自定义鼠标图标的支持情况

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.