Opera 10.52 doesn’t support custom cursors at all. Internet Explorer scales all cursors to 32x32. Firefox 3.6 shows 16x16 and 32x32 custom cursors at their native size and ignores other-sized cursors. Safari 4.05 shows 16x16, 20x20, 20x40, 32x32, and 64x64 custom cursors at their native size and ignores other-sized cursors. Firefox 3.7 and Chrome 4.1 show 16x16, 20x20, 20x40, 32x32, 64x64 and 128x128 custom cursors at their native size and ignore 256x256 cursors.