Number Attribute Type

The Number Attribute Type is a data type defined by XHTML Modularisation 1.1, declared in the DTD as XML 1.0 type CDATA.
Reference: *W3C - XHTML Modularisation 1.1 - Attribute Types

Specific Attributes with Type Number

1. cols - #REQUIRED:
   This is declared on the element: textarea
2. colspan - default="1":
   This is declared on the elements: th, td
3. maxlength:
   This is declared on the elements: input type="text", input type="password"
4. rbspan - default="1":
   This is declared on the element: rt
5. rows - #REQUIRED:
   This is declared on the element: textarea
6. rowspan - default="1":
   This is declared on the elements: th, td
7. size:
   This is declared on the elements: input type="text", input type="password", input type="file", select
8. span - default="1":
   This is declared on the elements: col, colgroup
9. tabindex:
   This is declared on the elements: a, object, area, input, textarea, select, button

Common Attributes with Type Number

There are no Common Attributes with type Number.

Attribute Value for Type Number

One or more digits, making up a single positive number (or zero) e.g. "34", "2"

For some attributes, a value of "0" makes sense (e.g. tabindex), or is a special case (e.g. colspan, rowspan, although "0" values for these attributes are not well supported); for others, only positive numbers are suitable (e.g. span, size, maxlength, cols, rows, rbspan).