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opacity() - CSS | MDN
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opacity()
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2016.
The opacity() CSS function applies transparency to the samples in the input image. Its result is a <filter-function>.
Try it
filter: opacity(1);
filter: opacity(80%);
filter: opacity(50%);
filter: opacity(0.2);
filter: opacity(0);
<section id="default-example">
<img
class="transition-all"
id="example-element"
src="/shared-assets/images/examples/firefox-logo.svg"
width="200" />
</section>
Note:
This function is similar to the more established opacity property. The difference is that with filters, some browsers provide hardware acceleration for better performance.
Syntax
css
opacity(amount)
Parameters
amountOptional-
The amount of the conversion, specified as a
<number>or a<percentage>. A value of0%is completely transparent, while a value of100%leaves the input unchanged. Values between0%and100%are linear multipliers on the effect. The initial value for interpolation is1. The default value is1.
Formal syntax
<opacity()> =
opacity( [ <number> | <percentage> ]? )
Examples
Examples of correct values for opacity()
css
opacity(0%) /* Completely transparent */
opacity(50%) /* 50% transparent */
opacity() /* No effect */
opacity(1)
Specifications
| Specification |
|---|
| Filter Effects Module Level 1 # funcdef-filter-opacity |
Browser compatibility
Loading…
See also
- The other
<filter-function>functions available to be used in values of thefilterandbackdrop-filterproperties include: - The CSS
opacityproperty