Re: [css3-images] Reconsider 'auto' value for object-fit

On Wed, Jan 26, 2011 at 9:52 PM, Simon Pieters <simonp@opera.com> wrote:
> Hi
>
> I'd like the WG to reconsider the 'auto' value that we suggested as the
> initial value for object-fit back when we implemented object-fit. It's
> needed to retain backwards compatibility with traditional behavior of
> bitmaps and SVG in <img> and <object> as well as inline <svg>. I'm
> particularly interested in whether WebKit and Gecko would like to keep the
> status quo behavior for bitmaps and SVG in <img> and <object> (and <svg>) by
> using 'auto' or would rather like to change from the traditional behavior
> and make 'fill' the default, as the spec says (and probably breaking Web
> content that expects the traditional behavior, as well as changing from what
> the SVG spec requires for SVG, IIRC).

As stated by smfr, video doesn't need special-casing here, because the
UA stylesheet can simply supply a different object-fit value for
<video> via selectors.

<img> similarly works consistently.  The size of the drawing area is
always 'fill' by default.  SVG is then allowed to draw into that area
however it wants, including respecting the @preserveAspectRatio
attribute.  (Bitmaps just always scale themselves to the drawing
area.)

I forget exactly what the behavior of <object> is, but it should act
similarly, where it always figures out its drawing area in the same
way, and the content then decides how to fill the drawing area.

~TJ