What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
A Playwright fill() error does not prove that the editor stayed unchanged. In one reported CodeMirror 6 incident, text appeared to have been inserted before the call threw; retrying then produced a duplicated saved body. Check the editor and, when relevant, the saved result before inserting again. The report describes one case, not a universal CodeMirror 6 behavior or a confirmed root cause.
How can fill() throw after text has appeared?
Playwright’s locator documentation says fill() waits for actionability checks, focuses the element, fills it, and triggers an input event. That describes the documented action sequence, but it does not explain why a particular call might throw after text appears in an editor. The CodeMirror 6 account, published August 19, 2026, records the observed sequence: the call threw, text seemed to be present, and a retry led to duplicated saved content. The author’s explanation involving a mismatch in verification was a suspicion, not a demonstrated cause. Playwright Locator API Reported CodeMirror 6 incident
Keep the distinction clear: an action can report an error, while the application may already have processed some or all of its input. The report does not show that every failed fill changes the editor, nor that all CodeMirror 6 editors behave alike.
What should you do before retrying?
- Read the exception. Note what Playwright says failed rather than treating the error as evidence that nothing happened.
- Inspect the editor’s current content. Determine whether it is empty, partially filled, or already contains the intended text. Do not issue a second insertion until you know the state.
- Check persistence if saving is part of the test. Follow the application’s normal save flow, then inspect the result after reload. The visible editor state and the stored body are separate things to verify.
- Retry only from a known state. If you need to rerun the insertion, clear or otherwise establish the editor state first, and verify the result rather than assuming the second action replaces the first.
How to reproduce and diagnose the behavior
Use a clean, controlled case and record the exact setup. The reports do not provide a complete reproduction recipe, so these checks help separate an input problem from an application-save problem:
#1 Best Overall
- 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.
- Record the Playwright version, browser and browser version, CodeMirror version, and relevant editor configuration.
- Capture the complete exception and whether text is present immediately after the action.
- Compare the editor content immediately after input with the content after save and reload.
- Run each input method separately from a clean editor state. Do not combine a failed
fill()with a second insertion method before checking or resetting the content. - Repeat across the browser and version combinations your project supports; one browser’s result does not establish behavior in another.
When should you use fill() or keyboard input?
Choose the input path according to what the test is meant to exercise. Playwright documents pressSequentially() for cases that need fine-grained keyboard events. A CodeMirror forum participant reported that Playwright’s typing method worked in their CodeMirror 6 test after an older CodeMirror 5 textarea-based approach no longer applied. That is a historical individual report, not a guarantee that typing is required or best for every setup. Playwright Locator API: pressSequentially() CodeMirror forum discussion
Compare methods on the behavior your test actually depends on:
Rank #2
- 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.
- Does the test need keyboard events, or only the resulting field value?
- Does the editor accept and retain the intended state?
- Does the method behave consistently across the project’s browser and version matrix?
- After the application saves, is there exactly one copy of the intended content?
What does the separate Firefox duplicate-fill report establish?
A July 2025 issue describes a different editable-widget case: with Playwright 1.54.1, a reporter saw duplicated text in Firefox when fill() targeted a contenteditable element whose beforeinput handler changed the text and cursor. The reporter said the problem did not appear in manual testing or in Chrome and Safari runs, and that keyboard input passed their test. This bounded report makes duplicate insertion a documented edge case under that setup; it does not identify the cause of the CodeMirror 6 incident. Playwright issue 36924
What is—and is not—known about the cause?
The available reports do not establish the root cause of the CodeMirror 6 exception, how often it occurs, or a fix that works for every editor installation. Playwright’s documented behavior explains what fill() is intended to do, while the CodeMirror account describes one observed failure and the Firefox issue concerns a separate beforeinput setup. Treat them as evidence to check state carefully, not as proof of one shared mechanism.
Quick Recap
Best Value
- 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
- 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
- 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.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
