Minifier outputs invalid Hex codes for rgba and transparent values

[onedrawingperday]

This issue came up in the Hugo Forum a few days ago and today I also came across this behavior myself:

It seems that for any rgba value e.g. rgba(000, 000, 000, 0.7); and also if a color value is set to transparent @tdewolff 's minifier outputs invalid hexadecimal numbers that fail W3C validation.

ref: https://discourse.gohugo.io/t/bug-minify-outputs-invalid-hex-codes-for-rgba-and-transparent-values/15609

I am opening this issue because this is something that looks like a proper bug but please note that currently my time is very limited and I cannot investigate further myself.

[onedrawingperday]

I am closing this issue after noticing the KeepCSS2 flag that fixes this behavior.

[tdewolff]

Yes, this is actually from new specifications from https://drafts.csswg.org/css-color-4/#hex-notation
Looking at https://developer.mozilla.org/en-US/docs/Web/CSS/color_value#Browser_compatibility it seems that Edge does not support this yet, so maybe I was too quick in adding it...thanks for the report!