Represents the contents of the element. The value of this attribute
does not change if the contents of the corresponding form control, in
an interactive user agent, changes. Changing this attribute, however,
resets the contents of the form control.
Represents the current contents of the corresponding form control, in
an interactive user agent. Changing this attribute changes the
contents of the form control, but does not change the contents of the
element. If the entirety of the data can not fit into a single
DOMString , the implementation may truncate the data.