What Is Wrong with My "checked" Attribute Values?

Attribute "checked" is an optional attribute for XHTML element "input". In XHTML specification, attribute "checked" has only predefined value: "checked". However, in HTML specification, attribute "checked" requires no value.

If you are converting existing HTML documents to XHTML format, you will get some syntax error on your pre-selected items in radio buttons, check boxes and dropdown lists, "checked" attributes are used without any values.

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