No, though of course you can do:
var container = document.getElementById('content');
React.renderComponent(
<Swoosh
foo={container.getAttribute('foo')}
bar={container.getAttribute('bar')}
bav={container.getAttribute('bav')} />,
container
);
(or if you want to make an attributes dict using something like https://stackoverflow.com/a/5282801/49485, then you can do Swoosh(attributes)
).