
doc:   [
    DocGroup({"tag": "bullet"}, [
        DocGroup({"tag": "h3"}, [
            DocChars("k  MD"), DocGroup({"tag": "caret", "client": "a"}, []),
            DocChars("Y")
        ]),
        DocGroup({"tag": "h3"}, [
            DocGroup({"tag": "caret", "client": "b"}, []),
            DocChars("r  N")
        ]),
        DocGroup({"tag": "h3"}, [
            DocChars(" U3 b0 worl4 H31hat\'s up with you?")
        ])
    ])
]

a_del: [
    DelWithGroup([
        DelGroup([
            DelChars(5), DelGroup([]),
            DelChars(1)
        ])
    ])
]
a_add: [
    AddWithGroup([
        AddGroup({"tag": "pre"}, [
            AddGroup({"client": "a", "tag": "caret"}, []),
            AddChars(" I")
        ])
    ])
]

b_del: [
    DelGroup([
        DelGroup([
            DelSkip(5), DelWithGroup([]),
            DelSkip(1)
        ]),
        DelWithGroup([
            DelGroup([])
        ]),
        DelSkip(1)
    ])
]
b_add: [
    AddGroup({"tag": "h3"}, [
        AddGroup({"client": "b", "tag": "caret"}, []),
        AddChars("3w"), AddSkip(5), AddWithGroup([]),
        AddSkip(1)
    ]),
    AddWithGroup([])
]
