well a 'youtube' type site is dangerous because it is allowed to download to your pc and require media interface between your pc and the server. These are activities that are more privileged than webpages, and pop-ups can be spoofed for "do you want to install malware?' Y/N?
DNR
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He gives wisdom to the wise and knowledge to the discerning. He reveals deep and hidden things; he knows what lies in Darkness, and Light dwells with him.