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.
Working Draft Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support No support[3] No support[2] ? ? 9.1[1]
Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support No support[3] No support[2] ? ? 9.3[1]

[1] See WebKit bug 149702.

[2] See bug 1215878.

[3] See Chromium bug 579788

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.

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