Datalist
Datalist are defined in the same way as combos are although their function is completely different. While a tag is used to show a list of values in the web page.
d
Details
With this tag, we can add information which will be considered additional to the existing one and which will be able to be hidden or to be only visible when a user requests it. It as an open attribute, so if it is present, the information enclosed in this tag will be visible. This element is only correctly visible by using Google Chrome, since any other browser interprets it as normal text.
Dfn
It belongs to the group of elements that allow for text highlighting. All the contents included in this tag will be considered as one word’s definition. This is useful when creating a dictionary or a terms glossary.