Bug 56461 – Add #RRGGBBAA and #RGBA as options for color hex values in CSS

• Status: RESOLVED
• Resolution: DUPLICATE
• Component: CSS

[Paul Neave]

Currently the only way to specify a color with an alpha value is to use the rgba() syntax, such as:

.my-color {
    color: rgba(255, 255, 255, 0.5); /* half white */
}

This can become very unwieldy to write. A more succinct syntax could extend the current format of #rgb or #rrggbb to include #rgba or #rrggbbaa like so:

.my-color {
    color: #ffffff80; /* half white */
}

The browser could easily detect the difference between a 3 or 4 character hex value, or a 6 or 8 character hex value, and implement the alpha channel as appropriate.

[Mike Lawther]

This is not in the spec.

Perhaps ask www-style@ for their opinion.

[Andras Becsi]

*** This bug has been marked as a duplicate of bug 39140 ***