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1) Because you can insert tgs in opf, ncx and xml files, but not in css files
2) insert tag allows you to insert any tag you like, as mrmikel pointed out
3) Insert tag is primarily useful for full tags and to wrap existing text in a tag. Self closing tags are pretty easy to just type.
4) I dont see much point, see (2) you can have any tag ata ll , including invalid ones.
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