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[css-forms-1] Improve slider UA styles #12427

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Merged
lukewarlow merged 2 commits into from
Mar 16, 2026
Merged

[css-forms-1] Improve slider UA styles #12427

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8c4bb52
[css-forms-1] Add improved slider UA styles styles for switch
lukewarlow Jul 1, 2025
8bd9832
Give range a background-color
lukewarlow Mar 3, 2026
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49 changes: 44 additions & 5 deletions css-forms-1/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -837,36 +837,75 @@ select {

## Sliders ## {#stylesheet-sliders}

ISSUE: Refine meter, progress, switch and range input styling.
ISSUE(12267): Refine meter, progress, switch and range input styling.

```css
input[type="checkbox][switch],
input[type="range"] {
display: inline-flex;
position: relative;
align-items: center;
inline-size: 100%;
}

input[type="checkbox"][switch]::slider-track,
input[type="range"]::slider-track,
meter::slider-track,
progress::slider-track {
height: 1em;
block-size: 1em;
inline-size: 100%;
}

input[type=range]::slider-track {
block-size: 0.5em;
}

input[type=checkbox][switch]::slider-track {
border-radius: 1em;
}

input[type="checkbox"][switch]::slider-fill,
input[type="range"]::slider-fill,
meter::slider-fill,
progress::slider-fill {
height: 100%;
block-size: 100%;
background-color: currentColor;
}

progress:indeterminate::slider-fill {
inline-size: 0;
}

input[type="range"]::slider-fill,
input[type=checkbox][switch]::slider-fill {
background-color: color-mix(currentColor 25%, transparent);
border-radius: inherit;
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@lukewarlow lukewarlow Jul 1, 2025

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Not really sure if this should be needed, for my range input prototype it isn't but for switch it seems to be else the fill overflows the track.

We can adjust accordingly in future if it's not needed.


block-size: 100%;
}

input[type=checkbox][switch]::slider-fill {
inline-size: 0%;
}

input[type="checkbox"][switch]:checked::slider-fill {
inline-size: 100%;
}

input[type="checkbox"][switch]::slider-thumb,
input[type="range"]::slider-thumb {
border-radius: 0;
border: none;
background-color: currentColor;
appearance: none;
width: 1em;
height: 100%;
inline-size: 1em;
block-size: 1em;
border-radius: 100%;
position: absolute;
}

input[type=checkbox][switch]:checked::slider-thumb {
inset-inline-end: 0;
}
```

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