tag_attr_value
tag_attr_value (tagname, attr[, doc])
This function returns the current global value of the attribute named attr for the tag specified by tagname.
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If you have applied an alias map to the document, tagname and attr can be either aliases or real names. However, this function will return the real name of the attribute value, not its alias.
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If attr is not a valid attribute or tagname is not a valid tag, a null string is returned.
The doc argument specifies the identifier of the document tree. If doc omitted or 0, the current document is used.
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If the document type definition for your document instance includes the NAMECASE GENERAL NO setting, then the tagname parameter will be case sensitive.
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