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<div class="date"> 2026-02-07 </div>
<div class="article-title"><a href="/2026/02/07/Agent-Browser/" >从 Playwright 到 agent-browser：基于 Accessibility Tree 的浏览器自动化与 AI Agent 实践</a></div>
</h3>
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<p>这篇文章整理了一次从『传统浏览器自动化测试』一路深入到『AI Agent 驱动浏览器操作』的完整思考路径，核心关键词包括 <strong>Playwright</strong>、<strong>Rust</strong>、<strong>playwright-rs</strong>、<strong>agent-browser</strong>、<strong>Accessibility Tree</strong>、<strong>LLM</strong>。如果你正在思考如何让浏览器自动化更稳、更智能，或者如何把 LLM 接进真实网页操作，这篇总结可以作为一份系统性参考。</p>
<hr>
<h2 id="一、浏览器自动化的三条路线"><a href="#一、浏览器自动化的三条路线" class="headerlink" title="一、浏览器自动化的三条路线"></a>一、浏览器自动化的三条路线</h2><p>在讨论具体工具前，先明确三种常见路线：</p>
<ol>
<li><p><strong>官方 Playwright（Node.js / Python / Java / .NET）</strong><br>工程能力最强，生态最成熟，适合严肃的 E2E 测试。</p>
</li>
<li><p><strong>Rust + Playwright</strong><br>通过 Rust bindings 调用 Playwright（如 <code>playwright-rs</code>），在 Rust 工程内完成浏览器自动化。</p>
</li>
<li><p><strong>Rust WebDriver / Selenium 生态</strong><br>标准化强，但对现代浏览器能力（自动等待、可访问性、trace）支持有限。</p>
</li>
</ol>
<p>本文重点集中在 <strong>路线 2</strong> 以及由此延伸出的 <strong>agent-browser + LLM</strong> 思路。</p>
<hr>
<h2 id="二、playwright-rs：在-Rust-中写浏览器自动化测试"><a href="#二、playwright-rs：在-Rust-中写浏览器自动化测试" class="headerlink" title="二、playwright-rs：在 Rust 中写浏览器自动化测试"></a>二、playwright-rs：在 Rust 中写浏览器自动化测试</h2><p><code>playwright-rs</code> 是目前最有前途的 Rust Playwright 绑定：</p>
<ul>
<li>基于 <strong>官方 Playwright Server（Node.js）</strong></li>
<li>Rust 侧通过 JSON-RPC 调用</li>
<li>支持 Chromium / Firefox / WebKit</li>
<li>支持 Linux / macOS / Windows</li>
<li>已在 GitHub Actions 跨平台跑通</li>
</ul>
<h3 id="一个最小的-Rust-测试用例"><a href="#一个最小的-Rust-测试用例" class="headerlink" title="一个最小的 Rust 测试用例"></a>一个最小的 Rust 测试用例</h3><figure class="highlight rust"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#[tokio::test]</span></span><br><span class="line"><span class="keyword">async</span> <span class="keyword">fn</span> <span class="title function_">smoke_test</span>() <span class="punctuation">-></span> <span class="type">Result</span><(), <span class="type">Box</span><<span class="keyword">dyn</span> std::error::Error>> {</span><br><span class="line"> <span class="keyword">let</span> <span class="variable">pw</span> = Playwright::<span class="title function_ invoke__">launch</span>().<span class="keyword">await</span>?;</span><br><span class="line"> <span class="keyword">let</span> <span class="variable">browser</span> = pw.<span class="title function_ invoke__">chromium</span>().<span class="title function_ invoke__">launch</span>().<span class="keyword">await</span>?;</span><br><span class="line"> <span class="keyword">let</span> <span class="variable">page</span> = browser.<span class="title function_ invoke__">new_page</span>().<span class="keyword">await</span>?;</span><br><span class="line"></span><br><span class="line"> page.<span class="title function_ invoke__">goto</span>(<span class="string">"https://example.com"</span>, <span class="literal">None</span>).<span class="keyword">await</span>?;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">let</span> <span class="variable">heading</span> = page.<span class="title function_ invoke__">locator</span>(<span class="string">"role=heading"</span>).<span class="keyword">await</span>;</span><br><span class="line"> <span class="built_in">assert!</span>(heading.<span class="title function_ invoke__">is_visible</span>().<span class="keyword">await</span>?);</span><br><span class="line"></span><br><span class="line"> browser.<span class="title function_ invoke__">close</span>().<span class="keyword">await</span>?;</span><br><span class="line"> <span class="title function_ invoke__">Ok</span>(())</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>关键点在于：推荐使用 role / name 等基于可访问性语义的 locator，而不是 CSS selector。</p>
<hr>
<h2 id="三、Accessibility-Tree-是什么？为什么它更稳？"><a href="#三、Accessibility-Tree-是什么？为什么它更稳？" class="headerlink" title="三、Accessibility Tree 是什么？为什么它更稳？"></a>三、Accessibility Tree 是什么？为什么它更稳？</h2><ol>
<li><p>它不是 DOM</p>
<p>Accessibility Tree 是浏览器内部为屏幕阅读器和辅助技术维护的一棵语义树：</p>
<ul>
<li>节点是 button / textbox / heading / link</li>
<li>而不是 div / span</li>
<li>包含 role、accessible name、state（disabled/checked/expanded）</li>
</ul>
<p>它由浏览器从 DOM + CSS + ARIA 自动计算生成。</p>
</li>
<li><p>为什么适合自动化与 AI ？</p>
<ul>
<li>更贴近『人类理解的页面结构』</li>
<li>对 class、布局、嵌套不敏感</li>
<li>天然支持『这个按钮叫什么』『这个输入框是干嘛的』</li>
</ul>
</li>
</ol>
<p>Playwright 原生支持基于 accessibility 的定位，这也是它明显强于 Selenium 的地方。</p>
<p>ARIA（Accessible Rich Internet Applications）是一套给 Web 元素补充『语义、名称和状态』的规范，<br>浏览器据此计算 Accessibility Tree，供辅助技术、测试工具和 AI 使用。<br>ARIA 不是 Accessibility Tree 的『开关』，而是『校准器』；没有 ARIA，浏览器也能计算出树，只是精度可能不同。</p>
<hr>
<h2 id="四、Selenium-为什么很难支持-Accessibility-Tree-？"><a href="#四、Selenium-为什么很难支持-Accessibility-Tree-？" class="headerlink" title="四、Selenium 为什么很难支持 Accessibility Tree ？"></a>四、Selenium 为什么很难支持 Accessibility Tree ？</h2><p>结论先行：<br>Selenium 短期内几乎不可能完整支持 accessibility tree。</p>
<br />
<p>原因包括：</p>
<ul>
<li>WebDriver 标准主要围绕 DOM</li>
<li>Accessibility Tree 属于浏览器内部语义模型</li>
<li>AOM（Accessibility Object Model）仍处于实验/讨论阶段</li>
<li>不同浏览器、不同操作系统的无障碍实现差异巨大</li>
</ul>
<p>因此，Selenium 通常只能：</p>
<ul>
<li>结合 axe-core 等工具做无障碍检测</li>
<li>而不是『读取并操作 accessibility tree』</li>
</ul>
<hr>
<h2 id="五、agent-browser：为-AI-Agent-设计的浏览器控制层"><a href="#五、agent-browser：为-AI-Agent-设计的浏览器控制层" class="headerlink" title="五、agent-browser：为 AI Agent 设计的浏览器控制层"></a>五、<a target="_blank" rel="noopener" href="https://github.com/vercel-labs/agent-browser">agent-browser</a>：为 AI Agent 设计的浏览器控制层</h2><ol>
<li>agent-browser 是什么<ul>
<li>Vercel Labs 出品</li>
<li>一个 Rust CLI + Playwright 后端 的工具</li>
<li>不是测试框架，而是『浏览器操作协议的 CLI 实现』</li>
</ul>
</li>
</ol>
<p>它的核心创新是：</p>
<p>snapshot + ref-id 的交互模型</p>
<hr>
<ol start="2">
<li>snapshot 的工作原理<ol>
<li>从 Playwright 读取页面的 accessibility tree</li>
<li>语义裁剪（去掉无关节点）</li>
<li>为每个节点分配稳定的引用 ID（如 @e2）</li>
<li>输出一份『当前页面可操作状态』</li>
</ol>
</li>
</ol>
<p>示例：</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">@e1 heading "Log in to Miro"</span><br><span class="line">@e2 textbox "Email"</span><br><span class="line">@e3 button "Continue"</span><br></pre></td></tr></table></figure>
<hr>
<ol start="3">
<li>用 ref-id 操作页面</li>
</ol>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">agent-browser fill @e2 <span class="string">"test@example.com"</span></span><br><span class="line">agent-browser click @e3</span><br></pre></td></tr></table></figure>
<p>完全不需要 CSS selector。</p>
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<div class=" highlight hl-bash"><pre><span></span><span class="nb">source</span><span class="w"> </span>~/.bashrc
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<p>第一步：确认你的环境前提</p>
<p>agent-browser 的现实前提有三点，缺一不可。</p>
<p>第一，macOS 本身没有问题，Intel 或 Apple Silicon 都可以。
第二，需要 <strong>Node.js（用于 Playwright）</strong>。
第三，需要 <strong>Rust（用于 agent-browser CLI）</strong>。</p>
<p>你可以先快速确认一下：</p>
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<div class=" highlight hl-bash"><pre><span></span>node<span class="w"> </span>-v
npm<span class="w"> </span>-v
rustc<span class="w"> </span>--version
cargo<span class="w"> </span>--version
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<pre>v20.19.4
10.8.2
rustc 1.58.1 (db9d1b20b 2022-01-20)
cargo 1.58.0 (f01b232bc 2022-01-19)
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<p>如果 Node 没装，建议直接用：</p>
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<div class=" highlight hl-bash"><pre><span></span>brew<span class="w"> </span>install<span class="w"> </span>node
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<div class=" highlight hl-bash"><pre><span></span>pnpm<span class="w"> </span>setup
pnpm<span class="w"> </span>config<span class="w"> </span>get<span class="w"> </span>global-dir
mkdir<span class="w"> </span>-p<span class="w"> </span>~/.pnpm-global
pnpm<span class="w"> </span>config<span class="w"> </span><span class="nb">set</span><span class="w"> </span>global-dir<span class="w"> </span>~/.pnpm-global
<span class="nb">source</span><span class="w"> </span>~/.zshrc
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<p>如果 Rust 没装：</p>
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<div class=" highlight hl-bash"><pre><span></span>curl<span class="w"> </span>--proto<span class="w"> </span><span class="s1">'=https'</span><span class="w"> </span>--tlsv1.2<span class="w"> </span>-sSf<span class="w"> </span>https://sh.rustup.rs<span class="w"> </span><span class="p">|</span><span class="w"> </span>sh
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<div class=" highlight hl-bash"><pre><span></span>rustup<span class="w"> </span>update<span class="w"> </span>stable
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<p>或者：</p>
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<div class=" highlight hl-bash"><pre><span></span>curl<span class="w"> </span>--proto<span class="w"> </span><span class="s1">'=https'</span><span class="w"> </span>--tlsv1.2<span class="w"> </span>-sSf<span class="w"> </span>https://sh.rustup.rs<span class="w"> </span><span class="p">|</span><span class="w"> </span>sh<span class="w"> </span>-s<span class="w"> </span>--<span class="w"> </span>-y<span class="w"> </span>--profile<span class="w"> </span>minimal
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<div class=" highlight hl-bash"><pre><span></span>rustup<span class="w"> </span>update<span class="w"> </span>stable
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<p>装完记得重新开一个 shell，确保 <code>cargo</code> 在 PATH 里。</p>
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<p>第二步：安装 Playwright（这是最容易被忽略的一步）</p>
<p>agent-browser <strong>不是直接控制浏览器</strong>，它底层仍然依赖 Playwright 的 browser binaries。</p>
<p>在一个干净目录里执行一次即可：</p>
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<div class=" highlight hl-bash"><pre><span></span>npx<span class="w"> </span>playwright<span class="w"> </span>install
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<p>或者：</p>
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<div class=" highlight hl-bash"><pre><span></span>npm<span class="w"> </span>install<span class="w"> </span>-g<span class="w"> </span>playwright@latest
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<div class=" highlight hl-bash"><pre><span></span>playwright<span class="w"> </span>--version
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<pre>Version 1.58.2
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<p>这一步会下载 Chromium / Firefox / WebKit。
macOS 上第一次运行浏览器时，系统可能会弹出『安全性与隐私』提示，允许即可。</p>
<p>如果这一步没做，后面 agent-browser 会『能启动，但打不开页面』。</p>
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<p>第三步：安装 agent-browser CLI</p>
<p>现在开始真正的 agent-browser。</p>
<p>官方仓库是：</p>
<p><a target="_blank" rel="noopener" href="https://github.com/vercel-labs/agent-browser">https://github.com/vercel-labs/agent-browser</a></p>
<p>最直接、最稳妥的方式是 <strong>从源码安装</strong>：</p>
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<div class=" highlight hl-bash"><pre><span></span>git<span class="w"> </span>clone<span class="w"> </span>https://github.com/vercel-labs/agent-browser.git
<span class="nb">cd</span><span class="w"> </span>agent-browser
pnpm<span class="w"> </span>install
pnpm<span class="w"> </span>build
pnpm<span class="w"> </span>build:native<span class="w"> </span><span class="c1"># Requires Rust (https://rustup.rs)</span>
pnpm<span class="w"> </span>link<span class="w"> </span>--global<span class="w"> </span><span class="c1"># Makes agent-browser available globally</span>
agent-browser<span class="w"> </span>install
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<p>安装成功后，你应该能看到：</p>
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<pre>
agent-browser - fast browser automation CLI for AI agents
Usage: agent-browser <command> [args] [options]
Core Commands:
open <url> Navigate to URL
click <sel> Click element (or @ref)
dblclick <sel> Double-click element
type <sel> <text> Type into element
fill <sel> <text> Clear and fill
press <key> Press key (Enter, Tab, Control+a)
hover <sel> Hover element
focus <sel> Focus element
check <sel> Check checkbox
uncheck <sel> Uncheck checkbox
select <sel> <val...> Select dropdown option
drag <src> <dst> Drag and drop
upload <sel> <files...> Upload files
download <sel> <path> Download file by clicking element
scroll <dir> [px] Scroll (up/down/left/right)
scrollintoview <sel> Scroll element into view
wait <sel|ms> Wait for element or time
screenshot [path] Take screenshot
pdf <path> Save as PDF
snapshot Accessibility tree with refs (for AI)
eval <js> Run JavaScript
connect <port|url> Connect to browser via CDP
close Close browser
Navigation:
back Go back
forward Go forward
reload Reload page
Get Info: agent-browser get <what> [selector]
text, html, value, attr <name>, title, url, count, box, styles
Check State: agent-browser is <what> <selector>
visible, enabled, checked
Find Elements: agent-browser find <locator> <value> <action> [text]
role, text, label, placeholder, alt, title, testid, first, last, nth
Mouse: agent-browser mouse <action> [args]
move <x> <y>, down [btn], up [btn], wheel <dy> [dx]
Browser Settings: agent-browser set <setting> [value]
viewport <w> <h>, device <name>, geo <lat> <lng>
offline [on|off], headers <json>, credentials <user> <pass>
media [dark|light] [reduced-motion]
Network: agent-browser network <action>
route <url> [--abort|--body <json>]
unroute [url]
requests [--clear] [--filter <pattern>]
Storage:
cookies [get|set|clear] Manage cookies (set supports --url, --domain, --path, --httpOnly, --secure, --sameSite, --expires)
storage <local|session> Manage web storage
Tabs:
tab [new|list|close|<n>] Manage tabs
Debug:
trace start|stop [path] Record trace
record start <path> [url] Start video recording (WebM)
record stop Stop and save video
console [--clear] View console logs
errors [--clear] View page errors
highlight <sel> Highlight element
Sessions:
session Show current session name
session list List active sessions
Setup:
install Install browser binaries
install --with-deps Also install system dependencies (Linux)
Snapshot Options:
-i, --interactive Only interactive elements
-c, --compact Remove empty structural elements
-d, --depth <n> Limit tree depth
-s, --selector <sel> Scope to CSS selector
Options:
--session <name> Isolated session (or AGENT_BROWSER_SESSION env)
--profile <path> Persistent browser profile (or AGENT_BROWSER_PROFILE env)
--state <path> Load storage state from JSON file (or AGENT_BROWSER_STATE env)
--headers <json> HTTP headers scoped to URL's origin (for auth)
--executable-path <path> Custom browser executable (or AGENT_BROWSER_EXECUTABLE_PATH)
--extension <path> Load browser extensions (repeatable)
--args <args> Browser launch args, comma or newline separated (or AGENT_BROWSER_ARGS)
e.g., --args "--no-sandbox,--disable-blink-features=AutomationControlled"
--user-agent <ua> Custom User-Agent (or AGENT_BROWSER_USER_AGENT)
--proxy <server> Proxy server URL (or AGENT_BROWSER_PROXY)
e.g., --proxy "http://user:pass@127.0.0.1:7890"
--proxy-bypass <hosts> Bypass proxy for these hosts (or AGENT_BROWSER_PROXY_BYPASS)
e.g., --proxy-bypass "localhost,*.internal.com"
--ignore-https-errors Ignore HTTPS certificate errors
--allow-file-access Allow file:// URLs to access local files (Chromium only)
-p, --provider <name> Browser provider: ios, browserbase, kernel, browseruse
--device <name> iOS device name (e.g., "iPhone 15 Pro")
--json JSON output
--full, -f Full page screenshot
--headed Show browser window (not headless)
--cdp <port> Connect via CDP (Chrome DevTools Protocol)
--debug Debug output
--version, -V Show version
Environment:
AGENT_BROWSER_SESSION Session name (default: "default")
AGENT_BROWSER_EXECUTABLE_PATH Custom browser executable path
AGENT_BROWSER_PROVIDER Browser provider (ios, browserbase, kernel, browseruse)
AGENT_BROWSER_STREAM_PORT Enable WebSocket streaming on port (e.g., 9223)
AGENT_BROWSER_IOS_DEVICE Default iOS device name
AGENT_BROWSER_IOS_UDID Default iOS device UDID
Examples:
agent-browser open example.com
agent-browser snapshot -i # Interactive elements only
agent-browser click @e2 # Click by ref from snapshot
agent-browser fill @e3 "test@example.com"
agent-browser find role button click --name Submit
agent-browser get text @e1
agent-browser screenshot --full
agent-browser --cdp 9222 snapshot # Connect via CDP port
agent-browser --profile ~/.myapp open example.com # Persistent profile
iOS Simulator (requires Xcode and Appium):
agent-browser -p ios open example.com # Use default iPhone
agent-browser -p ios --device "iPhone 15 Pro" open url # Specific device
agent-browser -p ios device list # List simulators
agent-browser -p ios swipe up # Swipe gesture
agent-browser -p ios tap @e1 # Touch element
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<p>如果提示 command not found，检查 <code>$HOME/.cargo/bin</code> 是否在 PATH 中。</p>
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<p>第四步：做一次最小可行测试（不接 LLM）</p>
<p>不要一上来就连 LLM，先验证三件事：</p>
<ol>
<li>Playwright 能起浏览器</li>
<li>agent-browser 能读 accessibility tree</li>
<li>snapshot 能正常输出</li>
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<p>按顺序来：</p>
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<div class=" highlight hl-bash"><pre><span></span>agent-browser<span class="w"> </span>open<span class="w"> </span>https://miro.com/login/<span class="w"> </span>--headed
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<pre><span class="ansi-green-fg">✓</span> <span class="ansi-bold">Sign in | Miro | The Visual Workspace for Innovation</span>
https://miro.com/login/
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<p>你应该能看到浏览器窗口被打开。</p>
<p>接着：</p>
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<pre>- document:
- button "Skip to main content" [ref=e1]
- banner:
- link "Go to Miro main page" [ref=e2]:
- /url: /index/
- text: Miro Logo
- button "Language" [ref=e3]: en
- text: "Current language is: English"
- link "Sign up" [ref=e4]:
- /url: https://miro.com/signup/
- main:
- heading "Sign in to Miro" [ref=e5] [level=1]
- group "Sign-in options":
- button "SSO" [ref=e6]
- button "Google" [ref=e7]
- button "Microsoft 365" [ref=e8]
- button "Show more sign-in options" [ref=e9]
- text: Email
- textbox "Email" [ref=e10]:
- /placeholder: Enter your email address
- text: Password
- textbox "Password" [ref=e11]:
- /placeholder: Enter your password
- link "Forgot password?" [ref=e12]:
- /url: https://miro.com/recover/
- checkbox "Remember me" [ref=e13] [checked]
- paragraph:
- paragraph: Remember me
- button "Continue with email" [ref=e14]
- button "Sign in to a different region or a private organization" [ref=e15]
- paragraph:
- text: Trouble signing in?
- link "Request a magic sign in link" [ref=e16]:
- /url: /login/passwordless/
- text: or
- link "reset your password" [ref=e17]:
- /url: /recover/
- text: .
- alert
- iframe
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<p>正常情况下，会输出类似：</p>
<pre><code>@e1 heading "Example Domain"
@e2 paragraph "This domain is for use in illustrative examples..."
@e3 link "More information..."
</code></pre>
<p>只要这一步成功，说明你的 <strong>macOS + Playwright + agent-browser 环境是健康的</strong>。</p>
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<p>第五步：实际操作页面（验证 ref-id 模型）</p>
<p>继续在 example.com 上试：</p>
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<div class=" highlight hl-bash"><pre><span></span>agent-browser<span class="w"> </span>click<span class="w"> </span>@e22
agent-browser<span class="w"> </span>snapshot
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<p>你会看到页面发生变化，ref-id 全部重新分配。
这一步非常关键，它验证了你对 agent-browser 核心原则的理解：</p>
<blockquote>
<p>ref-id 只在当前 snapshot 有意义</p>
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<div class=" highlight hl-bash"><pre><span></span>agent-browser<span class="w"> </span>click<span class="w"> </span>@e4
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<div class=" highlight hl-bash"><pre><span></span>agent-browser<span class="w"> </span>fill<span class="w"> </span>@e6<span class="w"> </span><span class="s2">"andy@dtype.info"</span>
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<p>第六步：测试一个真实复杂页面（推荐）</p>
<p>不要立刻上 Miro、Google 这种登录页，先选一个『复杂但不反爬』的页面，比如：</p>
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<div class=" highlight hl-bash"><pre><span></span>agent-browser<span class="w"> </span>open<span class="w"> </span>https://news.ycombinator.com
agent-browser<span class="w"> </span>snapshot
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<p>你会看到大量：</p>
<pre><code>@e1 link "Hacker News"
@e2 link "new"
@e3 link "past"
...
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<p>试着：</p>
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<div class=" highlight hl-bash"><pre><span></span>agent-browser<span class="w"> </span>click<span class="w"> </span>@e2
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