Full-Screen Video Background 
Autor: Bjorn Andreassen
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Is this possible in WebSite X5?
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Yes, you could use row formats and include every row.
If you don't want header and footer create page without template.
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What is the max video size (MB) for background?
To the best of my knowledge there is no size limit and anything should be fine given high speed internet. However many tablets and mobile's use less than optimum 3g connections and do not have the same processing power. You will need to weigh acceptable quality against size.