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isolation

The isolation CSS property determines whether an element must create a new {{glossary("stacking context")}}.

{{EmbedInteractiveExample("pages/css/isolation.html")}}

This property is especially helpful when used in conjunction with {{cssxref("mix-blend-mode")}} and {{cssxref("z-index")}}.

Syntax​

/* 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​

Formal syntax​

Examples​

Forcing a new stacking context for an element​

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​

.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​

{{ EmbedLiveSample('Forcing_a_new_stacking_context_for_an_element', 230, 230) }}

Specifications​

Browser compatibility​

See also​

  • {{cssxref("<blend-mode>")}}
  • {{cssxref("mix-blend-mode")}}, {{cssxref("background-blend-mode")}}