Changing spans of text with Javascript

As said in a previous post i would check some more how different textfields act when changing the color/style of it with Javascript.

As you see here:
https://360.articulate.com/review/content/b6698e2b-498e-471a-b48a-6baaa830bffc/review
When formatting the text, each useraction...setting it bold, italic or whatever makes a different <span> around the html. That you can use if wanted to target a specific part of the text as you can see here.