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You can get the useful core of React-like behavior in a single HTML file with plain JavaScript: keep state, respond to events, and update the page from that state. For a small counter or toggle, an explicit render() function makes the connection clear without adding React or a build step.
Build a small interaction with state and a render function
This example keeps the counter’s value in JavaScript, then uses one function to display it. Save it as an HTML file and open it in a browser; it uses no external scripts.
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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Counter</title>
</head>
<body>
<p>Count: <span id="count"></span></p>
<button id="increment" type="button">Add one</button>
<script>
let state = { count: 0 };
const countElement = document.querySelector("#count");
const incrementButton = document.querySelector("#increment");
function render() {
countElement.textContent = state.count;
}
incrementButton.addEventListener("click", () => {
state.count += 1;
render();
});
render();
</script>
</body>
</html>The loop is deliberately straightforward: the event handler changes state, then render() writes the current value to the page. The initial call displays the starting value. This is an organizing pattern built from browser APIs, not a built-in reactivity system or a React implementation. The DOM selection, event registration, and text update use standard JavaScript and browser features described in MDN’s JavaScript tutorial and its guide to DOM events.
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Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Use textContent for plain text. It treats the value as text rather than parsing it as HTML, which avoids turning user-provided strings into markup. Attach behavior with addEventListener instead of putting JavaScript in an onclick attribute; listeners keep behavior out of the markup and can be removed when needed.
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Choose between rendering a region and updating one node
Use a render function when several displayed values depend on state
As an interaction gains related values—such as a count and a disabled button—put their DOM updates together in render(). That gives one place to inspect how the current state maps to the visible interface.
Update a node directly for a truly isolated change
If one event changes only one value, assigning that node’s textContent directly may be simpler. The trade-off is organization: as more event handlers independently change the same page, it becomes harder to tell which state the screen represents. This is a maintainability choice, not a performance claim.
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Know when the page has outgrown the simple loop
For a one-off tool, tutorial, prototype, or small interaction, state plus event listeners may be enough. If the interface grows into many coordinated regions, reusable components, or shared state, React’s component model can help structure it. The question is not whether plain JavaScript can update a page—it can—but which organization remains understandable as the interface changes.
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Mount React into an existing HTML page
React can manage a specific part of an otherwise ordinary page. Include a target element in the HTML, load React and React DOM, then call createRoot on that element and render into it. React documents this approach for adding React to an existing project, including multiple roots for separate page regions. See Add React to an Existing Project and the createRoot reference.
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That is different from writing React and JSX as though they were native browser syntax in a bare HTML file. JSX needs compilation, and imports generally call for a JavaScript environment. Babel standalone can compile JSX in the browser for demonstrations, but it remains an external dependency and is better treated as a learning or experimental setup than as the default production workflow.
A single HTML file is not necessarily self-contained: if it loads React, React DOM, or Babel from external scripts, it depends on those resources being available over the network. For external JavaScript modules, opening a page with a file:// URL can also cause cross-origin loading problems; MDN’s JavaScript tutorial recommends testing through a local server in that situation.
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Use the right React root for the initial HTML
Use createRoot to render client-side into an empty DOM node. Use hydrateRoot when the node already contains HTML rendered by React on a server; hydration attaches React behavior to that existing markup rather than treating it as an empty client-rendered root. React explains the distinction in the createRoot documentation and hydrateRoot documentation.
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Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Pick an approach based on the scope
| Approach | Setup | Good fit | Trade-off |
|---|---|---|---|
| Plain JavaScript with a render function | Inline script; no framework or build step required | A small standalone interaction where state and display are easy to keep together | You provide the conventions for organizing state and DOM updates |
| Plain JavaScript with targeted updates | Inline script; change the affected DOM node directly | A single, isolated value or response | Many independent updates can make the state-to-screen relationship harder to follow |
| React mounted in a page region | React and React DOM; JSX and imports typically require a JavaScript environment | A widget that benefits from React components, or a page already using React | More dependencies and setup than a no-build vanilla example |
React’s installation guidance, accessed October 7, 2026, recommends starting a new React application with a framework. It also documents trying React locally and building from scratch for learning or constraints that do not fit a framework. The same guidance says Create React App is deprecated. Those recommendations can change, so check the current documentation when starting a project.
For a single-file interaction that should work without a framework or external scripts, use plain JavaScript. For a React widget inside an existing page, mount React into a dedicated region and account for its dependencies. For a new full React application, follow React’s current setup guidance rather than treating a one-file demo as the standard project structure.
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