Internet Browser

The 3DS Internet Browser was added in the June 2011 Update for JP/EUR/USA.

From the Internet Browser help section: In compliance with the LGPL, the source code of the OSS is available via the Nintendo website. This source code can be downloaded here: [1]

The 3D Internet Browser is Netfront Browser NX v1.0 based on WebKit engine.

User-agent is : Mozilla/5.0 (Nintendo 3DS; U; ; fr) Version/1.7412.EU for a EUR/fr Nintendo 3DS

Web Standards

HTML 4.01
HTML 5 (101/400 score on HTML5Test.com)
XHTML 1.1
CSS 1
CSS 2.1
CSS 3 (some functionality is unavailable)
DOM Levels 1-3
ECMAScript
XMLHttpRequest
Canvas Element (some functionality is unavailable)

Protocols

HTTP 1.0
HTTP 1.1
SSLv3
TLS 1.0

Image Formats

MPO
GIF
JPEG
PNG
BMP
ICO (some files cannot be displayed)

Plug-Ins

Plug-ins (such as Adobe Flash) are not supported.

Other details

It scored 90/100 on Acid3 test
Images from the Internet can be saved to the SD Card and viewed using the Nintendo 3DS Camera application.
Images saved to an SD Card or to the Nintendo 3DS system memory can be uploaded to blogs or other sites that allow the uploading of photos using :

<input type="file" />

HTML5Test.com say that Drag and drop is supported but it's not (code on WebKit is ready, but it's not implemented on interface of browser)

Tips

Detect User Agent

To detect if the user agent is Nintendo 3DS Browser :

<script type="text/javascript">
     window.onload=function() 
     {
         if (navigator.userAgent.indexOf('Nintendo 3DS') == -1) //If the UserAgent is not "Nintendo 3DS"
         {
               location.replace('http://www.3dbrew.org'); //Redirect to an other page
         }
     }
</script>