CSS isolation Property

The isolation property allows to create a new stacking context. It can be used with the background-blend-mode and mix-blend-mode property.

In CSS, a background-image or the content of an <img> must always be rendered into an isolated group.

Initial Value auto
Applies to All elements.
Inherited No.
Animatable No.
Version CSS3
DOM Syntax Object.style.isolation = "isolate";

Syntax

isolation: auto | isolate | initial | inherit;

Example

<!DOCTYPE html>
<html>
  <head>
    <title>Title of the document</title>
    <style>
      .a {
      background-color: #ccc;
      }
      #isolation-example {
      width: 300px;
      height: 300px;
      }
      .c {
      width: 100px;
      height: 100px;
      border: 1px solid #000;
      padding: 10px;
      mix-blend-mode: difference;
      }
      #isolation-example1 {
      isolation: auto;
      }
      #isolation-example2 {
      isolation: isolate;
      }
    </style>
  </head>
  <body>
    <h2>Isolation property example</h2>
    <div id="isolation-example" class="a">
      <div id="isolation-example1">
        <div class="a c">isolation: auto;</div>
      </div>
      <div id="isolation-example2">
        <div class="a c">isolation: isolate;</div>
      </div>
    </div>
  </body>
</html>

Another example where the isolated part is black:

Example

<!DOCTYPE html>
<html>
  <head>
    <title>Title of the document</title>
    <style>
      * {
      box-sizing: border-box;
      }
      body {
      background-color: #eee;
      color: #555;
      font-size: 1.1em;
      font-family: Roboto, Helvetica, Arial, sans-serif;
      }
      .isolation-example {
      margin: 1em auto;
      width: 100%;
      max-width: 814px;
      position: relative;
      }
      img {
      width: 100%;
      }
      .isolation-example h1 {
      position: absolute;
      top: 5em;
      color: white;
      text-align: center;
      font-size: 40px;
      width: 100%;
      text-transform: uppercase;
      background-color: #000;
      padding: .5em .25em;
      mix-blend-mode: overlay;
      }
    </style>
  </head>
  <body>
    <h2>Isolation property example</h2>
    <div class="isolation-example">
      <img src="/uploads/media/default/0001/01/4982c4f43023330a662b9baed5a407e391ae6161.jpeg" alt="Yellow tree.">
      <div class="element">
        <h1>House</h1>
      </div>
    </div>
  </body>
</html>

Values

Value Description
auto Even if the property is set to auto, a stacking context is created in case background-blend-mode and mix-blend-mode are applied to the element. This is the default value of this property.
isolate Creates a stacking context on an element, and isolates the group.
initial Makes the property use its default value.
inherit Inherits the property from its parents element.




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