In CSS, what is the name of the property that sets the opacity of an HTML element?

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Cascading Style Sheets is a style sheet language used for describing the presentation of a document written in a markup language such as HTML or XML. CSS is a fundamental technology of the World Wide Web, alongside HTML and JavaScript.
 

There are three types of CSS:
- Inline CSS
- Internal or Embedded CSS
- External CSS


In CSS, what is the name of the property that sets the opacity of an HTML element?