When using Visual Studio 2012 (Ultimate), a red squiggly may appear indicating that
rgba(255, 255, 255, 0.4) is not a valid color property value
However, according to the W3C, it is considered a valid value. Could this be a bug in Visual Studio, or am I overlooking something?
This information holds true. Visual Studio may not provide comprehensive validation for HTML5/CSS3 functionalities.
Additional Resource on RGBa
This specific color property is considered valid according to the CSS3 standards;
rgba(255, 255, 255, 0.4)
The significance of the fourth parameter 0.4 in this context pertains to opacity, a distinctive feature of CSS3, with the a in rgba representing alpha
If you input the following code snippet into Visual Studio, you will notice that it does not generate an error message;
rgb(255, 255, 255);
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