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Which of the following is the Color Format that is the CSS3 HSL value with a fourth value to set the alpha channel value for the color to define the opacity of the element?

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Which of the following is the Color Format that is the CSS3 HSL value with a fourth value to set the alpha channel value for the color to define the opacity of the element?

(a) HSLa Color

(b) HSL Color

(c) RGBa Color

(d) RGB Color

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This intriguing question originated from Strings and Keywords topic in chapter CSS Properties, Elements, Functions & Tables of CSS

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The correct choice is (a) HSLa Color

The explanation: An HSLa is specified via a function style hsla(hue,saturation, lightness, alpha), where hue, saturation, and lightness are the same as standard hsl() values, and the alpha channel value for defining opacity is a number between 0 (fully transparent) and 1 (fully opaque).

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