diff --git a/tests/engine/cli/dom.test.ts b/tests/engine/cli/dom.test.ts
new file mode 100644
index 000000000..52b473063
--- /dev/null
+++ b/tests/engine/cli/dom.test.ts
@@ -0,0 +1,186 @@
+import { expect, setDefaultTimeout, test } from 'bun:test'
+import { mkdtemp } from 'node:fs/promises'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+
+import { parseFigFile } from '@open-pencil/core/io'
+import type { SceneNode } from '@open-pencil/core/scene-graph'
+
+import { cliSourcePath } from '#tests/helpers/paths'
+
+setDefaultTimeout(30_000)
+
+const CLI = cliSourcePath('index.ts')
+
+interface CommandResult {
+  stdout: string
+  stderr: string
+  exitCode: number
+}
+
+async function run(args: string[]): Promise<CommandResult> {
+  const proc = Bun.spawn(['bun', CLI, ...args], {
+    stdout: 'pipe',
+    stderr: 'pipe'
+  })
+  const [stdout, stderr] = await Promise.all([
+    new Response(proc.stdout).text(),
+    new Response(proc.stderr).text()
+  ])
+  const exitCode = await proc.exited
+  return { stdout: stdout.trim(), stderr: stderr.trim(), exitCode }
+}
+
+async function createFixture() {
+  const dir = await mkdtemp(join(tmpdir(), 'open-pencil-dom-cli-'))
+  const htmlPath = join(dir, 'card.html')
+  const cssPath = join(dir, 'card.css')
+
+  await Bun.write(
+    htmlPath,
+    `
+      <article class="card">
+        <h1>DOM/CSS card</h1>
+        <p>Imported from HTML and CSS.</p>
+      </article>
+    `
+  )
+  await Bun.write(
+    cssPath,
+    `
+      .card {
+        display: flex;
+        flex-direction: column;
+        gap: 8px;
+        width: 240px;
+        padding: 24px;
+        background: #ffffff;
+        border: 1px solid #dddddd;
+        border-radius: 16px;
+      }
+      h1 {
+        font-size: 24px;
+      }
+    `
+  )
+
+  return { dir, htmlPath, cssPath }
+}
+
+function findNode(nodes: Iterable<SceneNode>, name: string): SceneNode | undefined {
+  for (const node of nodes) {
+    if (node.name === name) return node
+  }
+}
+
+test('dom CLI writes DesignDOM JSON output', async () => {
+  const { htmlPath, cssPath, dir } = await createFixture()
+  const output = join(dir, 'card.json')
+
+  const { stdout, stderr, exitCode } = await run([
+    'dom',
+    htmlPath,
+    '--css',
+    cssPath,
+    '--format',
+    'json',
+    '--output',
+    output,
+    '--json'
+  ])
+
+  expect(stderr).toBe('')
+  expect(exitCode).toBe(0)
+
+  const summary = JSON.parse(stdout)
+  expect(summary).toMatchObject({ format: 'json', output, pages: 1, rootElements: 1 })
+
+  const document = JSON.parse(await Bun.file(output).text())
+  expect(document.children[0].tagName).toBe('article')
+  expect(document.children[0].computedStyle.display).toBe('flex')
+  expect(document.children[0].computedStyle.width).toBe('240px')
+})
+
+test('dom CLI writes serialized HTML output', async () => {
+  const { htmlPath, cssPath, dir } = await createFixture()
+  const output = join(dir, 'card.out.html')
+
+  const { stderr, exitCode } = await run([
+    'dom',
+    htmlPath,
+    '--css',
+    cssPath,
+    '--format',
+    'html',
+    '--output',
+    output
+  ])
+
+  expect(stderr).toBe('')
+  expect(exitCode).toBe(0)
+
+  const html = await Bun.file(output).text()
+  expect(html).toContain('DOM/CSS card')
+  expect(html).toContain('class="card"')
+})
+
+test('dom CLI writes a .fig that core IO can import', async () => {
+  const { htmlPath, cssPath, dir } = await createFixture()
+  const output = join(dir, 'card.fig')
+
+  const { stdout, stderr, exitCode } = await run([
+    'dom',
+    htmlPath,
+    '--css',
+    cssPath,
+    '--output',
+    output,
+    '--json'
+  ])
+
+  expect(stderr).toBe('')
+  expect(exitCode).toBe(0)
+  expect(JSON.parse(stdout)).toMatchObject({ format: 'fig', output, pages: 1, rootElements: 1 })
+
+  const bytes = new Uint8Array(await Bun.file(output).arrayBuffer())
+  const graph = await parseFigFile(bytes)
+  const nodes = [...graph.nodes.values()]
+  const card = findNode(nodes, 'card')
+  const title = findNode(nodes, 'DOM/CSS card')
+
+  expect(graph.getPages()).toHaveLength(1)
+  expect(card?.type).toBe('FRAME')
+  expect(title?.type).toBe('TEXT')
+})
+
+test('dom CLI compiles Tailwind candidates before import', async () => {
+  const dir = await mkdtemp(join(tmpdir(), 'open-pencil-dom-cli-tailwind-'))
+  const htmlPath = join(dir, 'tailwind.html')
+  const output = join(dir, 'tailwind.json')
+  const classes = ['flex', 'flex-col', 'gap-2', 'w-60', 'p-6', 'rounded-xl', 'bg-white']
+
+  await Bun.write(
+    htmlPath,
+    `<article class="${classes.join(' ')}"><h1 class="text-2xl">Tailwind card</h1></article>`
+  )
+
+  const { stdout, stderr, exitCode } = await run([
+    'dom',
+    htmlPath,
+    '--tailwind',
+    classes.join(' '),
+    '--format',
+    'json',
+    '--output',
+    output,
+    '--json'
+  ])
+
+  expect(stderr).toBe('')
+  expect(exitCode).toBe(0)
+  expect(JSON.parse(stdout)).toMatchObject({ format: 'json', output })
+
+  const document = JSON.parse(await Bun.file(output).text())
+  expect(document.children[0].computedStyle.display).toBe('flex')
+  expect(document.children[0].computedStyle.width).toBe('240px')
+})