This example demonstrates loading live weather data for London and displaying the current condition, initially set to "cloudy," in an HTML span element. It uses the browser's native `fetch` API to retrieve a JSON file from a GitHub Gist, then parses the response with `response.json()`. The code updates the DOM by querying the span with `document.querySelector` and setting its `innerHTML` to the `main` weather value from the retrieved data. React and ReactDOM are included via UMD scripts but are not actively used in the interaction.