Tried that (along with display: -ms-grid;) but no joy. I think there’s a separate issue with the fact that SVGs in IE11 have all sorts of scaling issues when they don’t have widths and heights (defaulting to unpredictable and unwanted values — 150px seems to always come up) but I couldn’t identify the right values (100%? auto?) or the right place (on the SVG? on the container?) to help it along. Thanks, though, for a neat solution that works (almost) everywhere.