[Whatwg] [whatwg] Color attributes
zcorpan at gmail.com
Fri Jul 27 04:07:26 PDT 2007
On Thu, 05 Jul 2007 23:43:55 +0200, Simon Pieters <zcorpan at gmail.com>
> Color attributes in HTML have special processing.
> Some tests/demos:
> https://bugzilla.mozilla.org/attachment.cgi?id=188040 contains further
> tests and an algorithm that is supposed to match what IE does. The only
> flaw in that algorithm AFAICT is that there is a step missing before the
> first step: match the value against the list of supported color keywords.
> For reference, the complete algorithm would be:
> 1. If the value case-insensitively matches a color keyword, use that
> abort these steps. [CSS3COLOR]
"transparent" is also to be treated as a keyword, meaning transparent. (It
seems that IE treats transparent as black for text color, but that's a CSS
> 2. Trim all but the first 128 chars from the string.
> 3. If it exists, strip the first leading #.
> 4. Replace non-valid-hex chars with 0s.
> 5. Lower-case the string.
> 6. Make string length a multiple of 3 and a minimum of 3 by
> appending 0s.
> 7. Split the string into 3 equal segments.
> 8. Trim all but the right-most 8 chars from each segment.
> 9. If segment length is 1, left-pad each segment with a 0, else:
> 10. While segment length is greater than 2 and the first char of each
> segment is equal to 0, trim the left-most char from each segment,
> 11. Trim all but the first 2 chars from each segment.
> 12. Join the segments and append them to a # char to create the final
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