This News Ticker has been adapted to sit within a box (as shown in blue) that has a height set to just contain news item #3 (the nominal longest item). In this case all news items that require a height that is the same (or smaller) than this height can be displayed without any jumping (see items # 1, 2, 3 and 4). If, however, an even longer news item is later added that exceeds this height (as demonstrated with news item #5) then jumping will occur when this item (only) is displayed. This approach is a non-perfect work-around that requires that the longest news item length be know in advance (so that an appropriate height can be pre-set by Spoton Technical Department). The pre-set height can, of course, be changed to a different value.. but this would have to be done in the style sheet by Spoton Technical Department. 
This is news ticker item #1. It fits on a single line by itself. End of item #1. 
This is news ticker item #2. It is longer and needs more than one line to display. Lorem ipsum dolor sit amet, vestibulum mattis egestas quam volutpat fames et. Pellentesque velit vestibulum. End of item #2. 
This is news ticker item#3. It is the longest item and covers many lines. The minimum height of the News Ticker box will have to be pre-set sufficiently large to match the height of this longest item. Lorem ipsum dolor sit amet, vestibulum mattis egestas quam volutpat fames et. Pellentesque velit vestibulum aliquam et tortor ut. Dolor risus imperdiet quo, felis morbi vestibulum arcu risus ante, placerat duis elit nulla amet erat convallis. Lorem quis a erat, ornare mi vitae sed eu, lorem adipiscing ligula mauris nisl, sed nulla risus porta. End of item #3. 
This is news ticker item #4. It fits a single line by itself. End of item #4. 
This is news ticker item #5. It is deliberately set to be longer than item #3 to demonstrate that jumping will occur if an long item is added that exceeds the minimum height that was pre-set based on the content of item #3. Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, vestibulum mattis egestas quam volutpat fames et. Pellentesque velit vestibulum aliquam et tortor ut. Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, vestibulum mattis egestas quam volutpat fames et. Pellentesque velit vestibulum aliquam et tortor ut.Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, vestibulum mattis egestas quam volutpat fames et. Pellentesque velit vestibulum aliquam et tortor ut. End of item #5.