html element , html snippets , JS snippets

hello ,    can any one help me to figure out what is the different between html element , html snippets and JS snippets. Also, if i want to use html within widgets , how i can do this ?    I mean if i want to create flipped card but to fill it with data from my database how i can do this. I search about how to use html snippet and html element from documents but the explanation not clear about the usage .  
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