- From: Alex Geller <alexgeller@web.de>
- Date: Tue, 21 Jan 2003 11:35:04 -0500 (EST)
- To: www-validator-css@w3.org
Hi,
consider the following two rules:
A { margin-top:12pt+2pt }
B { margin-top:12pt-2pt }
While the first rule is accepted, the second is rejected saying "Unknown dimension : 12pt-2pt".
Is 12pt+2pt a known dimension then?
The reason for this behaviour is the grammar. Here the relevant part:
expr
: term [ operator term ]*
;
term
: unary_operator?
[ NUMBER S* | PERCENTAGE S* | LENGTH S* | EMS S* | EXS S* | ANGLE S* |
TIME S* | FREQ S* | function ]
| STRING S* | IDENT S* | URI S* | RGB S* | UNICODERANGE S* | hexcolor
;
operator
: '/' S* | ',' S* | /* empty */
;
{num}{ident} {return DIMEN;}
The first expression is resolved as:
expr
term
LENGTH 12pt
term
unary_operator +
LENGTH 2pt
While the second yields:
expr
term
DIMEN 12pt-2pt
hence the strange behaviour.
BTW the validators pretty printer does not output the additional terms. The rule:
C { margin-top:-10%/12pt,12pt+12pt 12pt }
is accepted as beeing valid but the output is stripped to:
C {
margin-top : -10%;
}
______________________________________________________________________________
Keinen passenden Spruch für die SMS parat? Mit WEB.DE FreeMail
kein Problem mehr! http://freemail.web.de/features?mc=021149
Received on Tuesday, 21 January 2003 15:56:35 UTC