opacity() - CSS: Cascading Style Sheets 编辑

The opacity() CSS function applies transparency to the samples in the input image. Its result is a <filter-function>.

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

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

opacity(amount)

Parameters

amount

The amount of the conversion, specified as a <number> or a <percentage>. A value of 0% is completely transparent, while a value of 100% leaves the input unchanged. Values between 0% and 100% are linear multipliers on the effect. The lacuna value for interpolation is 1.

Examples

Examples of correct values for opacity()

opacity(0%)   /* Completely transparent */
opacity(50%)  /* 50% transparent */
opacity(1)    /* No effect */

Specifications

Specification	Status
Filter Effects Module Level 1 The definition of 'opacity()' in that specification.	Working Draft

See also

• <filter-function>
• CSS opacity property
• blur()
• brightness()
• contrast()
• drop-shadow()
• grayscale()
• hue-rotate()
• invert()
• saturate()
• sepia()