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Showing content from http://developer.mozilla.org/en-US/docs/Web/CSS/filter-function/opacity below:

opacity() - CSS | MDN

Baseline Widely available

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

<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.

amount Optional

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 initial value for interpolation is 1. The default value is 1.

<opacity()> = 
  opacity( [ <number> | <percentage> ]? )  

opacity(0%)   /* Completely transparent */
opacity(50%)  /* 50% transparent */

opacity()     /* No effect */
opacity(1)

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