alpha and colorspace attributes for <input type=color>Limited availability
The ability to control the opacity of a color picked using <input type="color"> and determine the colorspace of the selected color.
Not yet supported in all major browsers — check the table and provide a fallback.
Browser support
DesktopChrome
✕Not supportedup to 155
Current: 155Edge
✕Not supportedup to 154
Current: 154Firefox
✕Not supportedup to 157
Current: 157Safari
1–18.3Not supported
18.4+Supportedsince Mar 31, 2025
Current: 27MobileChrome Android
✕Not supportedup to 155
Current: 155Firefox Android
✕Not supportedup to 157
Current: 157Safari iOS
1–18.3Not supported
18.4+Supportedsince Mar 31, 2025
Current: 27How to use
Not supported in Chrome, Edge, Firefox, Chrome Android, Firefox Android. Use feature detection below and provide a fallback (or a polyfill) for those browsers.
Example
Full syntax and examples are on MDN: alpha.
Feature detection
JS · check before using
if ("HTMLInputElement" in globalThis && "alpha" in HTMLInputElement.prototype) {
// HTMLInputElement.alpha is available
}Documentation (MDN)
Specification
Sub-features
Support for each part of the feature (4). The overall table above shows when the whole feature works.
| Sub-feature | Chrome | Edge | Firefox | Safari | Chrome Android | Firefox Android | Safari iOS |
|---|---|---|---|---|---|---|---|
| HTMLInputElement.alpha | ✕ | ✕ | ✕ | 18.4 | ✕ | ✕ | 18.4 |
| HTMLInputElement.colorSpace | ✕ | ✕ | 149 | 18.4 | ✕ | 149 | 18.4 |
| input.alpha | ✕ | ✕ | ✕ | 18.4 | ✕ | ✕ | 18.4 |
| input.colorspace | ✕ | ✕ | ✕ | 18.4 | ✕ | ✕ | 18.4 |