On Wed, Sep 11, 2013 at 11:24 AM, Ian Hickson <i...@hixie.ch> wrote: > On Wed, 11 Sep 2013, Robert O'Callahan wrote: > > > > Pinch-zoom is hard because we don't want to trigger reflows or other > > expensive behavior on pinch-zoom. I'd leave pinch-zoom out of it for > > now. > > Unless I'm missing something fundamental, changing the pixel density > doesn't cause a layout, it's changing the width that causes a layout.
It will do a layout if the width is directly or indirectly dependent on the CSS pixelratio. For instance, notice how the text boxes reflow if you change the page zoom: http://jsfiddle.net/BtAK7/1/