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The so-called RGBA colors (Red Green Blue Alpha) that add a new factor, the alpha channel, that is, the opacity or transparency that follows the same percentage scheme: 0% represents absolute transparency and 100% represents absolute opacity which is the way we traditionally see colors.
This is easily visible when we see some images in PNG format and it is not a free advance since we go from 24 bits to 32 bits, that is, heavier images.
The interesting thing is that the use of this alpha channel is not limited to images, it is also possible to apply it to some CSS properties although it is only available when the browser can interpret it since it is a possibility contemplated in CSS3, something that in this At the moment, only some browsers support.
The value, as in the opacity property, is expressed as a decimal percentage, going from 0 (total transparency) to 1 (the default value). In this example, different values were applied to the alpha channel to the green color:
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