playwright-scraper

name

playwright-scraper

description

Build a Playwright walkthrough script that signs into a web app, walks every step, fills forms with sensible defaults, answers Yes/No wizards, takes a numbered screenshot at each step, and produces an HTML gallery + composite PNG. Use when the user asks to "walk through" a URL with Playwright, "screenshot every step" of an app, "scrape" a Lovable/v0/Bolt/Streamlit prototype, generate UI documentation, capture a flow for design review, or build a regression baseline of an app's UI.

Playwright walkthrough builder

You are about to write a Playwright script that walks through a web app the user gave you and produces a labeled screenshot gallery.

This skill ships with a helper library at playwright_scraper (see the repo at https://github.com/ChakshuGautam/playwright-scraper). Prefer using it over re-implementing — the helpers were tuned against real prototypes (Lovable apps in particular) and handle the edge cases listed below.

Required output

Always produce three artifacts in an output directory:

1. Numbered screenshots — 01_signin_blank.png, 02_signin_filled.png, ... one per step
2. index.html — a click-to-zoom gallery
3. _graph_all.png — a single composite PNG of every screenshot

The user wants to see the flow without re-running anything, so the gallery is the deliverable, not the script.

How to write the script

import asyncio
from playwright.async_api import async_playwright
from playwright_scraper import Walker

OUT = "output"
URL = "https://example.com/"

async def main():
    async with async_playwright() as p:
        browser = await p.chromium.launch(headless=True)
        ctx = await browser.new_context(viewport={"width": 1440, "height": 900})
        page = await ctx.new_page()
        page.on("pageerror", lambda exc: print(f"[pageerror] {exc}"))

        w = Walker(page, OUT)

        # 1. Initial load
        await page.goto(URL, wait_until="networkidle", timeout=60000)
        await page.wait_for_timeout(1500)
        await w.shot("landing")

        # 2. Auth (if any) — fill explicitly, never guess passwords with smart_fill
        # ...

        # 3. Generic walk through the rest of the flow
        previous_text = ""
        for i in range(20):
            await w.smart_fill()              # text inputs
            await w.pick_first_radio_in_each_group()
            await w.check_consents()
            await w.answer_yesno("No")        # binary wizard questions
            await w.shot(f"step_{i:02d}_filled")

            clicked = await w.click_forward()
            if not clicked:
                await w.shot(f"step_{i:02d}_final")
                break
            await page.wait_for_timeout(2500)
            await w.shot(f"step_{i:02d}_after_{clicked.lower().replace(' ', '_')}")

            cur_text = (await w.page_text())[:500]
            if cur_text == previous_text:
                break
            previous_text = cur_text

        w.build_gallery(title="example.com walkthrough")
        await browser.close()

asyncio.run(main())

Patterns the helpers already know

Walker.shot(label) — saves NN_<label>.png and a sibling .txt with the page's innerText (extremely useful for debugging: when something goes wrong, read the .txt rather than re-running).

Walker.smart_fill() — fills every empty visible <input> / <textarea> with a sensible default based on its placeholder / name / id / aria-label. Knows about: email, phone, name (first/last/full/business), address, city/state/country, PIN/GST/PAN/Aadhaar, dept, fee, SLA, description, code/slug, and more. Pass overrides={"workspace": "GOI"} to override values by hint-substring match.

Walker.answer_yesno(choice="No") — finds every Yes/No button pair on the page (grouped by parent element) and clicks the chosen side. Wizards with multiple questions per step need ALL answered before "Continue" enables.

Walker.click_forward() — tries every reasonable forward-progress label: Continue, Next, Submit, Save and continue, Confirm, Finish, Done, Publish, Launch, Create, Apply, Start Application, etc. Returns the label clicked or None.

Walker.build_gallery(title=...) — emits index.html and _graph_all.png from the saved screenshots.

Pitfalls to avoid (learned the hard way)

1. Don't smart-fill password fields. smart_fill already skips them. For sign-in, fill #password (or whatever selector) directly with the user-provided value. For "reset password" steps, ALSO fill explicitly — using a generic default will fail validation with "Current password is incorrect."

2. Wizards with many Y/N questions per step. A single step may have 3 separate questions; "Continue" stays disabled until all are answered. Call answer_yesno and check it returned > 0 — if so, look at the page again, more might have appeared. Repeat up to a few times.

3. State-machine wizards keep the same URL. Many SPA wizards mutate state without changing the URL. Don't rely on URL change to detect "we moved forward" — compare page text (page_text() first 300-500 chars) before vs after.

4. Look at the page after the first failed click_forward. When forward returns None, the screenshot of the current state will tell you why (a Yes/No you missed, an unchecked consent, an invalid email). Don't just retry — look.

5. Phone-frame previews are NOT mobile viewports. Lovable-style apps often embed a citizen view inside a phone-mockup at desktop viewport. Don't switch to a mobile device profile — the app already renders both frames inside one desktop page. Look for desktop-frame toggle buttons (icons named monitor/laptop) to switch.

6. Common forward labels you'll miss without click_forward: "Start Application", "Use template", "Go Live", "Publish", "Choose Template". The helper's default list includes these.

7. Tab clicks via :text-is('Foo') can accidentally match anything containing 'Foo'. Use get_by_role("tab", name="Foo") first; fall back to :text-is. Some UI library "tabs" are really <button> — try both.

8. The .txt sidecar from shot() is your friend. Reading the rendered body text after each step is faster than re-running with --headed. When the script hits a wall, grep -l 'Continue' output/*.txt shows which steps still had a Continue button.

9. Avoid mocking the auth. If sign-in is "anything@anything + temp password", just fill realistic values rather than trying to bypass.

10. Run with headless=True by default. The user almost always wants the gallery, not to watch the browser. Only flip headed if you're actively debugging.

Workflow when the user gives you a URL

1. Reconnaissance pass first. Write a 20-line script that just loads the page and dumps controls (inputs + buttons + their text/placeholders). Read that output before writing the full walkthrough.
2. Identify auth. Ask the user for credentials if they aren't obvious. For prototypes ("temp password 12345678" is common), try the password they gave with a placeholder email like [e-mail].
3. Write the walkthrough. Hand-code the first 2-3 known steps (auth + first nav), then loop with smart_fill + click_forward for the rest.
4. Run, inspect the gallery, fix gaps. If the script gets stuck at step N, open NN_*.txt, figure out what the page wants, adjust, re-run.
5. Tour every sidebar/nav route too. Once authenticated, iterate over every link in the navigation and screenshot each page — this catches hidden features the linear walkthrough misses.
6. Build the gallery and tell the user where to view it.

What the deliverable looks like

The user gets a folder they can cd into and open index.html. Each screenshot has a one-line caption derived from the filename. The composite PNG lets them see the whole flow on one screen.

If the user also has a static hosting setup (e.g. an nginx wildcard like *.proto.example.com), offer to drop the folder into /var/www/<slug>/, add an nginx block, and provision a Let's Encrypt cert. The gallery is just static HTML+PNG.