diff --git a/canvas/src/components/__tests__/ConsoleModal.test.tsx b/canvas/src/components/__tests__/ConsoleModal.test.tsx
index fb44eadc..6e816f1d 100644
--- a/canvas/src/components/__tests__/ConsoleModal.test.tsx
+++ b/canvas/src/components/__tests__/ConsoleModal.test.tsx
@@ -71,3 +71,54 @@ describe("ConsoleModal", () => {
     expect(onClose).toHaveBeenCalled();
   });
 });
+
+// ── WCAG 2.1 dialog accessibility ─────────────────────────────────────────────
+
+describe("ConsoleModal — WCAG 2.1 dialog accessibility", () => {
+  it("renders role=dialog when open", async () => {
+    mockGet.mockResolvedValueOnce({ output: "" });
+    render(<ConsoleModal workspaceId="ws-1" open={true} onClose={() => {}} />);
+    await waitFor(() => expect(screen.queryByRole("dialog")).toBeTruthy());
+  });
+
+  it("dialog has aria-modal='true' (WCAG 2.1 SC 1.3.2)", async () => {
+    mockGet.mockResolvedValueOnce({ output: "" });
+    render(<ConsoleModal workspaceId="ws-1" open={true} onClose={() => {}} />);
+    const dialog = await waitFor(() => screen.getByRole("dialog"));
+    expect(dialog.getAttribute("aria-modal")).toBe("true");
+  });
+
+  it("dialog has aria-labelledby pointing to the title", async () => {
+    mockGet.mockResolvedValueOnce({ output: "" });
+    render(<ConsoleModal workspaceId="ws-1" open={true} onClose={() => {}} />);
+    const dialog = await waitFor(() => screen.getByRole("dialog"));
+    const labelledBy = dialog.getAttribute("aria-labelledby");
+    expect(labelledBy).toBeTruthy();
+    const titleEl = document.getElementById(labelledBy!);
+    expect(titleEl?.textContent?.trim()).toBe("EC2 console output");
+  });
+
+  it("backdrop div has aria-hidden='true' so screen readers skip it (WCAG 4.1.2)", async () => {
+    mockGet.mockResolvedValueOnce({ output: "" });
+    render(<ConsoleModal workspaceId="ws-1" open={true} onClose={() => {}} />);
+    const backdrop = document.querySelector('[aria-hidden="true"]');
+    expect(backdrop).toBeTruthy();
+    expect(backdrop?.className).toContain("bg-black");
+  });
+
+  it("error div has role=alert (WCAG 4.1.3)", async () => {
+    mockGet.mockRejectedValueOnce(new Error("GET /workspaces/ws-1/console: 404 Not Found"));
+    render(<ConsoleModal workspaceId="ws-1" open={true} onClose={() => {}} />);
+    const alert = await waitFor(() => screen.getByRole("alert"));
+    expect(alert).toBeTruthy();
+    expect(alert.textContent).toMatch(/No EC2 instance found/i);
+  });
+
+  it("Close button has accessible name via aria-label", async () => {
+    mockGet.mockResolvedValueOnce({ output: "" });
+    render(<ConsoleModal workspaceId="ws-1" open={true} onClose={() => {}} />);
+    // Two close buttons: X icon (aria-label="Close") and text "Close" button
+    const closeBtns = await waitFor(() => screen.getAllByRole("button", { name: /close/i }));
+    expect(closeBtns.length).toBeGreaterThanOrEqual(1);
+  });
+});
diff --git a/canvas/src/components/__tests__/DeleteCascadeConfirmDialog.test.tsx b/canvas/src/components/__tests__/DeleteCascadeConfirmDialog.test.tsx
new file mode 100644
index 00000000..9f20a104
--- /dev/null
+++ b/canvas/src/components/__tests__/DeleteCascadeConfirmDialog.test.tsx
@@ -0,0 +1,165 @@
+// @vitest-environment jsdom
+/**
+ * DeleteCascadeConfirmDialog — WCAG 2.1 dialog accessibility + interaction tests
+ */
+import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
+import { render, screen, fireEvent, cleanup, waitFor } from "@testing-library/react";
+
+afterEach(cleanup);
+
+import { DeleteCascadeConfirmDialog } from "../DeleteCascadeConfirmDialog";
+
+const defaultProps = {
+  name: "Test Workspace",
+  children: [
+    { id: "ws-child-1", name: "Child Workspace 1" },
+    { id: "ws-child-2", name: "Child Workspace 2" },
+  ],
+  checked: false,
+  onCheckedChange: vi.fn(),
+  onConfirm: vi.fn(),
+  onCancel: vi.fn(),
+};
+
+function renderDialog(props = {}) {
+  return render(<DeleteCascadeConfirmDialog {...defaultProps} {...props} />);
+}
+
+describe("DeleteCascadeConfirmDialog — basic rendering", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("renders the dialog with correct title", () => {
+    renderDialog();
+    expect(screen.getByText("Delete Workspace and Children")).toBeTruthy();
+  });
+
+  it("renders child workspace names in the list", () => {
+    renderDialog();
+    expect(screen.getByText("Child Workspace 1")).toBeTruthy();
+    expect(screen.getByText("Child Workspace 2")).toBeTruthy();
+  });
+
+  it("Delete All button is disabled when checkbox is unchecked", () => {
+    renderDialog({ checked: false });
+    const deleteBtn = screen.getByRole("button", { name: "Delete All" });
+    // disabled={!checked}={!false}={true} → button has disabled attribute
+    expect(deleteBtn.getAttribute("disabled") !== null).toBe(true);
+  });
+
+  it("Delete All button is enabled when checkbox is checked", () => {
+    renderDialog({ checked: true });
+    const deleteBtn = screen.getByRole("button", { name: "Delete All" });
+    expect(deleteBtn.getAttribute("disabled")).toBeFalsy();
+  });
+
+  it("checking the checkbox calls onCheckedChange", () => {
+    renderDialog();
+    const checkbox = screen.getByRole("checkbox");
+    fireEvent.click(checkbox);
+    expect(defaultProps.onCheckedChange).toHaveBeenCalledWith(true);
+  });
+
+  it("Cancel button calls onCancel", () => {
+    renderDialog();
+    fireEvent.click(screen.getByRole("button", { name: "Cancel" }));
+    expect(defaultProps.onCancel).toHaveBeenCalledTimes(1);
+  });
+
+  it("Delete All button calls onConfirm when enabled", () => {
+    renderDialog({ checked: true });
+    fireEvent.click(screen.getByRole("button", { name: "Delete All" }));
+    expect(defaultProps.onConfirm).toHaveBeenCalledTimes(1);
+  });
+});
+
+describe("DeleteCascadeConfirmDialog — WCAG 2.1 dialog accessibility", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("renders role=dialog", () => {
+    renderDialog();
+    expect(screen.getByRole("dialog")).toBeTruthy();
+  });
+
+  it("dialog has aria-modal='true' (WCAG 2.1 SC 1.3.2)", () => {
+    renderDialog();
+    const dialog = screen.getByRole("dialog");
+    expect(dialog.getAttribute("aria-modal")).toBe("true");
+  });
+
+  it("dialog has aria-labelledby pointing to the title", () => {
+    renderDialog();
+    const dialog = screen.getByRole("dialog");
+    const labelledBy = dialog.getAttribute("aria-labelledby");
+    expect(labelledBy).toBeTruthy();
+    const titleEl = document.getElementById(labelledBy!);
+    expect(titleEl?.textContent?.trim()).toBe("Delete Workspace and Children");
+  });
+
+  it("backdrop div has aria-hidden='true' so screen readers skip it (WCAG 4.1.2)", () => {
+    renderDialog();
+    const backdrop = document.querySelector('[aria-hidden="true"]');
+    expect(backdrop).toBeTruthy();
+    expect(backdrop?.className).toContain("bg-black");
+  });
+
+  it("warning SVG icon has aria-hidden='true' (decorative)", () => {
+    renderDialog();
+    const dialog = screen.getByRole("dialog");
+    const svgIcons = dialog.querySelectorAll("svg");
+    // The warning triangle SVG should have aria-hidden
+    const warningSvg = svgIcons[0];
+    expect(warningSvg?.getAttribute("aria-hidden")).toBe("true");
+  });
+
+  it("all interactive buttons have accessible names", () => {
+    renderDialog();
+    const buttons = screen.getAllByRole("button");
+    for (const btn of buttons) {
+      const name = btn.textContent?.trim();
+      expect(name?.length).toBeGreaterThan(0);
+    }
+  });
+
+  it("checkbox is labelled by the cascade warning text", () => {
+    renderDialog();
+    const checkbox = screen.getByRole("checkbox");
+    expect(checkbox).toBeTruthy();
+    // The label wrapping the checkbox provides the accessible name
+    expect(
+      screen.getByText(/I understand this will permanently delete/i),
+    ).toBeTruthy();
+  });
+});
+
+describe("DeleteCascadeConfirmDialog — keyboard interaction", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("Escape key calls onCancel", () => {
+    renderDialog();
+    fireEvent.keyDown(window, { key: "Escape" });
+    expect(defaultProps.onCancel).toHaveBeenCalledTimes(1);
+  });
+
+  it("Enter key on checkbox does NOT confirm when unchecked", () => {
+    renderDialog({ checked: false });
+    const checkbox = screen.getByRole("checkbox");
+    checkbox.focus();
+    fireEvent.keyDown(checkbox, { key: "Enter" });
+    // onConfirm should NOT be called because checkbox is unchecked
+    expect(defaultProps.onConfirm).not.toHaveBeenCalled();
+  });
+
+  it("Enter key on checkbox confirms when checked", () => {
+    renderDialog({ checked: true });
+    const checkbox = screen.getByRole("checkbox");
+    checkbox.focus();
+    fireEvent.keyDown(checkbox, { key: "Enter" });
+    expect(defaultProps.onConfirm).toHaveBeenCalledTimes(1);
+  });
+});