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 initial 是将属性的初始值( initial value)赋给元素 . initial 适用于所有的css 属性(属性的initial值可在属性表中查到),包括css 简写属性(全局属性)all.

Note: On inherited properties, the initial value may be unexpected. You should consider using the inherit, unset, or revert keywords instead.

Example

HTML

<p>
  <span>This text is red.</span>
  <em>This text is in the initial color (typically black).</em>
  <span>This is red again.</span>
</p>

CSS

p {
  color: red;
}

em {
  color: initial;
}

Specifications

Specification Status Comment
CSS Cascading and Inheritance Level 4
initial
Candidate Recommendation No changes from Level 3.
CSS Cascading and Inheritance Level 3
initial
Candidate Recommendation Initial definition.

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 1.0 3.5 (1.9.1)-moz[1]
19.0 (19.0)
未实现 15.0 1.2
Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support 1.0 1.0 (1.9.1)-moz[1]
19.0 (19.0)
未实现 未实现 (Yes)

[1] From Firefox 1.0 onward, increasing support for -moz-initial was added in each version, culminating with the support for quotes in Firefox 3.5 (Gecko 1.9.1). The last addition was support for the non-standard -moz-border-*-colors in Firefox 3.6 (Gecko 1.9.2). Support for the prefixed -moz-initial keyword has been removed as of Firefox 24 in favor of the unprefixed initial keyword.

See also

  • Use unset to set a property to its inherited value if it inherits, or to its initial value if not.
  • Use revert to reset a property to the value established by the user-agent stylesheet (or by user styles, if any exist).
  • Use inherit to make an element's property the same as its parent.

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