[]
[AddGroup({"tag": "span", "class": "bold"}, [AddSkip(16)])]

[]
[AddSkip(6), AddGroup({"tag": "span", "class": "italic"}, [AddSkip(18)])]

[]
[AddGroup({"tag": "span", "class": "bold"}, [AddSkip(6)]),AddGroup({"tag": "span", "class": "bold italic"}, [AddSkip(10)]),AddGroup({"tag": "span", "class": "italic"}, [AddSkip(8)])]