Encrypted Media Extensions
Netflix supports HTML5 video using EME with a supported web browser: Chrome, Firefox, Microsoft Edge, Internet Explorer (on Windows 8.1 or newer), or Safari (on OS X Yosemite or newer). YouTube supports the HTML5 MSE. Available players supporting MPEG-DASH using the HTML5 MSE and EME are NexPlayer, THEOplayer by OpenTelly, the bitdash MPEG-DASH player, dash.js by DASH-IF or rx-player.
Internet Browser (Nintendo 3DS)
On the New 3DS, a new video player is integrated into the browser. It can play back both 2D and 3D Videos on webpages which supports HTML5. This eliminates the need for the dedicated YouTube app on the new 3DS.