6 ms·He/she was asking if it performs well, not if it is supported.by mcrittenden 14y agoHe/she was asking if it performs well, not if it is supported.wwweston 14y agoOne could argue that where a feature is not supported, it's going to perform terribly, perhaps taking O(∞).qu4z-2 14y agoBut it won't lock up the user's browser in that time, which is helpful.