CSS HTML Validator - The fast, all-in-one, HTML, CSS, Link, SEO, spelling, and accessibility checker for Windows, & htmlval for Mac and Linux
Home Help: "opacity" CSS property

The "opacity" CSS Property

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 Color Level 4"<alpha-value>", where <alpha-value> = "<number> | <percentage>"


  • 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.

Recommended Links

Search Engine Links (for more information)

Help us improve this page: Suggest a link or noteReport a problem