[Web API type definition issue] HTMLInputElement.alpha, HTMLInputElement.colorspace

[sojs-coder]

Summary

Missing property definitions per https://html.spec.whatwg.org/multipage/input.html#color-state-(type=color)

Expected vs. Actual Behavior

HTMLInputElement.colospace and HTMLInputElement.alpha all result in TS errors.
lib.dom.generated.d.ts lacks these properties in the interface definitions.

Per WATWG HTML standard, these properties are valid, though accroding to https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/input/color#browser_compatibility, many browser have yet to implement this feature. This is a known bug on chromium (https://issues.chromium.org/issues/368059226) and should be resolved within the end of the year. Safari already supports these attributes, so they should be added to the spec.

Playground Link

No response

Browser Support

• This API is supported in at least two major browser engines (not two Chromium-based browsers).

Have Tried The Latest Releases

• This issue applies to the latest release of TypeScript.
• This issue applies to the latest release of @types/web.

Additional Context

3 browsers support it: all Apple/Safari (not Chromium). The majority of internet traffic passes through Safari on mobile, which is strong reasoning to add this to the specification, maybe with an experimental flag

[Bashamega]

Hello @sojs-coder,
Regarding the missing properties — this is intentional. Currently, only WebKit-based browsers support them. Once Blink adds support, they will be included.

In the meantime, you're free to patch this locally in your project if needed, although it's not recommended.

[sojs-coder]

Oh, @Bashamega. I figured once they were added to the spec they were added here. That is my bad.

[Bashamega]

It is added here once it is supported by more than one engine