Problem adding html to blocks I seem to have a problem when adding html to a block (i'm using ckk editor), if i toggle Source it loses them html id tag. If I save the Block without toggling, it works fine, but when I go back in to edit the block afterwards, it has lost the div id tag. I have attached a pic which shows the problem in 3 steps. I have it set to Full HTML throughout.
I thinks, you must twig ckeditor config file, and set config.allowedContent = true. Please, see docs http://docs.ckeditor.com/#!/guide/dev_allowed_content_rules

This links below can help you.

https://stackoverflow.com/questions/15659390/ckeditor-automatically-strips-classes-from-div

CKEDitor removes class names, even with the exception in config