- The option for a Boolean attribute not to have a value. That is, the attribute alone is enough, so that when the attribute is set without a value, it counts as true. In XML-based languages, attribute minimization is disallowed and attributes must have a value; for example, in XHTML,
checked is invalid, and must be written checked="checked".
- Related terms: Custom data attribute, Entity–attribute–value, Attribute, IDness
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