[css-backgrounds] Specify exact pixel values for border-width: thin, medium, thick #7254
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I suspect the current undefinedness was one of those things where browsers didn't agree when we were nailing down 2.1 and we weren't sure they could agree by our deadline. |
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I think it was intentionally left UA-defined, just like the various font-size keywords. My suggestion would be to put “For Web compatibility, it is recommended that these keywords be mapped to 1px, 3px, and 5px, respectively.” or somesuch. |
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The CSS Working Group just discussed
The full IRC log of that discussion<emeyer> Topic: [css-backgrounds] Specify exact pixel values for border-width: thin, medium, thick<emeyer> Github: https://github.com//issues/7254 <emeyer> TabAtkins: Was noticed that we still leave the keyword thicknesses undefined. But all browsers agree on widths at 1px, 3px, 5px. <emeyer> …Not sure of the exact history, but absent that, the widths are very consistent and don’t see a good reason to leave them undefined. <astearns> ack fantasai <emeyer> fantasai: Maybe it was that these were like font-size keywords and left open to interpretation. We should maybe recommend but not require specific widths. <fantasai> My suggested wording was “For Web compatibility, it is recommended that these keywords be mapped to 1px, 3px, and 5px, respectively.” <emeyer> TabAtkins: On the other hand, we specify a lot of things that could be adjusted by e-readers. I don’t know that this needs to be left undefined. <emeyer> …I argue we should go stronger than suggested. <astearns> ack dbaron <emeyer> dbaron: This is one of those things that was left up in the air in CSS1, and I don’t remember a proposal to define more precisely. I support the precise definition. <emeyer> fantasai: If everyone else agrees, that’s fine. <emeyer> RESOLVED: thin, medium, and thick will be defined as 1px, 3px, and 5px respectively. |
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See this Twitter thread: https://twitter.com/tabatkins/status/1522261879762014223
Since browsers agree on 1px, 3px and 5px for border-width: thin, medium, and thick, respectively, it seems to me the spec could require this mapping for all UAs.
cc @tabatkins @bfgeek
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