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

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

Here's how false renders in different contexts:

Renders as id="false":

React.render(<div id={false} />, mountNode);

String "false" as input value:

React.render(<input value={false} />, mountNode);

No child:

React.render(<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>.