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Showing content from https://webplatform.github.io/docs/css/functions/invert below:

invert() · WebPlatform Docs

invert() Summary

Flips an element’s colors, for use by the filter property. A decimal value between 0 and 1 or percentage up to 100% controls the extent of the color-negative effect, with 0.5 or 50% producing gray.

This CSS property value is reflected in the following image:

filter: invert(100%);
filter: invert(1); /* same */

Examples

The following example shows the difference between two images, where one has a been inverted for 75%:

<!DOCTYPE html>
<html>
  <head>
    <title>Filter example</title>
    <style>
      .foo {
        float: left;
      }

      .bar {
        -webkit-filter: invert(75%);
      }
    </style>
  </head>
  <body>
    <img src="/logo/wplogo_transparent_xlg.png" class="foo" />
    <img src="/logo/wplogo_transparent_xlg.png" class="foo bar" />
  </body>
</html>

View live example

Notes

The CSS filter corresponds to this SVG filter definition, based on a variable amount passed to the function:

<filter id="invert">
  <feComponentTransfer>
    <feFuncR type="table" tableValues="[amount] (1 - [amount])"/>
    <feFuncG type="table" tableValues="[amount] (1 - [amount])"/>
    <feFuncB type="table" tableValues="[amount] (1 - [amount])"/>
  </feComponentTransfer>
</filter>

Related specifications

Filter Effects 1.0: Editor’s Draft
Filter Effects 1.0: Working Draft