This property can be set under script control. The following values are appropriate for use with it:
When set to false, the content cannot be changed. When set to inherit, the ability to change the content depends on the setting of this property in the parent Node.
You cannot set this property on the following element types:
However you can work around this by placing <DIV> and <SPAN> elements inside the table cells and then setting their contentEditable property as needed.