react.dev/tips/13-false-in-jsx.md

id	title	layout	permalink	prev
false-in-jsx	False in JSX	tips	false-in-jsx.html	initial-ajax.html

Here's how false renders in different contexts:

Renders as id="false":

/** @jsx React.DOM */
React.renderComponent(<div id={false} />, mountNode);

String "false" as input value:

/** @jsx React.DOM */
React.renderComponent(<input value={false} />, mountNode);

No child:

/** @jsx React.DOM */
React.renderComponent(<div>{false}</div>, mountNode);

The reason why this one doesn't render as the string "false" as a div child is to allow the more common use-case: <div>{x > 1 && 'You have more than one item'}</div>.