What Are Predefined Attribute Values

Q

What Are Predefined Attribute Values? - XHTML Tutorials - Introduction To Tag and Attribute Syntax

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A

Some XHTML attributes have predefined values. If an attribute has predefined values, you must use one of the predefined values.

For example, attribute "valign" of element "td" has 4 predefined values "baseline", "bottom", "middle", and "top". Here are some examples of how to use "valign" attribute:

<td valign="top"> - Valid, "top" is one of the predefined values of "valign".
<td valign="center"> - Invalid, "center" is not a predefined value of "valign".

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