Re: [csswg-drafts] [css-values][css-images] Allow trailing comma in gradient functions (and probably others) (#4968)

• From: Oriol Brufau via GitHub <sysbot+gh@w3.org>
• Date: Tue, 21 Apr 2020 21:32:54 +0000
• To: public-css-archive@w3.org
• Message-ID: <issue_comment.created-617425824-1587504773-sysbot+gh@w3.org>

> If we make this change, could we extend it to all comma-separated lists

Maybe for all functions, but the `,;` looks a bit odd for me in 

```css
background-image: url("image.png"),;
```

Though maybe some people would like this style in order to avoid touching the previous line when inserting some item at the end:

```css
background-image:
  url("image1.png"),
  url("image2.png"),
;
```

Anyways, doing this for all [`#`](https://drafts.csswg.org/css-values/#mult-comma) can have some strange implications for more general syntaxes.

For example, the syntax of [`background`](https://drafts.csswg.org/css-backgrounds/#background) is `<bg-layer># , <final-bg-layer>`. So if we just allow a trailing comma after `<bg-layer>#`, then this would still be invalid:

```css
background:
  url("image.png"),
  yellow,
;
```

but this would be valid:


```css
background: url("image.png"),, yellow;
```

So instead of tying this to `#` lists, maybe the rule should be that `)` and `;` can be preceded by an optional comma or something like that.

-- 
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Received on Tuesday, 21 April 2020 21:32:56 UTC