Re: [geometry] DOMMatrix with DOMString argument

Was it Dirk Dingler?


On Mon, May 26, 2014 at 7:58 AM, Dirk Schulze <dschulze@adobe.com> wrote:

>
> On May 26, 2014, at 2:05 AM, Tab Atkins Jr. <jackalmage@gmail.com> wrote:
>
> > On Sun, May 25, 2014 at 12:10 AM, Dirk Schulze <dschulze@adobe.com>
> wrote:
> >> On May 23, 2014, at 11:32 PM, Tab Atkins Jr. <jackalmage@gmail.com>
> wrote:
> >>>> 2) If no Element was passed, what is the fallback for relative of
> percentage values?
> >>>
> >>> Generally speaking, these types of things are resolved against a 0
> >>> length.  I suppose that em/rem/etc should be resolved against the UA
> >>> default font and font-size.
> >>
> >> I checked MSCSSMatrix and WebKitCSSMatrix. Both have a method called
> setMatrixValue which takes a DOMString as argument. This DOMString takes a
> <transform-list> in the CSS Transforms notation. Percentage length values
> and relative length values throw a SyntaxError exception for both engines.
> It is at least another possibility. I am not sure if UAs can access font
> data without a document even though it should be possible.
> >
> > Yeah, only accepting absolute values is definitely a possibility.
> > There are potentially some relative lengths that might work - if
> > there's a reasonable way to associate the call with some default
> > viewport, it's possible that the viewport-relative units would work,
> > for example.  However, that probably wouldn't work in a Worker, for
> > instance.
> >
> > Thinking about it, it seems likely that any relative units that could
> > be resolved to an absolute length without at least a document for
> > context are probably actually just absolute lengths, and we'd refer to
> > them as such.  So, it's probably fine to declare that only absolute
> > lengths are allowed in the string arguments.
>
> I changed the spec to the described behavior of MSCSSMatrix and
> WebKitCSSMatrix. (Both seem to have the constructor taking a DOMString  as
> well with the same behavior as
> setMatrixValue.) I close the issue for now. Anyone can feel free to raise
> it again and we can explore the Element argument further.
>
> Greetings,
> Dirk
>
> >
> > ~TJ
>
>
>


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