Some frameworks , such as Bootstrap , make use of CSS-based declarations to standardize overall behavior in certain elements.

In this case, padding :

td, th {
    padding: 0;
}

The problem is that when generating content from a WYSIWYG editor, some settings are conflicting with the framework where this content is going to be inserted:

<table border="1" align="left" cellspacing="0" cellpadding="6" style="width:100%">
  <!-- ... -->
</table>

Essentially, the cellpadding attribute will not produce the desired effect since the framework will subscribe to it with the statement above.

Question

reset to the declaration of padding so that in a specific location the cellpadding attribute can be used by the browser?

td, th {
    padding: auto; /* incorreto pois não existe, mas reflete o que se pretende */
}