The "opacity" CSS Property

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New in CSS3

This property sets the opacity of an element as a whole, including its contents, rather than applying it to each descendant individually.

Values for "opacity"
CSS LevelValue
CSS 2.1(invalid)
CSS3a number between 0.0 and 1.0

Notes

  • 0 is fully transparent and 1 is fully opaque (solid). Any values outside the range 0.0 (fully transparent) to 1.0 (fully opaque) will be clamped to this range.

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