It doesn't work in chrome. Try (test.png doesn't exist): <img width="100" height="100" style="width:100%;height:auto;" src=test.png> and you'll get 16x16px

It doesn't work in chrome. Try (test.png doesn't exist): <img width="100" height="100" style="width:100%;height:auto;" src=test.png> and you'll get 16x16px placeholder image. In Firefox, it works.