isolation

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

Try it

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

Syntax

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

/* Global values */
isolation: inherit;
isolation: initial;
isolation: revert;
isolation: revert-layer;
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 typeNot animatable

Formal syntax

isolation = 
  <isolation-mode>  

<isolation-mode> = 
  auto     |
  isolate

Examples

Forcing a new stacking context for an element

HTML

html
<div class="big-square ">
  <div class="isolation-auto">
    <div class="small-square">auto</div>
  </div>
  <div class="isolation-isolate">
    <div class="small-square">isolate</div>
  </div>
</div>

CSS

css
.isolation-auto {
  isolation: auto;
}

.isolation-isolate {
  isolation: isolate;
}

.big-square {
  background-color: rgb(0, 255, 0);
  width: 200px;
  height: 210px;
}

.small-square {
  background-color: rgb(0, 255, 0);
  width: 100px;
  height: 100px;
  border: 1px solid black;
  padding: 2px;
  mix-blend-mode: difference;
}

Result

Specifications

Specification
Compositing and Blending Level 2
# isolation

Browser compatibility

BCD tables only load in the browser

See also