Error when running sequence of animations without newline

[jcubic]

Issue summary

When you run sequence of echo animations without the newline, there are errors visible on the screen.

Expected behavior

Animation runs without errors

Actual behavior

There is red text visible between animations

Steps to reproduce

1. Open demo https://codepen.io/jcubic/pen/OJoZWqa?editors=0010
2. type animation

Browser and OS

N/A

Additional notes

• fix the issue
• write unit tests