[css-color-adjust-1] Why special-casing background-image for inputs?

[emilio]

https://drafts.csswg.org/css-color-adjust-1/#forced-colors-properties has a somewhat odd condition:

Additionally, on on user input controls (except button-like controls) only, background-image.

Two questions:

• Why special-casing input / textareas? I've never seen a textarea styled with background-image so I'm actually surprised that this special-casing is necessary.

• If it is necessary, that sentence seems a bit ill-defined. Is <input type=color> a button-like control? What about <select>?

cc @atanassov

[alisonmaher]

@emilio I believe this was a remnant of Legacy Microsoft Edge behavior. I agree that this shouldn't be necessary, especially with the backplate feature, and I would support removing this from the spec.

[fantasai]

Why special-casing input / textareas?

We inherited this from Microsoft's definition, so that's a question for @atanassov and @melanierichards :)

If it is necessary, that sentence seems a bit ill-defined. Is <input type=color> a button-like control? What about <select>?

It's ill-defined because appropriate behavior can vary by platform. CSS/HTML doesn't define what controls "look like" buttons, but that's intended the criteria here...

[atanassov]

We actually don't need this behavior given that the backplate is now covering all of these scenarios. I recommend removing the text from the spec and closing this issue.

[css-meeting-bot]

The CSS Working Group just discussed Why special-casing background-image for inputs?, and agreed to the following:

• RESOLVED: Remove the special case of background images on input elements wrt forced colors

The full IRC log of that discussion

<heycam> Topic: Why special-casing background-image for inputs?
<heycam> github: https://github.com//issues/4917
<heycam> Rossen_: this issue is calling out some special casing that was added for bg images on input elements
<heycam> ... for the purposes of forced colors
<heycam> ... and this was a legacy behavior that was carried forward over the years and not really necessary any more
<heycam> ... since we have the backplate, which is used to guarantee contrast where needed
<heycam> ... just commented earlier on the issue earlier, I'm completely fine with removing it from the spec and closing the issue
<heycam> ... unless anyone has any reason why we shouldn't
<heycam> ... any objections to removing the special casing and closing the issue?
<heycam> RESOLVED: Remove the special case of background images on input elements wrt forced colors
<TabAtkins> i'm fine with moving to inline issues
<fantasai> https://github.com//issues/3199#issuecomment-634368358

[alisonmaher]

Resolved by the WG and PR landed. Closing.