[whatwg] Quirks Mode Standard

[Aryeh Gregor]

On Fri, Feb 10, 2012 at 10:37 AM, Boris Zbarsky <bzbarsky at mit.edu> wrote:
> I agree that having the list for lengths reduces the scope of the problem
> somewhat.  But the color quirk means that any shorthand that includes colors
> will run into ambiguity issues if any keywords for any subproperty only use
> letters in the range a-f.  I _think_ we can't hit that case now, but going
> forward that will either place a restriction on keyword values or we'll need
> to define how to resolve the ambiguity somehow.
>
> Even for lengths, if we ever add any new subproperties to border, say, that
> happen to take numbers we would run into trouble.  I'd rather not
> overconstrain future development of CSS by how we define quirks behavior.

Why not just say that these quirks only apply to existing syntaxes,
not new ones?  I was quite surprised to find that unitless numbers
worked for 'transform-origin' in quirks mode.