How to Run Playwright on AWS Lambda with Docker and Xvfb
Package Playwright in a Lambda container, choose headless or Xvfb, test locally, deploy to ECR, and troubleshoot browser failures.
Engineering
Puppeteer, Playwright, Selenium and headless Chrome, and what they take to run well.
How to Generate an Image From the DOM in Node.js
Use Puppeteer or Playwright to render a real DOM in Node.js, capture pages or elements, and avoid jsdom rendering traps.
Where Selenium’s getScreenshotAs Method Is Defined and How It Works
Learn where Selenium's getScreenshotAs method is declared, how WebDriver captures images, which OutputType to choose, and how to handle common failures.
How to Run Playwright Projects in Parallel
Run Playwright browser projects faster with workers, dependencies, fully parallel tests, and CI sharding. Includes configuration, isolation, and troubleshooting.
Why html2canvas Does Not Apply CSS Styles and How to Fix It
html2canvas rebuilds the DOM instead of copying browser pixels. Learn why CSS disappears, how to diagnose it, and when to use a real browser.
Why Headless Chrome Takes Longer to Open URLs Than Headed Chrome
Headless Chrome is not inherently slower. Learn how to measure the right phase, reproduce the gap, and fix waits, startup, cache, DNS, and GPU issues.
How to Wait for a Specific AJAX Request in a Puppeteer Crawler
Use race-safe Puppeteer patterns to wait for the exact AJAX request or successful response your crawler needs, with predicates, timeouts, debugging, and retries.
Why Websites Show Different Views in Puppeteer and Regular Browsers
Puppeteer views differ because browser mode, versions, emulation, session state and timing differ. Learn a repeatable way to diagnose each variable.
How to Maximize Screen Space in Non-Headless Puppeteer
Maximize a visible Puppeteer window, remove viewport limits, handle resize timing, and troubleshoot screen dimensions on every platform.
What Is the Maximum URL Length for Puppeteer page.goto()?
Puppeteer sets no documented URL limit, but Chromium caps URLs at 2 MB. Learn what that means, why long navigations fail, and how to troubleshoot them.
What CSS Features Does wkhtmltopdf Support?
wkhtmltopdf uses an old Qt WebKit engine. Learn which CSS works, why flexbox and Grid fail, and when to move to a modern renderer.
How to Render ApexCharts Correctly in Puppeteer
Await ApexCharts render, expose a readiness signal, and make Puppeteer capture reliable with complete code, exports, debugging, and production tips.
Why Wkhtmltopdf Is Slow with Local Assets and How to Fix It
Diagnose slow wkhtmltopdf renders with local images, CSS, scripts and paths, then fix bottlenecks without sacrificing output or security.
Why wkhtmltopdf Produces Different Results on Windows Machines
Windows DPI, fonts, accounts, versions and legacy WebKit can change wkhtmltopdf output. Use this diagnostic checklist to make captures reproducible.
How to Fix Incomplete Puppeteer PDFs and Unloaded Leaflet Tiles
Make Puppeteer wait for Leaflet’s final visible tiles, then generate complete PDFs with the right media, background, and pagination settings.
How Scrolling Works in PhantomJS and Whether It Has a window Object
Learn how PhantomJS scrolling, page.evaluate, window, scrollPosition, viewportSize and input events fit together, with runnable examples and fixes.
How to Generate High-DPI Mobile Screenshots with CasperJS and PhantomJS
Learn how to create mobile-like, high-DPI screenshots with CasperJS and PhantomJS, including viewport setup, zoom workarounds, capture code, and troubleshooting.
How to Get a PDF Buffer from a Puppeteer Response Body
Learn how to capture a PDF response in Puppeteer, read it as a Buffer, save it safely, and troubleshoot downloads, encoding, and generated PDFs.