it would be great if content element visibility tracking would be possible, without need to change the source code (like explained at How can I track interactions with popups and content? | Piwik PRO help center). Instead it would be great to be able to simply define CSS class or CSS ID names directly in tag manager interface. And when this CSS class or ID scrolls into visible area, this element is being tracked.
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Comment to add my support for this feature. 
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