I ran into an issue recently with a Web Direct page being viewed in a browser. It's a layout that has some small thumbnails on each body element, in a list view. The images are 58(w) x 87(h).
This layout, when viewed in FileMaker, displays nice crisp thumbnails. But when the same layout is viewed in a browser (Safari, Chrome, or Firefox) those same thumbnails are a bit blurry. (All browsers showed the same blurriness.)
These thumbnails are themselves generated from images that are much larger - we scale them down after a user adds the image to keep the size of the DB smaller. (These images are only ever displayed in a small thumbnail size.)
This is served up using FMS 15.01; viewed with FMPA 15.03, and the 3 browsers mentioned.