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[css-forms] Add select list box styles #12908

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merged 1 commit into from
Oct 7, 2025
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[css-forms] Add select list box styles #12908

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55 changes: 40 additions & 15 deletions css-forms-1/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -867,14 +867,12 @@ input[type=radio]:checked::checkmark {
width: 100%;
}
```
## Selects & buttons ## {#stylesheet-select-button}

```css
select {
/* Base appearance select always sizes based on its contents. */
field-sizing: content !important;
}
## Buttons (and button-like controls) ## {#stylesheet-button}

Selects are only button-like when they're a [drop-down box](https://html.spec.whatwg.org/multipage/rendering.html#drop-down-box).

```css
button,
::file-selector-button,
select,
Expand Down Expand Up @@ -925,17 +923,11 @@ input:is([type="color"], [type="button"], [type="reset"], [type="submit"]) {
:disabled::file-selector-button {
color: color-mix(in srgb, currentColor 50%, transparent);
}
```

select > button:first-child {
/* Prevents button from setting font, color, or background-color */
all: unset;

/* Prevents duplicate box decorations */
display: contents;
## Selects ## {#stylesheet-select}

/* Prevents button activation behavior so select can handle events */
interactivity: inert !important;
}
```css
select option {
/* These min-size rules ensure accessibility by following WCAG rules:
* https://www.w3.org/WAI/WCAG22/Understanding/target-size-minimum.html
Expand Down Expand Up @@ -992,6 +984,27 @@ select option {
/* this creates a full bleed hover highlight */
padding-inline: 0.5em;
}
```

### Drop-down box selects ### {#stylesheet-dropdown-select}

These styles should apply when the select is a [drop-down box](https://html.spec.whatwg.org/multipage/rendering.html#drop-down-box).

```css
select {
field-sizing: content !important;
}

select > button:first-child {
/* Prevents button from setting font, color, or background-color */
all: unset;

/* Prevents duplicate box decorations */
display: contents;

/* Prevents button activation behavior so select can handle events */
interactivity: inert !important;
}

select::picker-icon {
/* margin-inline-start pushes the icon to the right of the box */
Expand Down Expand Up @@ -1034,6 +1047,18 @@ select::picker-icon {
}
```

### List box selects ### {#stylesheet-listbox-select}

These styles should apply when the select is a [list box](https://html.spec.whatwg.org/multipage/rendering.html#list-box).

```css
select {
overflow: auto;
display: inline-block;
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overflow has a tab character but display has two spaces

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Oops. I'll fix that in a follow-up at some point.

block-size: calc(max(24px, 1lh) * attr(size type(<integer>), 4));
}
```

<h2 class=no-num id=changes>Changes</h2>

<h3 class=no-num id=changes-20250325>Since the
Expand Down