Convert CSS Color Value to RGB Code Inspection in PhpStorm

"Convert CSS Color Value to RGB"
Code inspection for CSS styles in Web Development Integrated Development Environment (IDE) PhpStorm may show this warning and indicates that you convert hexadecimal color codes to RGB codes. It's a surprising warning and I decided to research this warning rather than accept it just like that.

As you may have guessed, there is nothing inherently wrong in either of the formats, as detailed in the CSS specifications for color values at World Wide Web Consortium (W3C):

em { color: #f00 } /* #rgb */
em { color: #ff0000 } /* #rrggbb */
em { color: rgb(255,0,0) }
em { color: rgb(100%, 0%, 0%) }

This inspection and its inverse is included in PhpStorm to help maintain consistency in code, as clarified in support forum as follows:
"This inspection is optional, there is NOTHING wrong with any of the color representation formats. It is there just to help you to use SINGLE style (be it HEX or RGB -- hence 2 OPPOSITE inspections). Just find that inspection in "Settings | Inspections" and read the description.", Andriy Bazanov