Inheritance

When no value for an inherited property has been specified on an element, the element gets the computed value of that property on its parent element. Only the root element of the document gets the initial value given in the property's summary.

A typical example of an inherited property is the color property. Consider the following style rules and the markup:

p {
  color: green;
}

<p>This paragraph has <em>emphasized text</em> in it.</p>

The words "emphasized text" will appear green, since the em element has inherited the value of the color property from the p element. It does not get the initial value of the property (which is the color that is used for the root element when the page specifies no color).

When no value for a non-inherited property has been specified on an element, the element gets the initial value of that property (as specified in the property's summary).

A typical example of a non-inherited property is the border property. Consider the following style rules and the markup:

p {
  border: medium solid;
}

<p>This paragraph has <em>emphasized text</em> in it.</p>

The words "emphasized text" will not have another border (since the initial value of border-style is none).

The inherit keyword allows authors to explicitly specify inheritance. It works on both inherited and non-inherited properties.

You can control inheritance for all properties at once using the all shorthand property, which applies its value to all properties. For example:

p {
  all: revert;
  font-size: 200%;
  font-weight: bold;
}

This reverts the style of the paragraphs' font property to the user agent's default unless a user stylesheet exists, in which case that is used instead. Then it doubles the font size and applies a font-weight of "bold".

Using our previous example with border, if we explicitly set the inheritance with inherit, we get the following:

p {
  border: medium solid;
}

em {
  border: inherit;
}

<p>This paragraph has <em>emphasized text</em> in it.</p>

We can see here another border around the word "emphasized text".

• CSS values for controlling inheritance: inherit, initial, revert, revert-layer, and unset
• Introducing the CSS cascade
• Cascade, specificity, and inheritance
• CSS key concepts:
  • CSS syntax
  • At-rules
  • Comments
  • Specificity
  • Box model
  • Layout modes
  • Visual formatting models
  • Margin collapsing
  • Values
    • Initial values
    • Computed values
    • Used values
    • Actual values
  • Value definition syntax
  • Shorthand properties
  • Replaced elements