[css-backgrounds] <color> in <shadow> should default to currentcolor

[upsuper]

Currently the spec says:

Specifies the color of the shadow. If the color is absent, the used color is taken from the color property.

It seems to behave like currentcolor nowadays, but it would have different behavior in terms of interpolating. I think we should probably make it default to currentcolor instead. I see no reason we need a separate no-color value case.

(It's not clear to me whether it should go to level 3 or 4.)

[svgeesus]

(It's not clear to me whether it should go to level 3 or 4.)

When we get agreement on this, it would be a change to color 4 and an erratum on color 3.

[upsuper]

Let's put it into agenda... but next telecon is not apac timezone one which can be hard for me to take part in so maybe sydney f2f...

[upsuper]

This also affects drop-shadow() in Filter Effects, which has similar statement:

the missing used color is taken from the color property.

It should use currentcolor as well, I suppose.

[svgeesus]

I agree that referencing currentColor is the correct way to go here for both shadow and drop-shadow().

[css-meeting-bot]

The Working Group just discussed <color> in <shadow> should default to currentColor, and agreed to the following:

• RESOLVED: Accept the proposal
• RESOLVED: drop-shadow and shadow will also default to currentColor

The full IRC log of that discussion

<myles> Topic: <color> in <shadow> should default to currentColor
<myles> Github: https://github.com//issues/2766
<myles> Fantasai: any objections?
<chris> rrsagent, here
<RRSAgent> See https://www.w3.org/2018/07/03-css-irc#T23-20-25
<myles> Rossen: We need to make sure the people who care have a chance to look
<myles> xidorn: the issue is that if it isn’t specify, the used color is taken from the current property
<myles> xidorn: I think the text should just be “it defaults to currentColor”
<myles> dbaron: the spec may have evolved from something that was more flexible
<myles> chris: let’s say it’s user defined
<myles> Rossen: are we okay with the proposed resolution?
<myles> Rossen: any objections? <silence> resolved
<chris> s/let/(sarcastically) let/
<myles> RESOLVED: Accept the proposal
<Rossen> s/Accept the proposal/<color> in <shadow> should default to currentcolor
<myles> chris: There’s also the same problem with drop-shadow as well as shadow
<myles> leaverou: it doesn’t work that way already?
<myles> Rossen: any additional comments?
<myles> Rossen: <silence> Any objections?
<myles> RESOLVED: drop-shadow and shadow will also default to currentColor