No validation on the height/width fields (e.g. a value of 0 shows nothing, and the widget is broken):
- Add a Video fragment to a page.
- Edit its properties, setting both the height and the width to 0.
Also, setting very large values for width and height (e.g. 99999999) breaks the page – the video is displayed outside the fragment at regular size (ignoring the set values), sometimes the fragment disappears.