We develop a webapp that targets the music industry, and none of them is using old IEs. We have been using flexbox in production for more than one year :) Howe

We develop a webapp that targets the music industry, and none of them is using old IEs. We have been using flexbox in production for more than one year :) However, this webapp is used to generate websites that may be visited by anybody, really, so we have to support IE9 and we don't use flex box for them. It all depends on your customers / visitors base.