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import { afterAll, beforeAll, describe, expect, it } from "vitest";
import puppeteer, { type Browser, type Page } from "puppeteer";
import {
createObserverScript,
createExtractorScript,
flattenSemanticTree,
formatSemanticTreeText,
summarizeSemanticTree,
type AgentHandoff,
type SemanticNode,
} from "../src/index";
let browser: Browser;
let page: Page;
beforeAll(async () => {
browser = await puppeteer.launch({ headless: true });
page = await browser.newPage();
});
afterAll(async () => {
await browser?.close();
});
describe("extractSemanticTree", () => {
it("exports the agent handoff type from the public entry", () => {
const handoff: Pick<AgentHandoff, "decision" | "mode" | "operation" | "instruction"> = {
decision: "return",
mode: "read",
operation: "return",
instruction: "Answer now.",
};
expect(handoff.decision).toBe("return");
});
it("extracts headings, form controls, names, and state", async () => {
await page.setContent(`
<main>
<h1>Checkout</h1>
<label for="email">Email address</label>
<input id="email" type="email" required placeholder="you@example.com" />
<button aria-pressed="true">Continue</button>
<a href="/terms">Terms</a>
</main>
`);
const tree = await extract(page);
const flat = flattenSemanticTree(tree);
const namedRoles = summarizeSemanticTree(tree).namedRoles;
expect(namedRoles).toContain("heading:Checkout");
expect(namedRoles).toContain("textbox:Email address");
expect(namedRoles).toContain("button:Continue");
expect(namedRoles).toContain("link:Terms");
expect(flat.find((node) => node.role === "textbox")?.state?.required).toBe(true);
expect(flat.find((node) => node.role === "button")?.state?.pressed).toBe(true);
});
it("extracts ARIA state values that need option-aware normalization", async () => {
await page.setContent(`
<main>
<button aria-controls="results" aria-live="polite" aria-valuetext="Ready">Run report</button>
</main>
`);
const tree = await extract(page);
const button = flattenSemanticTree(tree).find((node) => node.role === "button");
expect(button?.state).toMatchObject({
controls: "results",
live: "polite",
valueText: "Ready",
});
});
it("prunes hidden content and keeps aria-labelled controls", async () => {
await page.setContent(`
<section>
<h2 id="search-title">Search docs</h2>
<input aria-labelledby="search-title" />
<button style="display:none">Hidden button</button>
<button aria-hidden="true">Also hidden</button>
<button style="opacity:0">Transparent button</button>
</section>
`);
const tree = await extract(page);
const text = formatSemanticTreeText(tree);
expect(text).toContain("textbox 'Search docs'");
expect(text).not.toContain("Hidden button");
expect(text).not.toContain("Also hidden");
expect(text).not.toContain("Transparent button");
});
it("unrolls select options", async () => {
await page.setContent(`
<label for="car">Choose a car</label>
<select id="car">
<option value="volvo">Volvo</option>
<option value="audi" selected>Audi</option>
</select>
`);
const tree = await extract(page);
const flat = flattenSemanticTree(tree);
const options = flat.filter((node) => node.role === "option");
expect(flat.find((node) => node.role === "combobox")?.name).toBe("Choose a car");
expect(options.map((node) => node.name)).toEqual(expect.arrayContaining(["Volvo", "Audi"]));
expect(options.find((node) => node.name === "Audi")?.state?.selected).toBe(true);
});
it("can keep select controls compact without option unrolling", async () => {
await page.setContent(`
<label for="language">Language</label>
<select id="language">
<option value="en">English</option>
<option value="ko">Korean</option>
</select>
`);
const tree = (await page.evaluate(
createExtractorScript({ mode: "compact", includeBounds: false, includeSelectOptions: false }),
)) as SemanticNode;
const flat = flattenSemanticTree(tree);
expect(flat.find((node) => node.role === "combobox")?.name).toBe("Language");
expect(flat.filter((node) => node.role === "option")).toHaveLength(0);
});
it("prunes custom element wrappers that only contain semantic descendants", async () => {
await page.setContent(`
<main>
<mdn-button>
<button>Save</button>
</mdn-button>
</main>
`);
const tree = await extract(page);
const flat = flattenSemanticTree(tree);
expect(flat.find((node) => node.tag === "mdn-button")).toBeUndefined();
expect(flat.find((node) => node.role === "button")?.name).toBe("Save");
});
it("does not name structural landmarks from all descendant text", async () => {
await page.setContent(`
<main>
<h1>Article title</h1>
<p>Long article body that should not become the main landmark name.</p>
</main>
<ul>
<li><a href="/a">First link</a></li>
</ul>
`);
const tree = await extract(page);
const flat = flattenSemanticTree(tree);
expect(flat.find((node) => node.role === "main")?.name).toBe("");
expect(flat.find((node) => node.role === "list")?.name).toBe("");
expect(flat.find((node) => node.role === "listitem")?.name).toBe("");
expect(flat.find((node) => node.role === "heading")?.name).toBe("Article title");
expect(flat.find((node) => node.role === "link")?.name).toBe("First link");
});
it("uses link contents before title fallback for accessible names", async () => {
await page.setContent(`
<a href="/en" title="English — Wikipedia — The Free Encyclopedia">
English <small>7,189,000+ articles</small>
</a>
<a href="/empty" title="Fallback title"></a>
`);
const tree = await extract(page);
const links = flattenSemanticTree(tree).filter((node) => node.role === "link");
expect(links[0]?.name).toBe("English 7,189,000+ articles");
expect(links[1]?.name).toBe("Fallback title");
});
it("only exposes section and form landmarks when they have explicit names", async () => {
await page.setContent(`
<section>
<h2>Unnamed section</h2>
</section>
<section aria-label="Named section">
<p>Body</p>
</section>
<form>
<button>Unnamed form button</button>
</form>
<form aria-label="Search">
<button>Search</button>
</form>
`);
const tree = await extract(page);
const namedRoles = summarizeSemanticTree(tree).namedRoles;
expect(namedRoles).toContain("region:Named section");
expect(namedRoles).toContain("form:Search");
expect(namedRoles).not.toContain("region:Unnamed section");
expect(namedRoles).not.toContain("form:Unnamed form button");
});
it("can exclude likely ad placements when requested", async () => {
await page.setContent(`
<main>
<a class="ad" href="/ad">Ad</a>
<a href="/real">Real link</a>
</main>
`);
const tree = (await page.evaluate(
createExtractorScript({ mode: "compact", includeBounds: false, excludeLikelyAds: true }),
)) as SemanticNode;
const namedRoles = summarizeSemanticTree(tree).namedRoles;
expect(namedRoles).toContain("link:Real link");
expect(namedRoles).not.toContain("link:Ad");
});
it("extracts table cell names for layout-table comparison", async () => {
await page.setContent(`
<table>
<tbody>
<tr>
<td><a href="/news">Story title</a></td>
<td>12 comments</td>
</tr>
</tbody>
</table>
`);
const tree = await extract(page);
const namedRoles = summarizeSemanticTree(tree).namedRoles;
expect(namedRoles).toContain("cell:Story title");
expect(namedRoles).toContain("cell:12 comments");
expect(namedRoles).toContain("link:Story title");
});
it("extracts semantic children from open shadow roots", async () => {
await page.setContent(`<main><x-card></x-card></main>`);
await page.evaluate(() => {
const host = document.querySelector("x-card");
const shadow = host?.attachShadow({ mode: "open" });
if (shadow) shadow.innerHTML = `<button>Shadow action</button>`;
});
const tree = await extract(page);
const namedRoles = summarizeSemanticTree(tree).namedRoles;
expect(namedRoles).toContain("button:Shadow action");
});
it("extracts semantic children from same-origin iframes", async () => {
await page.setContent(`
<main>
<iframe srcdoc="<button>Frame action</button>"></iframe>
</main>
`);
await page.waitForFunction(() => {
const iframe = document.querySelector("iframe");
return iframe?.contentDocument?.body?.querySelector("button");
});
const tree = await extract(page);
const namedRoles = summarizeSemanticTree(tree).namedRoles;
expect(namedRoles).toContain("button:Frame action");
});
it("marks cross-origin iframes as unavailable placeholders", async () => {
await page.setContent(`
<main>
<iframe title="Remote frame" src="https://example.com"></iframe>
</main>
`);
const tree = await extract(page);
const iframePlaceholder = flattenSemanticTree(tree).find((node) =>
node.tag === "iframe" && Boolean(node.unavailableReason)
);
expect(iframePlaceholder?.tag).toBe("iframe");
});
it("streams semantic tree changes from DOM mutations", async () => {
await page.setContent(`<main id="root"></main>`);
await page.evaluate(() => {
(window as unknown as { __changes: unknown[] }).__changes = [];
window.addEventListener("__AX_LITE_OBSERVER__:change", (event) => {
(window as unknown as { __changes: unknown[] }).__changes.push((event as CustomEvent).detail);
});
});
await page.evaluate(createObserverScript({ debounceMs: 10, includeBounds: false }));
await page.evaluate(() => {
const button = document.createElement("button");
button.textContent = "Later action";
document.getElementById("root")?.append(button);
});
await page.waitForFunction(() => (window as unknown as { __changes: unknown[] }).__changes.length > 0);
const change = await page.evaluate(() => {
return (window as unknown as { __changes: Array<{ tree: SemanticNode; mutationCount: number }> }).__changes[0];
});
if (!change) throw new Error("Expected a semantic tree mutation change");
const namedRoles = summarizeSemanticTree(change.tree).namedRoles;
expect(change.mutationCount).toBeGreaterThan(0);
expect(namedRoles).toContain("button:Later action");
});
it("supports text output mode for prompt-sized inspection", async () => {
await page.setContent(`
<main>
<h1>Example</h1>
<button>Run</button>
</main>
`);
const text = await page.evaluate(createExtractorScript({ format: "text", mode: "compact" }));
expect(text).toContain("heading 'Example'");
expect(text).toContain("[i] button 'Run'");
});
});
async function extract(page: Page): Promise<SemanticNode> {
return (await page.evaluate(createExtractorScript({ mode: "compact", includeBounds: false }))) as Sem
2EBF
anticNode;
}