Load the code from a CDN, create your component using React.createClass and render it, JSX is a nice add-on but is not required, and if the syntax of React.createClass is too verbose you could use htm to use a pseudo JSX syntax using template literals (the docs mentions Preact but it works with React too).
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React could also totally run on browsers, the documentation also explain you how to do it
Load the code from a CDN, create your component using React.createClass and render it, JSX is a nice add-on but is not required, and if the syntax of React.createClass is too verbose you could use htm to use a pseudo JSX syntax using template literals (the docs mentions Preact but it works with React too).