diff --git a/build-scripts/gulp/webpack.js b/build-scripts/gulp/webpack.js
index 8639296a6e..e257fd58a7 100644
--- a/build-scripts/gulp/webpack.js
+++ b/build-scripts/gulp/webpack.js
@@ -35,26 +35,29 @@ const isWsl =
  *   listenHost?: string
  * }}
  */
-const runDevServer = ({
+const runDevServer = async ({
   compiler,
   contentBase,
   port,
   listenHost = "localhost",
-}) =>
-  new WebpackDevServer(compiler, {
-    open: true,
-    watchContentBase: true,
-    contentBase,
-  }).listen(port, listenHost, (err) => {
-    if (err) {
-      throw err;
-    }
-    // Server listening
-    log(
-      "[webpack-dev-server]",
-      `Project is running at http://localhost:${port}`
-    );
-  });
+}) => {
+  const server = new WebpackDevServer(
+    {
+      open: true,
+      host: listenHost,
+      port,
+      static: {
+        directory: contentBase,
+        watch: true,
+      },
+    },
+    compiler
+  );
+
+  await server.start();
+  // Server listening
+  log("[webpack-dev-server]", `Project is running at http://localhost:${port}`);
+};
 
 const doneHandler = (done) => (err, stats) => {
   if (err) {
@@ -107,13 +110,13 @@ gulp.task("webpack-prod-app", () =>
   )
 );
 
-gulp.task("webpack-dev-server-demo", () => {
+gulp.task("webpack-dev-server-demo", () =>
   runDevServer({
     compiler: webpack(bothBuilds(createDemoConfig, { isProdBuild: false })),
     contentBase: paths.demo_output_root,
     port: 8090,
-  });
-});
+  })
+);
 
 gulp.task("webpack-prod-demo", () =>
   prodBuild(
@@ -123,15 +126,15 @@ gulp.task("webpack-prod-demo", () =>
   )
 );
 
-gulp.task("webpack-dev-server-cast", () => {
+gulp.task("webpack-dev-server-cast", () =>
   runDevServer({
     compiler: webpack(bothBuilds(createCastConfig, { isProdBuild: false })),
     contentBase: paths.cast_output_root,
     port: 8080,
     // Accessible from the network, because that's how Cast hits it.
     listenHost: "0.0.0.0",
-  });
-});
+  })
+);
 
 gulp.task("webpack-prod-cast", () =>
   prodBuild(
@@ -164,14 +167,14 @@ gulp.task("webpack-prod-hassio", () =>
   )
 );
 
-gulp.task("webpack-dev-server-gallery", () => {
+gulp.task("webpack-dev-server-gallery", () =>
   runDevServer({
     // We don't use the es5 build, but the dev server will fuck up the publicPath if we don't
     compiler: webpack(bothBuilds(createGalleryConfig, { isProdBuild: false })),
     contentBase: paths.gallery_output_root,
     port: 8100,
-  });
-});
+  })
+);
 
 gulp.task("webpack-prod-gallery", () =>
   prodBuild(
diff --git a/gallery/src/demos/demo-ha-form.ts b/gallery/src/demos/demo-ha-form.ts
new file mode 100644
index 0000000000..9f5f9a3d54
--- /dev/null
+++ b/gallery/src/demos/demo-ha-form.ts
@@ -0,0 +1,212 @@
+/* eslint-disable lit/no-template-arrow */
+import { LitElement, TemplateResult, css, html } from "lit";
+import { customElement } from "lit/decorators";
+import "../../../src/components/ha-form/ha-form";
+import "../../../src/components/ha-card";
+import { applyThemesOnElement } from "../../../src/common/dom/apply_themes_on_element";
+import type { HaFormSchema } from "../../../src/components/ha-form/ha-form";
+
+const SCHEMAS: {
+  title: string;
+  translations?: Record<string, string>;
+  error?: Record<string, string>;
+  schema: HaFormSchema[];
+}[] = [
+  {
+    title: "Authentication",
+    translations: {
+      username: "Username",
+      password: "Password",
+      invalid_login: "Invalid login",
+    },
+    error: {
+      base: "invalid_login",
+    },
+    schema: [
+      {
+        type: "string",
+        name: "username",
+        required: true,
+      },
+      {
+        type: "string",
+        name: "password",
+        required: true,
+      },
+    ],
+  },
+
+  {
+    title: "One of each",
+    schema: [
+      {
+        type: "constant",
+        value: "Constant Value",
+        name: "constant",
+        required: true,
+      },
+      {
+        type: "boolean",
+        name: "bool",
+        optional: true,
+        default: false,
+      },
+      {
+        type: "integer",
+        name: "int",
+        optional: true,
+        default: 10,
+      },
+      {
+        type: "string",
+        name: "string",
+        optional: true,
+        default: "Default",
+      },
+      {
+        type: "select",
+        options: [
+          ["default", "default"],
+          ["other", "other"],
+        ],
+        name: "select",
+        optional: true,
+        default: "default",
+      },
+      {
+        type: "multi_select",
+        options: {
+          default: "Default",
+          other: "Other",
+        },
+        name: "multi",
+        optional: true,
+        default: ["default"],
+      },
+    ],
+  },
+  {
+    title: "Multi select",
+    schema: [
+      {
+        type: "multi_select",
+        options: {
+          default: "Default",
+          other: "Other",
+        },
+        name: "multi",
+        optional: true,
+        default: ["default"],
+      },
+      {
+        type: "multi_select",
+        options: {
+          default: "Default",
+          other: "Other",
+          uno: "mas",
+          one: "more",
+          and: "another_one",
+          option: "1000",
+        },
+        name: "multi",
+        optional: true,
+        default: ["default"],
+      },
+    ],
+  },
+];
+
+@customElement("demo-ha-form")
+class DemoHaForm extends LitElement {
+  private lightModeData: any = [];
+
+  private darkModeData: any = [];
+
+  protected render(): TemplateResult {
+    return html`
+      ${SCHEMAS.map((info, idx) => {
+        const translations = info.translations || {};
+        const computeLabel = (schema) =>
+          translations[schema.name] || schema.name;
+        const computeError = (error) => translations[error] || error;
+
+        return [
+          [this.lightModeData, "light"],
+          [this.darkModeData, "dark"],
+        ].map(
+          ([data, type]) => html`
+            <div class="row" data-type=${type}>
+              <ha-card .header=${info.title}>
+                <div class="card-content">
+                  <ha-form
+                    .data=${data[idx]}
+                    .schema=${info.schema}
+                    .error=${info.error}
+                    .computeError=${computeError}
+                    .computeLabel=${computeLabel}
+                    @value-changed=${(e) => {
+                      data[idx] = e.detail.value;
+                      this.requestUpdate();
+                    }}
+                  ></ha-form>
+                </div>
+              </ha-card>
+              <pre>${JSON.stringify(data[idx], undefined, 2)}</pre>
+            </div>
+          `
+        );
+      })}
+    `;
+  }
+
+  firstUpdated(changedProps) {
+    super.firstUpdated(changedProps);
+    this.shadowRoot!.querySelectorAll("[data-type=dark]").forEach((el) => {
+      applyThemesOnElement(
+        el,
+        {
+          default_theme: "default",
+          default_dark_theme: "default",
+          themes: {},
+          darkMode: false,
+        },
+        "default",
+        { dark: true }
+      );
+    });
+  }
+
+  static styles = css`
+    .row {
+      margin: 0 auto;
+      max-width: 800px;
+      display: flex;
+      padding: 50px;
+      background-color: var(--primary-background-color);
+    }
+    ha-card {
+      width: 100%;
+      max-width: 384px;
+    }
+    pre {
+      width: 400px;
+      margin: 0 16px;
+      overflow: auto;
+      color: var(--primary-text-color);
+    }
+    @media only screen and (max-width: 800px) {
+      .row {
+        flex-direction: column;
+      }
+      pre {
+        margin: 16px 0;
+      }
+    }
+  `;
+}
+
+declare global {
+  interface HTMLElementTagNameMap {
+    "demo-ha-form": DemoHaForm;
+  }
+}