isolation

The isolation CSS property determines whether an element must create a new stacking context.

This property is especially helpful when used in conjunction with mix-blend-mode and z-index.

Syntax

/* Keyword values */
isolation: auto;
isolation: isolate;

/* Global values */
isolation: inherit;
isolation: initial;
isolation: unset;

The isolation property is specified as one of the keyword values listed below.

Values

auto
A new stacking context is created only if one of the properties applied to the element requires it.
isolate
A new stacking context must be created.

Formal definition

Initial valueauto
Applies toAll elements. In SVG, it applies to container elements, graphics elements, and graphics referencing elements.
Inheritedno
Computed valueas specified
Animation typediscrete

Formal syntax

auto | isolate

Examples

Forcing a new stacking context for an element

HTML

<div id="b" class="a">
  <div id="d">
    <div class="a c">auto</div>
  </div>
  <div id="e">
    <div class="a c">isolate</div>
  </div>
</div>

CSS

.a {
  background-color: rgb(0,255,0);
}
#b {
  width: 200px;
  height: 210px;
}
.c {
  width: 100px;
  height: 100px;
  border: 1px solid black;
  padding: 2px;
  mix-blend-mode: difference;
}
#d {
  isolation: auto;
}
#e {
  isolation: isolate;
}

Result

Specifications

Specification Status Comment
Compositing and Blending Level 1
The definition of 'Isolation' in that specification.
Candidate Recommendation Initial definition

Browser compatibility

BCD tables only load in the browser

See also