Create a Video player with DASH and MSE on any browser

Question

I am complete new in Adaptive streaming over HTTP . I have little bit experience in HTML and JavaScript . Initially I have read lot of documents for DASH and Adaptive streaming over HTTP . I have understood lot of new things . Now i want to create my custom video player for adaptive streaming in HTML 5 . I have gonethrough some of the following documents . My findings are

• Media Source Extensions (MSE) is a JavaScript API that lets you build streams for playback from segments of audio or video .
• We can use MSE related APIs in javascript for the implementation of adaptive streaming in HTML 5.
• Dash.js library an open-source MPEG-DASH player implemented entirely in JavaScript .

I have gone through

• https://msdn.microsoft.com/en-us/library/dn551368(v=vs.85).aspx
• https://developers.google.com/web/fundamentals/media/mse/basics
• https://blogs.msdn.microsoft.com/interoperability/2014/01/03/mpeg-dash-tutorial-embedding-an-adaptive-streaming-video-within-your-html5-application/

Now my aim is to create custom DASH client player with following features

• Create a Media player on any browser
• Parsing MPD file
• Decode audio/video data
• Segment parsing
• Add content to the video player

Now my understanding is Dash.js is doing all the above steps with JavaScript . Isn't ? Now My doubts are

1. Is Dash.js is creating media player with MSE API's ?
2. Can i adaptive stream over HTTP with out MSE ?
3. If not , How can i work this on old browsers ? (Non-MSE compliance browser)

Finally how can i write a custom video player for adaptive streaming with out any libraries ? Can you Please suggest Any useful links or tutorials ?