resetAttributes command
resetAttributes resets the specified attributes of a node or mark to their default values.
Parameters
typeOrName: string | NodeType | MarkType
The name or type of the node or mark whose attributes should be reset.
attributes: string | string[]
A string or an array of strings that defines which attributes should be reset.
Use the resetAttributes command
// reset the style and class attributes on the currently selected paragraph nodes
editor.commands.resetAttributes('paragraph', ['style', 'class'])