revert
CSS keyword reverts the cascaded value of the property from its current value to the value the property would have had if no changes had been made by the current
style origin
to the current element.
Thus, it resets the property to its inherited value if it inherits from its parent or to the default value established by the user agent's stylesheet (or by user styles, if any exist). It can be applied to any CSS property, including the CSS shorthand
all
.
This removes from the cascade all of the styles that have been overridden until the style being rolled back to is reached.
revert
rolls back the property's cascaded value to the user's custom style, if one exists; otherwise, it rolls the style back to the user agent's default style.
revert
rolls back the cascaded value to the user agent's default style.
unset
.
revert
keyword works exactly the same as
unset
in many cases. The only difference is for properties that have values set by the browser or by custom stylesheets created by users (set on the browser side).
Revert will not affect rules applied to children of an element you reset (but will remove effects of a parent rule on a child). So if you have a
color: green
for all sections and
all: revert
on a specific section the color of the section will be black. But if you have a rule to make all paragraphs red then all paragraphs will still be red in all sections.
Revert is just a value. It is still possible to override
revert
value using
specificity
.
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.
例如，
initial value
为
display
特性为
inline
, whereas a normal user-agent stylesheet sets the default
display
value of
<div>
s to
block
, of
<table>
s to
table
，等。
Although
revert
and
unset
are similar they differ for some properties for some elements.
So in the below example, we set custom
font-weight
in a global stylesheet, but then try to unset and revert. Unset will keep the text normal because this is an initial value for font-weight property. Revert will revert to bold because this is a default value for headers in most browsers.
h3 {
font-weight: normal;
color: blue;
}
<h3 style="font-weight: unset; color: unset;">This will still have font-weight: normal, but color: black</h3> <p>Just some text</p> <h3 style="font-weight: revert; color: revert;">This should have its original font-weight (bold) and color: black</h3> <p>Just some text</p>
Reverting all values is useful when you did heavy modifications for something and then want to revert to defaults. So to iterate on above example instead of reverting font-weight and color separately you could just revert all of them.
h3 {
font-weight: normal;
color: blue;
border-bottom: 1px solid grey;
}
<h3>This will have custom styles</h3> <p>Just some text</p> <h3 style="all: revert">This should be reverted to browser/user defaults</h3> <p>Just some text</p>
Reverting effectively removes the value for the element you select with some rule and only for that element. To illustrate this we will set a green color on a section and red color on a paragraph.
section { color: darkgreen }
p { color: red }
section.with-revert { color: revert }
<section> <h3>This will be dark green</h3> <p>Text in paragraph will be red.</p> This will also be dark green. </section> <section class="with-revert"> <h3>This will be black</h3> <p>Text in paragraph will be red.</p> This will also be black. </section>
Notice how paragraph still has a red color even though a color property for the section was reverted. Also note that both the header and plain text node is black. This is exactly the same as if
section { color: darkgreen }
would not exist for the second section.
| 规范 | 状态 | 注释 |
|---|---|---|
|
CSS Cascading and Inheritance Level 4
The definition of 'revert' in that specification. |
候选推荐 | 初始定义。 |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
revert
|
Chrome
不支持
No
注意事项
|
Edge
不支持
No
注意事项
|
Firefox 完整支持 67 | IE 不支持 No | Opera 不支持 No | Safari 完整支持 9.1 |
WebView Android
不支持
No
注意事项
|
Chrome Android
不支持
No
注意事项
|
Firefox Android 完整支持 67 | Opera Android 不支持 No | Safari iOS 完整支持 9.3 |
Samsung Internet Android
不支持
No
注意事项
|
完整支持
不支持
见实现注意事项。
initial
to set a property to its initial value.
unset
to set a property to its inherited value if it inherits, or to its initial value if not.
inherit
to make an element's property the same as its parent.
all
property lets you reset all properties to their initial, inherited, reverted, or unset state at once.