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179 | #!/usr/bin/env python3
"""
Design-forensics capture.
Renders a live website (JS included) and pulls down everything you need to
study or rebuild its DESIGN — not its data:
- full-page screenshots at desktop + mobile breakpoints
- the fully-rendered HTML (post-JS DOM)
- the raw <link> stylesheets
- a ranked design-token report: fonts, colors, font sizes/weights,
spacing scale, radii — each ordered by how often it actually appears
Usage:
python capture.py <url> [name]
Example:
python capture.py https://cofounder.co cofounder
Output lands in ./captures/<name>/
"""
import sys, os, json, re, urllib.parse, urllib.request
from collections import Counter
from playwright.sync_api import sync_playwright
DESKTOP = {"width": 1440, "height": 900}
MOBILE = {"width": 390, "height": 844}
# JS that walks the rendered DOM and tallies the computed design tokens.
EXTRACT_JS = r"""
() => {
const tally = {
fontFamily: {}, fontSize: {}, fontWeight: {},
color: {}, background: {}, letterSpacing: {},
lineHeight: {}, radius: {}, spacing: {}
};
const bump = (bucket, key) => {
if (!key || key === 'normal' || key === 'none' || key === 'auto') return;
bucket[key] = (bucket[key] || 0) + 1;
};
const isVisibleColor = (c) =>
c && c !== 'rgba(0, 0, 0, 0)' && c !== 'transparent';
for (const el of document.querySelectorAll('*')) {
const s = getComputedStyle(el);
const txt = (el.textContent || '').trim().length > 0;
bump(tally.fontFamily, s.fontFamily);
if (txt) {
bump(tally.fontSize, s.fontSize);
bump(tally.fontWeight, s.fontWeight);
bump(tally.lineHeight, s.lineHeight);
bump(tally.letterSpacing, s.letterSpacing);
if (isVisibleColor(s.color)) bump(tally.color, s.color);
}
if (isVisibleColor(s.backgroundColor)) bump(tally.background, s.backgroundColor);
bump(tally.radius, s.borderRadius);
for (const side of ['marginTop','marginBottom','paddingTop','paddingBottom','gap']) {
bump(tally.spacing, s[side]);
}
}
// Also grab the declared @font-face / font links and CSS custom props on :root
const rootVars = {};
const rs = getComputedStyle(document.documentElement);
for (const name of rs) {
if (name.startsWith('--')) rootVars[name] = rs.getPropertyValue(name).trim();
}
const stylesheets = [...document.querySelectorAll('link[rel="stylesheet"]')].map(l => l.href);
const fonts = [...document.querySelectorAll('link[href*="font"], link[href*="Font"]')].map(l => l.href);
return { tally, rootVars, stylesheets, fonts,
title: document.title, url: location.href };
}
"""
def rank(d, top=15):
return [{"value": k, "count": v} for k, v in
sorted(d.items(), key=lambda kv: -kv[1])[:top]]
def md_table(title, items):
rows = "\n".join(f"| `{i['value']}` | {i['count']} |" for i in items)
return f"### {title}\n\n| value | uses |\n|---|---|\n{rows}\n"
def main():
if len(sys.argv) < 2:
print(__doc__); sys.exit(1)
url = sys.argv[1]
name = sys.argv[2] if len(sys.argv) > 2 else \
urllib.parse.urlparse(url).netloc.replace("www.", "").split(".")[0]
outdir = os.path.join(os.path.dirname(os.path.abspath(__file__)), "captures", name)
os.makedirs(outdir, exist_ok=True)
print(f"→ capturing {url}\n→ output: {outdir}")
with sync_playwright() as p:
browser = p.chromium.launch()
ctx = browser.new_context(viewport=DESKTOP, device_scale_factor=2,
user_agent=("Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) "
"AppleWebKit/537.36 (KHTML, like Gecko) "
"Chrome/148.0 Safari/537.36"))
page = ctx.new_page()
page.goto(url, wait_until="networkidle", timeout=60000)
page.wait_for_timeout(1500) # let lazy/animated content settle
# rendered HTML
html = page.content()
with open(os.path.join(outdir, "rendered.html"), "w") as f:
f.write(html)
# desktop screenshot
page.screenshot(path=os.path.join(outdir, "desktop-full.png"), full_page=True)
# design tokens
data = page.evaluate(EXTRACT_JS)
# mobile screenshot
page.set_viewport_size(MOBILE)
page.wait_for_timeout(800)
page.screenshot(path=os.path.join(outdir, "mobile-full.png"), full_page=True)
browser.close()
# rank + write tokens.json
t = data["tally"]
tokens = {
"title": data["title"], "url": data["url"],
"rootVars": data["rootVars"],
"stylesheets": data["stylesheets"],
"fontLinks": data["fonts"],
"fonts": rank(t["fontFamily"]),
"colors": rank(t["color"]),
"backgrounds": rank(t["background"]),
"fontSizes": rank(t["fontSize"]),
"fontWeights": rank(t["fontWeight"]),
"lineHeights": rank(t["lineHeight"]),
"letterSpacing": rank(t["letterSpacing"]),
"radii": rank(t["radius"]),
"spacing": rank(t["spacing"], top=20),
}
with open(os.path.join(outdir, "tokens.json"), "w") as f:
json.dump(tokens, f, indent=2)
# download linked stylesheets
cssdir = os.path.join(outdir, "css")
os.makedirs(cssdir, exist_ok=True)
saved = 0
for i, href in enumerate(data["stylesheets"][:20]):
try:
req = urllib.request.Request(href, headers={"User-Agent": "Mozilla/5.0"})
css = urllib.request.urlopen(req, timeout=15).read()
fn = re.sub(r"[^a-zA-Z0-9_.-]", "_", urllib.parse.urlparse(href).path.split("/")[-1] or f"sheet{i}")
if not fn.endswith(".css"): fn += ".css"
with open(os.path.join(cssdir, f"{i:02d}_{fn}"), "wb") as f:
f.write(css)
saved += 1
except Exception as e:
print(f" ! css fetch failed {href}: {e}")
# human-readable report
report = [f"# Design forensics — {tokens['title']}", f"`{tokens['url']}`\n",
"Screenshots: `desktop-full.png`, `mobile-full.png` · "
"Rendered DOM: `rendered.html` · "
f"Stylesheets saved: {saved} in `css/`\n"]
if tokens["rootVars"]:
report.append("### CSS custom properties (:root)\n")
for k, v in list(tokens["rootVars"].items())[:40]:
report.append(f"- `{k}`: `{v}`")
report.append("")
report.append(md_table("Font families", tokens["fonts"]))
report.append(md_table("Text colors", tokens["colors"]))
report.append(md_table("Background colors", tokens["backgrounds"]))
report.append(md_table("Font sizes", tokens["fontSizes"]))
report.append(md_table("Font weights", tokens["fontWeights"]))
report.append(md_table("Spacing scale", tokens["spacing"]))
report.append(md_table("Border radii", tokens["radii"]))
with open(os.path.join(outdir, "REPORT.md"), "w") as f:
f.write("\n".join(report))
print(f"✓ done — {outdir}")
print(f" screenshots, rendered.html, tokens.json, REPORT.md, {saved} stylesheets")
if __name__ == "__main__":
main()
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