OpenSP: "..." is not a member of a group specified for any attribute
Cause:
The tag contains an attribute that is proprietary to Netscape or Internet Explorer.
And the tag has no value.
Example:
Sample: NOWRAP is not a member of a group specified for any attribute
 | <table nowrap> |
 | <table style="white-space: nowrap"> |
Solution:
Most tags have a equivalents in standard HTML or CSS.
Tag | Proprietary attribute | Standard attribute
|
<table> | nowrap | style="white-space: nowrap" or use nowrap in <td> or <th>
|
References: