Write tests for web UI

[Charles-Johnson]

The following cases should automatically tested to prevent regressions

• After page has loaded, keyboard input is displayed in the textarea element without having to click the element

• When the textarea element is focused and the enter key is pressed, the text in the textarea is moved above the textarea element and the textarea element remains focused.

• The height of the textarea element does not change when typing text unless a newline of text is created