diff --git a/e2e/editor-callout-collapsible.spec.ts b/e2e/editor-callout-collapsible.spec.ts
new file mode 100644
index 00000000..e5207a44
--- /dev/null
+++ b/e2e/editor-callout-collapsible.spec.ts
@@ -0,0 +1,137 @@
+import { test, expect } from "./fixtures/auth";
+import { navigateToEditorPage } from "./fixtures/editor-helpers";
+
+/**
+ * Helper: insert a block via the slash command menu.
+ * Types `/<command>`, waits for the matching option, and clicks it.
+ */
+async function insertViaSlashCommand(
+  page: import("@playwright/test").Page,
+  commandLabel: string
+) {
+  const editor = page.locator('[contenteditable="true"]');
+  await editor.click();
+  await page.keyboard.press("End");
+  await page.keyboard.press("Enter");
+  await page.keyboard.type("/");
+
+  const option = page
+    .locator('[role="option"]')
+    .filter({ hasText: commandLabel });
+  await expect(option).toBeVisible({ timeout: 3_000 });
+  await option.click();
+}
+
+test.describe("Callout block", () => {
+  test.beforeEach(async ({ authenticatedPage: page }) => {
+    await navigateToEditorPage(page);
+  });
+
+  test("insert callout via /callout and verify distinct styling", async ({
+    authenticatedPage: page,
+  }) => {
+    const editor = page.locator('[contenteditable="true"]');
+    await expect(editor).toBeVisible({ timeout: 10_000 });
+
+    await insertViaSlashCommand(page, "Callout");
+
+    // The callout renders as a div with border-l-2 and an emoji span
+    const callout = editor.locator(".callout-emoji").first();
+    await expect(callout).toBeVisible({ timeout: 3_000 });
+
+    // Verify the callout container has distinct styling (border-l-2 class)
+    // that differentiates it from a code block
+    const calloutContainer = callout.locator("..");
+    await expect(calloutContainer).toHaveClass(/border-l-2/);
+    await expect(calloutContainer).toHaveClass(/bg-muted/);
+
+    // The emoji should be the default 💡
+    await expect(callout).toHaveText("💡");
+
+    // Verify it does NOT look like a code block — code blocks use <code>
+    // elements, callouts use a div with border-l styling
+    const calloutTag = await calloutContainer.evaluate((el) =>
+      el.tagName.toLowerCase()
+    );
+    expect(calloutTag).toBe("div");
+  });
+});
+
+test.describe("Collapsible/Toggle block", () => {
+  test.beforeEach(async ({ authenticatedPage: page }) => {
+    await navigateToEditorPage(page);
+  });
+
+  test("insert toggle via /toggle and verify expand/collapse", async ({
+    authenticatedPage: page,
+  }) => {
+    const editor = page.locator('[contenteditable="true"]');
+    await expect(editor).toBeVisible({ timeout: 10_000 });
+
+    await insertViaSlashCommand(page, "Toggle");
+
+    // The collapsible renders as a <details> element with a <summary>
+    const details = editor.locator("details").first();
+    await expect(details).toBeVisible({ timeout: 3_000 });
+
+    // It should start open (the plugin sets open=true by default)
+    await expect(details).toHaveAttribute("open", "");
+
+    // The content area should be visible when open
+    const content = details.locator("summary + div");
+    await expect(content).toBeVisible();
+
+    // Click the chevron toggle button to collapse
+    const chevron = details.locator(".collapsible-toggle").first();
+    await expect(chevron).toBeVisible();
+    await chevron.click();
+
+    // After clicking, the details element should no longer have the open attribute
+    await expect(details).not.toHaveAttribute("open", "", { timeout: 2_000 });
+
+    // The content should be hidden when collapsed
+    await expect(content).not.toBeVisible();
+
+    // Click again to re-expand
+    await chevron.click();
+    await expect(details).toHaveAttribute("open", "", { timeout: 2_000 });
+    await expect(content).toBeVisible();
+  });
+
+  test("type content inside collapsible content area and verify persistence", async ({
+    authenticatedPage: page,
+  }) => {
+    const editor = page.locator('[contenteditable="true"]');
+    await expect(editor).toBeVisible({ timeout: 10_000 });
+
+    await insertViaSlashCommand(page, "Toggle");
+
+    const details = editor.locator("details").first();
+    await expect(details).toBeVisible({ timeout: 3_000 });
+
+    // The content area is the div after the summary, containing a paragraph
+    const contentArea = details.locator("summary + div");
+    await expect(contentArea).toBeVisible();
+
+    // The default content paragraph has "Toggle content" — click into it
+    const contentParagraph = contentArea.locator("p").first();
+    await expect(contentParagraph).toBeVisible();
+    await contentParagraph.click();
+
+    // Triple-click to select just the paragraph text, then type replacement
+    await contentParagraph.click({ clickCount: 3 });
+    await page.keyboard.type("My custom toggle content");
+
+    // Verify the typed text appears in the content area
+    await expect(contentArea).toContainText("My custom toggle content");
+
+    // Collapse and re-expand to verify content persists
+    const chevron = details.locator(".collapsible-toggle").first();
+    await chevron.click();
+    await expect(details).not.toHaveAttribute("open", "", { timeout: 2_000 });
+
+    await chevron.click();
+    await expect(details).toHaveAttribute("open", "", { timeout: 2_000 });
+    await expect(contentArea).toContainText("My custom toggle content");
+  });
+});