Can Hexadecimal Notation Represent Partially Transparent Colors in CSS?

CSS Hexadecimal RGBA

Query:

Is there a concise way to represent partially transparent colors in hexadecimal?

Answer:

Yes, the CSS Color Module Level 4 (currently in the editor's draft stage) proposes support for both 4 and 8-digit hexadecimal RGBA notation:

4-Digit Hexadecimal Notation

• The first digit represents the red channel (0-f).
• The subsequent three digits represent the green, blue, and alpha channels, respectively.

Example:

background: #0000; /* Translucency omitted */

8-Digit Hexadecimal Notation

• The first six digits represent the RGB values (as with the existing 6-digit notation).
• The last two digits represent the alpha channel (00 = fully transparent, ff = fully opaque).

Example:

background: #00000000; /* Fully transparent */

Future Browsers:

While these notations are not yet supported in current browsers, they are likely to be introduced with the implementation of the Color Module Level 4 specification. Keep an eye on browser updates for compatibility.

Fallback for Non-Supporting Browsers:

In the meantime, you can use fallbacks to ensure support in all browsers:

figure {
  background: #FEFE7F; /* Fallback color */
  color: #3F3FFE;     /* Fallback color */
  
  background: rgba(255, 255, 0, 0.5);
  color: rgba(0, 0, 255, 0.75);
  
  background: #ffff007F; /* Modern browsers */
  color: #0000ffbe;     /* Modern browsers */
}

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