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Set the browser viewport to explicit width and height in CSS pixels before navigating, then capture the visible viewport and compare it with a reviewed visual baseline. Also control device scale and any relevant mobile emulation. A fixed viewport makes the test repeatable, but it cannot by itself guarantee pixel-identical output across different browsers, operating systems, or rendering environments.
What a fixed viewport test should control
A viewport is the page’s visible area, expressed as a width and height in CSS pixels. Set both dimensions before loading the page under test. Keep related settings distinct: viewport size is not the same as screen dimensions, device scale factor, user agent, touch support, or mobile emulation. Playwright documents these as separate controls, and a preset device’s viewport can be overridden. See Playwright’s emulation guide.
- Viewport width and height: the layout area the page sees.
- Device scale factor: how CSS pixels map to device pixels and, when device scale is selected, the screenshot’s output dimensions.
- Mobile emulation: use mobile mode, touch, and a user agent when those conditions are part of the behavior being tested; changing viewport dimensions alone does not reproduce them.
- Capture scope: a viewport screenshot tests what is visible in that area; a full-page screenshot tests the scrollable document and is a different assertion.
Playwright’s Page API describes viewport and screenshot settings. Its screenshot scale can be set to CSS pixels (one output pixel per CSS pixel) or device pixels; device-pixel output can be larger on a high-density configuration.
Run a fixed-viewport visual regression test
- Choose the dimensions and rendering profile. Pick the CSS-pixel width and height that represent the layout you need to verify. If testing a mobile or high-density profile, define the matching device scale and relevant emulation settings as well.
- Apply settings before navigation. Configure the browser context or page before opening the target URL so the page renders at the intended viewport from its first load.
- Capture only what the test intends. Use a viewport capture for a fixed-viewport check. Enable full-page capture only when the complete scrollable page is the subject. Select CSS or device scale deliberately.
- Create and review a baseline. Playwright Test’s
toHaveScreenshot()creates a reference image on its first run; review it and commit it so later changes can be inspected. Subsequent runs compare captures with that baseline. See Playwright visual comparisons. - Set comparison tolerance to match the test. Playwright screenshot assertions provide difference-threshold controls and stylesheet options. Use a threshold appropriate to the change you want to catch, rather than treating an unexplained default as universally correct. The available assertion options are documented in the PageAssertions API.
- Reduce avoidable variation. Stabilize page state and hide or normalize genuinely dynamic content where appropriate. A supplied stylesheet can make captures more repeatable. During snapshot creation, Playwright’s visual comparison process takes screenshots repeatedly until two consecutive captures match.
- Keep baseline and comparison conditions consistent. Prefer running in the same environment used to create the baseline. Browser version, operating system, settings, hardware, power source, and headless mode can affect rendering even when the viewport is unchanged.
Choose the right capture and comparison settings
| Decision | Use this when | What changes |
|---|---|---|
| Viewport dimensions | You need to verify a particular visible layout size. | Set explicit width and height in CSS pixels before navigation. |
| Device emulation and scale | The expected rendering depends on mobile behavior or high-density output. | Viewport, screen dimensions, device scale, user agent, touch, and mobile mode are separate controls. |
| Viewport versus full page | You are testing either the visible frame or the full scrollable document. | Full-page output covers a different area and should not be substituted for a viewport test. |
| CSS-pixel versus device-pixel screenshot | You need output dimensions corresponding to CSS layout or device density. | Device-pixel output may be larger; CSS scale produces one image pixel per CSS pixel. |
| Difference tolerance and styling | You need to balance sensitivity against known rendering variation. | Thresholds and stylesheet normalization should reflect the visual changes the test is intended to detect. |
| Browser and host environment | You need stable regression comparisons over time. | Operating system, browser version, settings, hardware, power source, and headless mode can affect results. |
There is no universally correct viewport or visual-difference tolerance: choose them from the interface and regressions the test is meant to catch. Playwright recommends running comparisons in the same environment that generated the baseline.
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#1 Best Overall
Elebase USB to USB C Adapter for iPhone 18 Pro Max,USBC Car Charger Adapter
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
Troubleshoot mismatched or unstable screenshots
- Layout differs despite setting a width: confirm both viewport dimensions are set, that they are applied before navigation, and that no device preset or later configuration overrides them.
- Mobile layout does not match a phone: check mobile mode, touch support, user agent, and device scale as well as viewport dimensions. These settings are not interchangeable.
- Image dimensions are larger than expected: check whether the capture uses device scale rather than CSS scale, and confirm the configured device scale factor.
- The screenshot includes content below the fold: disable full-page capture for a viewport-only assertion.
- Repeated runs differ without a code change: stabilize dynamic page content, use screenshot styling to normalize appropriate elements, and compare in the baseline’s browser and host environment.
- Small differences fail the test: review the baseline and tune the difference threshold to the intended sensitivity. Do not mask or loosen differences that the test is supposed to catch.
- The baseline changes unexpectedly: treat the first-run reference as a proposed baseline, review it before committing, and ensure later runs use the same rendering environment.
Or skip the browser setup
ScreenshotNeo can produce a screenshot from one GET request, with viewport and other capture options available in its API documentation. For a stable comparison workflow, keep your requested viewport settings and baseline environment consistent.
Example cURL request, adapting the target URL as needed:
Rank #2
Anker USB-C Hub, 5-in-1 USB Hub for Laptops, 4K HDMI Multiport Adapter
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webp
Quick Recap
Bestseller No. 5
Best Value
Anker USB C Hub, 5-in-1 USBC to HDMI Splitter with 4K Display
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Rank #4
Sale
UGREEN USB to USB C Adapter Combo 4-Pack, 10Gbps USB C Converter Space Gray
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Rank #3
Sale
Anker USB C Hub, 7in1 Multi-Port USB Adapter, 4K@60Hz USBC to HDMI Splitter
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Cookie banners are accepted before capture and more than 60 known consent platforms, newsletter popups, and chat widgets can be removed; each cleanup step can be turned off. Bot checks, blank pages, failed loads, timeouts, and cache hits are not billed, and response headers report the page verdict and billing status. An MCP server provides screenshot tools for AI agents, including Claude, Cursor, and other MCP clients. The Free plan includes 1,000 shots per month with no card; paid plans start at $5 for 3,000 shots.
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