The color-adjust
CSS property sets what, if anything, the user agent may do to optimize the appearance of the element on the output device. By default, the browser is allowed to make any adjustments to the element's appearance it determines to be necessary and prudent given the type and capabilities of the output device.
Syntax
color-adjust: economy; color-adjust: exact;
The color-adjust
property's value must be one of the following keywords.
Values
economy
- The user agent is allowed to make adjustments to the element as it deems appropriate and prudent in order to optimize the output for the device it's being rendered for. For example, when printing, a browser might opt to leave out all background images and to adjust text colors to be sure the contrast is optimized for reading on white paper. This is the default.
exact
- The element's content has been specifically and carefully crafted to use colors, images, and styles in a thoughtful and/or important way, such that being altered by the browser might actually make things worse rather than better. The appearance of the content should not be changed except by the user's request. For example, a page might include a list of information with rows whose background colors alternate between white and a light grey. Removing the background color would decrease the legibility of the content.
Usage notes
There are a number of reasons a browser might wish to deviate from the specified appearance, such as:
- The content uses text and background colors that will be too similar on the output device for legibility purposes.
- If the output device is a printer, and to save ink, dark or extremely dense background images might be removed.
- When printing a page, the browser might want to replace light-colored text on a dark background with dark text on a white background.
Any options the user agent offers the user to allow them to control the use of color and images will take priority over the value of color-adjust
. In other words, there isn't any guarantee that color-adjust
will do anything. Not only can the user override the behavior, but each user agent is allowed to decide for itself how to handle color-adjust
in any given situation.
Formal definition
Initial value | economy |
---|---|
Applies to | all elements |
Inherited | yes |
Computed value | as specified |
Animation type | discrete |
Formal syntax
economy | exact
Examples
Preserving low contrast
In this example, a box is shown which uses a background-image
and a translucent linear-gradient()
function atop a black background color to have a dark blue gradient behind medium red text. For whatever reason, this is the desired appearance in any rendering environment, including on paper, so we also use color-adjust: exact
to tell the browser not to make color or style adjustments to the box when rendering it.
CSS
.my-box { background-color: black; background-image: linear-gradient(rgba(0, 0, 180, 0.5), rgba(70, 140, 220, 0.5)); color: #900; width: 15rem; height: 6rem; text-align: center; font: 24px "Helvetica", sans-serif; display: flex; align-items: center; justify-content: center; color-adjust: exact; }
HTML
<div class="my-box"> <p>Need more contrast!</p> </div>
Result
Specifications
Specification | Status | Comment |
---|---|---|
CSS Color Adjustment Module Level 1 The definition of 'color-adjust' in that specification. |
Editor's Draft | Initial definition. |
Browser compatibility
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
color-adjust | Chrome
Full support
49
| Edge
Full support
79
| Firefox Full support 48 | IE No support No | Opera
Full support
15
| Safari
Full support
6
| WebView Android
Full support
49
| Chrome Android
Full support
49
| Firefox Android Full support 48 | Opera Android
Full support
36
| Safari iOS
Full support
6
| Samsung Internet Android
Full support
5.0
|
Legend
- Full support
- Full support
- No support
- No support
- Uses a non-standard name.
- Uses a non-standard name.
See also
- Applying color to HTML elements using CSS
- Other color-related properties:
color
,background-color
,border-color
,outline-color
,text-decoration-color
,text-emphasis-color
,text-shadow
,caret-color
, andcolumn-rule-color
background-image