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[JMAP] Re: draft-ietf-jmap-calendars-26: Calendar color

Robert Stepanek <rsto@fastmailteam.com> Tue, 31 March 2026 16:16 UTC

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Date: Tue, 31 Mar 2026 18:15:36 +0200
From: Robert Stepanek <rsto@fastmailteam.com>
To: jmap@ietf.org
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Subject: [JMAP] Re: draft-ietf-jmap-calendars-26: Calendar color
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On Tue, Mar 31, 2026, at 6:11 PM, Michael Douglass wrote:
> Why not just say it must be a valid color as defined by https://drafts.csswg.org/css-color-4/#color-syntax
> 

RFC 8984 already requires it to be hexadecimal. And we already see services setting them in iCalendar in 6-digit notation but not in any other form.

Apart from that, supporting alpha channels and the different numeric formats looks like overkill to me for calendaring purposes. We want to keep it simple for implementers.

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