- From: Christoph Päper <christoph.paeper@crissov.de>
- Date: Thu, 26 Jan 2012 10:16:40 +0100
- To: www-style list <www-style@w3.org>
Tab Atkins Jr.: > Your third example - rgb(255, 0, 64, 127) - will always be invalid, > though - CSS can't distinguish between <integer> and <number> in > general, so the fact that alpha already takes a number in [0,1] means > we can't also have it take an integer in [0,255], <alpha> can only and must be used – unless we allow <percentage> as an alternative – when the function name ends in an ‘a’, otherwise the transparency value is given as either <percentage> (always for HSL) or <integer>, iff red, green and blue are also provided as integers in the range [0,255]. We had previously in implementations · rgb(<integer|percentage>, <integer|percentage>, <integer|percentage>) We had already · rgb(<integer>, <integer>, <integer>) · rgb(<percentage>, <percentage>, <percentage>) · #RGB · #RRGGBB We have now additionally · rgba(<integer>, <integer>, <integer>, <alpha>) · rgba(<percentage>, <percentage>, <percentage>, <alpha>) · hsl(<angle>, <percentage>, <percentage>) · hsla(<angle>, <percentage>, <percentage>, <alpha>) We should have + rgb(<integer>, <integer>, <integer>, <integer>) ! + rgb(<percentage>, <percentage>, <percentage>, <percentage>) + hsl(<angle>, <percentage>, <percentage>, <percentage>) + gray(<percentage>) + gray(<percentage>, <percentage>) + gray(<percentage>, <alpha>) + #RGBA + #RRGGBBAA We may have + rgba(<integer>, <integer>, <integer>, <percentage>) + rgba(<percentage>, <percentage>, <percentage>, <percentage>) + hsla(<angle>, <percentage>, <percentage>, <percentage>) + gray(<integer>) + gray(<integer>, <integer>) or gray(<integer>, <alpha>) + gray(<integer>, <percentage>) We should not have – rgb(<integer>, <integer>, <integer>, <percentage>) – rgb(<percentage>, <percentage>, <percentage>, <alpha>) – hsl(<angle>, <percentage>, <percentage>, <alpha>) – #W – #WA nor #WW – #RGBAA – #RRGGBBA We cannot have, assuming ‘should haves’ above – rgb(<integer>, <integer>, <integer>, <alpha>) ! – #WWAA We cannot have – rgba(<percentage>, <percentage>, <percentage>, <integer>) – rgba(<integer>, <integer>, <integer>, <integer>) – hsla(<angle>, <percentage>, <percentage>, <integer>) – #WAA – #WWA We must not have, or cannot have if ‘should not haves’ existed – rgb(<percentage>, <percentage>, <percentage>, <integer>) – hsl(<angle>, <percentage>, <percentage>, <integer>)
Received on Thursday, 26 January 2012 09:17:18 UTC