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+# Examples
+
+Recipes for [react-html5-parser](README.md). Each one is self-contained; the [API section of the README](README.md#api) explains every option.
+
+- [Render CMS content in a component](#render-cms-content-in-a-component)
+- [Next.js links and images](#nextjs-links-and-images)
+- [Heading anchors](#heading-anchors)
+- [Syntax-highlighted code blocks](#syntax-highlighted-code-blocks)
+- [Lazy images and scrollable tables](#lazy-images-and-scrollable-tables)
+- [Custom elements as components](#custom-elements-as-components)
+- [Allow YouTube embeds](#allow-youtube-embeds)
+- [Bring your own sanitizer](#bring-your-own-sanitizer)
+- [Server rendering](#server-rendering)
+- [React Native article](#react-native-article)
+
+## Render CMS content in a component
+
+Parse once per HTML string, keep `components` at module scope, and show a fallback when parsing fails.
+
+```tsx
+import { useMemo } from "react";
+import { parse, type Components } from "react-html5-parser";
+
+const components: Components = {
+  table: ({ children, ...props }) => (
+    <div className="table-scroll">
+      <table {...props}>{children}</table>
+    </div>
+  ),
+};
+
+export function Article({ html }: { html: string }) {
+  const content = useMemo(
+    () =>
+      parse(html, {
+        components,
+        onError: (error, html) => reportError({ error, html }),
+      }),
+    [html]
+  );
+
+  return (
+    <article className="prose">
+      {content ?? <p>This article could not be displayed.</p>}
+    </article>
+  );
+}
+```
+
+`components` defined inside `Article` would be a new object on every render, so React would see a new component type per tag and remount the whole tree.
+
+## Next.js links and images
+
+Internal links go through the router; external links open in a new tab. Images with known dimensions go through `next/image`.
+
+```tsx
+import Image from "next/image";
+import Link from "next/link";
+import type { Components } from "react-html5-parser";
+
+export const components: Components = {
+  a: ({ href, children }) => {
+    const url = String(href ?? "");
+
+    return url.startsWith("/") ? (
+      <Link href={url}>{children}</Link>
+    ) : (
+      <a href={url} target="_blank" rel="noopener noreferrer">
+        {children}
+      </a>
+    );
+  },
+  img: ({ src, alt, width, height }) =>
+    width && height ? (
+      <Image
+        src={String(src)}
+        alt={String(alt ?? "")}
+        width={Number(width)}
+        height={Number(height)}
+      />
+    ) : (
+      <img src={String(src)} alt={String(alt ?? "")} loading="lazy" />
+    ),
+};
+```
+
+Remote image hosts must be listed in `images.remotePatterns` in `next.config.js`.
+
+## Heading anchors
+
+Give every `h2` and `h3` a linkable id, generated from its text when the HTML has none.
+
+```tsx
+import type { ReactNode } from "react";
+import type { Components } from "react-html5-parser";
+
+function textOf(node: ReactNode): string {
+  if (typeof node == "string" || typeof node == "number") {
+    return String(node);
+  }
+  if (Array.isArray(node)) {
+    return node.map(textOf).join("");
+  }
+  if (node && typeof node == "object" && "props" in node) {
+    return textOf((node.props as { children?: ReactNode }).children);
+  }
+  return "";
+}
+
+function slugify(text: string) {
+  return text
+    .toLowerCase()
+    .trim()
+    .replace(/[^\w]+/g, "-");
+}
+
+function heading(Tag: "h2" | "h3") {
+  return ({ id, children }: { id?: unknown; children?: ReactNode }) => {
+    const anchor = String(id || slugify(textOf(children)));
+
+    return (
+      <Tag id={anchor}>
+        <a href={`#${anchor}`}>{children}</a>
+      </Tag>
+    );
+  };
+}
+
+export const components: Components = {
+  h2: heading("h2"),
+  h3: heading("h3"),
+};
+```
+
+## Syntax-highlighted code blocks
+
+Rich-text editors usually write `<pre><code class="language-ts">`. Replace `pre` and read the language from the inner `code` element.
+
+```tsx
+import { isValidElement, type ReactElement } from "react";
+import { Highlight } from "prism-react-renderer";
+import type { Components } from "react-html5-parser";
+
+type CodeProps = { className?: string; children?: string | string[] };
+
+export const components: Components = {
+  pre: ({ children }) => {
+    const [code] = [children].flat();
+
+    if (!isValidElement(code) || code.type != "code") {
+      return <pre>{children}</pre>;
+    }
+
+    const { className = "", children: text } = (code as ReactElement<CodeProps>)
+      .props;
+    const language = className.replace(/^language-/, "") || "text";
+
+    return (
+      <Highlight code={[text].flat().join("")} language={language}>
+        {({ className, style, tokens, getLineProps, getTokenProps }) => (
+          <pre className={className} style={style}>
+            {tokens.map((line, i) => (
+              <div key={i} {...getLineProps({ line })}>
+                {line.map((token, key) => (
+                  <span key={key} {...getTokenProps({ token })} />
+                ))}
+              </div>
+            ))}
+          </pre>
+        )}
+      </Highlight>
+    );
+  },
+};
+```
+
+## Lazy images and scrollable tables
+
+`mapElement` adjusts props without replacing a tag; `mapNode` can wrap or drop DOM nodes before they render.
+
+```tsx
+import { cloneElement, type ReactElement } from "react";
+import { parse, renderNode } from "react-html5-parser";
+
+parse(html, {
+  mapElement: (element: ReactElement) =>
+    element.type == "img"
+      ? cloneElement(element, { loading: "lazy", decoding: "async" })
+      : element,
+
+  mapNode: (node, key, options) => {
+    // Rich-text editors leave empty paragraphs behind.
+    if (node.nodeName == "P" && !node.textContent?.trim()) {
+      return null;
+    }
+
+    if (node.nodeName == "TABLE") {
+      // Without `mapNode: undefined`, renderNode would call this function
+      // on the same table again, forever.
+      return (
+        <div key={key} className="table-scroll">
+          {renderNode(node, key, { ...options, mapNode: undefined })}
+        </div>
+      );
+    }
+
+    return node;
+  },
+});
+```
+
+## Custom elements as components
+
+Unknown tags are removed by the sanitizer and their content is kept. A tag you map in `components` is allowed, along with its attributes (minus event handlers and `javascript:` values).
+
+```tsx
+import { parse } from "react-html5-parser";
+
+parse('<x-callout type="warning">Back up your data first.</x-callout>', {
+  components: {
+    "x-callout": ({ type, children }) => (
+      <aside className={`callout callout-${String(type ?? "info")}`}>
+        {children}
+      </aside>
+    ),
+  },
+});
+// <><aside className="callout callout-warning">Back up your data first.</aside></>
+```
+
+This is a safe way to let authors place your own widgets in HTML content.
+
+## Allow YouTube embeds
+
+Frames are removed by default. Mapping `iframe` in `components` lets it through the sanitizer, and the component decides which sources render.
+
+```tsx
+import { parse } from "react-html5-parser";
+
+const YOUTUBE = /^https:\/\/www\.youtube(-nocookie)?\.com\/embed\/[\w-]+$/;
+
+parse(html, {
+  components: {
+    iframe: ({ src, title }) =>
+      typeof src == "string" && YOUTUBE.test(src) ? (
+        <iframe
+          src={src}
+          title={String(title ?? "YouTube video")}
+          sandbox="allow-scripts allow-same-origin allow-presentation"
+          allow="encrypted-media; picture-in-picture"
+          allowFullScreen
+        />
+      ) : null,
+  },
+});
+```
+
+Always check `src` in the component: a mapped `iframe` passes the sanitizer with any http(s) source.
+
+## Bring your own sanitizer
+
+The core entry skips DOMPurify (3 kB instead of 15 kB). Use it when the HTML is already trusted, or pass your own sanitizer.
+
+```tsx
+import { parse } from "react-html5-parser/core";
+import sanitizeHtml from "sanitize-html";
+
+parse(html, {
+  sanitize: (html) =>
+    sanitizeHtml(html, {
+      allowedTags: ["p", "a", "b", "i", "ul", "ol", "li", "br"],
+      allowedAttributes: { a: ["href"] },
+    }),
+});
+```
+
+`sanitize` runs on the string before parsing. On the default entry it runs before DOMPurify, never instead of it.
+
+## Server rendering
+
+The browser entries parse with the DOM, so on the server `parse` returns `null` and reports a `ReferenceError` to `onError`. Render the HTML on the client, and show a placeholder until then:
+
+```tsx
+"use client";
+
+import { useEffect, useState, type ReactNode } from "react";
+import { parse } from "react-html5-parser";
+
+export function ClientHtml({ html }: { html: string }) {
+  const [content, setContent] = useState<ReactNode>(null);
+
+  useEffect(() => {
+    setContent(parse(html));
+  }, [html]);
+
+  return <div className="prose">{content}</div>;
+}
+```
+
+If the content matters for SEO, sanitize the HTML on the server with your own tool and render it there instead.
+
+## React Native article
+
+Style tags, open links in an in-app browser, and replace images.
+
+```tsx
+import { Image, ScrollView } from "react-native";
+import * as WebBrowser from "expo-web-browser";
+import { parse } from "react-html5-parser/native";
+
+const tagStyles = {
+  h1: { text: { fontSize: 28, fontWeight: "700", marginBottom: 12 } },
+  p: { view: { marginBottom: 12 } },
+  a: { text: { color: "#0a66c2" } },
+  code: { text: { fontFamily: "Menlo", backgroundColor: "#f2f2f2" } },
+};
+
+export function Article({ html }: { html: string }) {
+  return (
+    <ScrollView contentContainerStyle={{ padding: 16 }}>
+      {parse(html, {
+        tagStyles,
+        textStyle: { fontSize: 16, lineHeight: 24 },
+        onLinkPress: (href) => {
+          // onLinkPress receives every link, relative ones included;
+          // checking the URL is up to you.
+          if (/^https?:\/\//.test(href)) {
+            WebBrowser.openBrowserAsync(href);
+          }
+        },
+      })}
+    </ScrollView>
+  );
+}
+```
+
+Without `onLinkPress`, links open through `Linking` for `http:`, `https:`, `mailto:` and `tel:` only.