I would like to trigger a text field OnChange behaviour of a slide. I need a little help on this. I do not want the text being included at the slide itself but shown on the right side of it.

Hello Greta,
Could you please be a little more detailed explaining what you need to achieve?

Yes, sure.
Html5 slideshow has a great built-in description part which I can place on top or bottom of the slide. Problem is, that it covers the slide pretty much if this description-text is long. So I would like to display this description-text on the right side, outside the slide in its own <div> section.

Unfortunately this is not possible.
The design of the slideshow requires the description to be placed inside the slide.