Free tools Windows power users keep installed
One-click scans. No signup required.
For responsive CSS breakpoints, use width (usually through min-width or max-width). It measures the space available to the page, while device-width describes the device’s rendering surface. The W3C marks device-related width features as deprecated and advises against using them in new stylesheets.
What `width` and `device-width` measure
| Media feature | What it describes | Best fit | Current guidance |
|---|---|---|---|
width |
In continuous media, the viewport width available to the document, including a rendered scrollbar; in paged media, the page-box width. | Responsive layout changes based on available page space. | Use for viewport or page-box sizing queries. |
device-width |
The device’s rendering surface or Web-exposed screen area. Device dimensions reflect the current orientation on devices that rotate. | Legacy compatibility cases, not ordinary responsive breakpoints. | Deprecated; W3C says authors must not use device-* features in newly written stylesheets. |
These definitions come from the W3C Media Queries Level 5 specification and its foundational Media Queries Level 3 specification.
Why `width` is the right breakpoint feature
A responsive layout needs to react to the space the document can actually use. The device’s screen dimensions do not necessarily match the page’s layout viewport, so a breakpoint based on the device surface may not reflect whether the page’s content fits. The W3C recommends `width`, `height`, and `aspect-ratio` for querying viewport or page-box size instead of `device-width`, `device-height`, and `device-aspect-ratio`.
Write breakpoints around the layout
Use a threshold where your content needs a different arrangement, rather than selecting a breakpoint because it corresponds to a named phone or device model:
Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errors#1 Best Overall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.
@media (max-width: 40rem) {
/* styles for a narrow layout viewport */
}This applies styles when the viewport width is at or below 40rem. Choose the value by checking where the current layout stops working well. For the complementary case, use min-width when styles should apply at or above a threshold.
Why a mobile breakpoint may not activate as expected
A phone’s physical screen width is not automatically the width CSS uses for the page. The layout viewport depends in part on viewport metadata. MDN notes that some mobile browsers may use a virtual viewport commonly around 980 CSS pixels when a suitable viewport tag is missing; the browser can then scale the page down, leaving a narrow-layout breakpoint inactive even though the screen looks narrow.
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.
Check viewport metadata
For a responsive page intended to use the device width in CSS pixels, MDN documents this viewport declaration:
<meta name="viewport" content="width=device-width, initial-scale=1">Do not add restrictive settings that disable zoom. MDN advises preferring viewport defaults for accessibility and user experience. See MDN’s viewport concepts guidance for the mobile viewport behavior and metadata details.
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.
How to test the condition your CSS actually queries
- Open responsive sizing tools. In your browser’s developer tools, use the responsive-design or device toolbar to simulate viewport widths. MDN’s CSS media queries guide describes responsive testing with these tools.
- Resize the viewport across the breakpoint. Check just below, at, and above your chosen threshold to confirm the expected layout change.
- Test on a handheld device when practical. Resizing a browser or rotating a device changes the width condition being evaluated; check the page in the orientation and layout where it will be used.
- If a mobile breakpoint seems ignored, inspect the viewport setup. Confirm that the page has suitable viewport metadata before concluding that the media feature is measuring the physical screen.
When should you use `device-width`?
For new responsive stylesheets, do not use `device-width`; the W3C deprecates device-* features and says authors must not use them in newly written stylesheets. If maintaining old CSS, treat existing uses as legacy behavior to review rather than as a model for new breakpoints. For layout decisions, query the viewport width with `width`.
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
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.
