(currently powered by Bing) outside of Japan, or Yahoo! Japan (currently powered by Google) in Japan, but can be configured to any supported search engine by editing the URL in the browser settings. The Nintendo DSi Browser limits search engine options to Google or Yahoo! Yahoo! Japan is no longer supported, as the browsers' security certificates have expired. Standards compliance The Nintendo DSi Browser passes the Acid1 test. It nearly passes the Acid2 test, except for fixed element positioning, resulting in two stray squares. It receives a 59% on the Acid3 test in Overview Mode and a 53% in Column Mode, although the page does not display properly in the latter. The Acid3 score was updated to 61% in April 2014. In comparison, the Internet Browser used by newer Nintendo systems is powered by NetFront NX and uses the WebKit browser engine. The newer browser also passes the Acid1 test, and while it fails Acid2, it scores better on Acid3: 92% on the original Nintendo 3DS, and 100% on the Wii U and New Nintendo 3DS. The browser has partial Unicode support, including nearly complete support of Western and CKJ sets, and several universal symbols. The browser font is used for all text and supports the text shadow style, but not bold or italic. Emoji is not natively supported, but can be displayed by using an emoji library, such as Twemoji. Memory Expansion Pak The Memory Expansion Pak, much like the Rumble Pak, is a DS Option Pak accessory for the Nintendo DS and DS Lite. It is inserted into Slot-2, and it adds 8 MB of RAM to the system, as well as a memory management unit, for a total of 12 MB. The accessory is available in two versions: one for the original Nintendo DS, and one that exclusively works with the DS Lite. (The original version is also compatible with the DS Lite, although the cartridge protrudes from the console.) Retailers carried both versions in Japan and Europe, but other regions only sold the DS Lite version at retail, while Nintendo made the original version available by mail order. The Nintendo DS Browser is the only licensed software for the console that used this accessory, although the browser's instruction manual suggested that other games and software could use the memory, whether mandatory or optional. Thus, the accessory behaves similarly to the Nintendo 64 Expansion Pak. Unofficial homebrew