[whatwg] Responsive images and printing/zooming

Tab Atkins Jr. jackalmage at gmail.com
Wed May 16 09:23:36 PDT 2012

On Wed, May 16, 2012 at 6:15 AM, Markus Ernst <derernst at gmx.ch> wrote:
> I read the current spec and huge parts of today's discussions to find out
> how images with multiple sources are intended to behave when printed, or
> when the page is zoomed, but I found no hints. I think some words on this
> might be useful in the spec, regardless of what the final syntax will be.
> 1. Print
> When a page is printed (or also converted to PDF or whatever), both
> "viewport" width and pixel ratio change. Are UAs expected to load the
> appropriate sources then? This could result in increased bandwidth, delayed
> printing, and IMHO a disturbed user experience, as the image may differ from
> the one seen on screen. Thus, I suggest to always use the resource actually
> shown on screen for printing.
> 2. Zoom
> On mobile devices, web pages are often zoomed out to fit the viewport width
> by default, the user is supposed to manually zoom in and scroll in order to
> read parts of pages. I understand that the whole thing about responsive
> design is to make this kind of zooming unnecessary, but in practice there
> will be all kinds of partly responsive designs using responsive images.
> Specially in cases where separate sources are given to match device pixel
> densities, zooming might matter, as for a zoomed-out page the low res image
> might be more than sufficient, but after zooming in the higher resolution
> might be appropriate. Which OTOH can disturb the user experience, when the
> images differ.

I'm with Odin.  Both of these seem like simple
quality-of-implementation issues.  We shouldn't overly restrict
browsers right now, so we can see what works best in the wild.  If
necessary, we can come back through later and tighten the


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