all: revert;



Specification Status Comment
CSS Cascading and Inheritance Level 4
The definition of 'revert' in that specification.
Candidate Recommendation Initial definition.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support No1 No2 No3 No No9.1
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support No1 No1 No2 No3 No9.3 No

1. See bug 579788.

2. See this enhancement request.

3. See bug bug 1215878.

See also

  • Use initial to set a property to its initial value.
  • Use unset to set a property to its inherited value if it inherits, or to its initial value if not.
  • Use inherit to make an element's property the same as its parent.
  • The all property lets you reset all properties to their initial, inherited, reverted, or unset state at once.

Document Tags and Contributors

Last updated by: Sheppy,