HTML hidden Attribute
A hidden paragraph:
Definition and Usage
The hidden attribute is a boolean attribute.
When present, it specifies
that an element is not yet, or is no longer,
Browsers should not display elements that have the hidden attribute
The hidden attribute can also be used to keep a user from seeing an element
until some other condition has been met (like selecting a checkbox, etc.). Then,
Differences Between HTML 4.01 and HTML5
The hidden attribute is new in HTML5.
Differences Between HTML and XHTML
In XHTML, attribute minimization is forbidden, and the hidden attribute must
be defined as <element hidden=”hidden”>.