!adf:date{attrs=empty} !adf:date{content=empty}

a!adf:hardBreak{marks=empty}b

!adf:mention[@M]{content=empty id=x}

bare!adf:carry{json="{\"marks\":[],\"text\":\"marked\",\"type\":\"text\"}"}

!adf:carry{json="{\"marks\":[{\"attrs\":{},\"type\":\"em\"}],\"text\":\"x\",\"type\":\"text\"}"} and !adf:carry{json="{\"attrs\":{\"shortName\":\":a:\"},\"marks\":[{\"attrs\":{},\"type\":\"strong\"}],\"type\":\"emoji\"}"}