-prefix-free lets you use only unprefixed CSS properties everywhere. It works behind the scenes, adding the current browser’s prefix to any CSS code, only when it’s needed.
“[-prefix-free is] fantastic, top-notch work! Thank you for creating and sharing it.”
— Eric Meyer
<link> or <style> elements and adds a vendor prefix where neededstyle attribute and adds a vendor prefix where needed<link> or <style> elements, style attribute changes and CSSOM changes (requires plugin).css() method get and set unprefixed properties (requires plugin)@import-ed files is not supportedstyle attribute) won’t work in IE and Firefox < 3.6. Properties as well in Firefox < 3.6.Check this page’s stylesheet ;-)
You can also visit the Test Drive page, type in any code you want and check out how it would get prefixed for the current browser.
Just include prefixfree.js anywhere in your page. It is recommended to put it right after the stylesheets, to minimize FOUC
That’s it, you’re done!
The target browser support is IE9+, Opera 10+, Firefox 3.5+, Safari 4+ and Chrome on desktop and Mobile Safari, Android browser, Chrome and Opera Mobile on mobile.
If it doesn’t work in any of those, it’s a bug so please report it. Just before you do, please make sure that it’s not because the browser doesn’t support a CSS3 feature at all, even with a prefix.
In older browsers like IE8, nothing will break, just properties won’t get prefixed. Which wouldn’t be useful anyway as IE8 doesn’t support much CSS3 ;)
Test the prefixing that -prefix-free would do for this browser, by writing some CSS below:
| Feature | NVIDIA DLSS 3/FG | AMD AFMF 2 | | | :--- | :--- | :--- | :--- | | Hardware Required | RTX 40-series only | RX 6000/7000 series | Any DirectX 11/12/Vulkan GPU | | Game Support | Requires developer integration | Works globally (Driver level) | Works globally (Any window/app) | | Max Multiplier | 2x | 2x | 4x (240Hz support) | | Cost | "Free" (via $400+ GPU) | Free | $7 (One time) | | Latency | Best (with Reflex) | Good | Good (Requires manual FPS capping) |
Despite the magic, LSFG 3 is not a silver bullet.
| Scenario | Native FPS | LSFG 3 Multiplier | Perceived FPS | Added Latency (Est) | Verdict | | :--- | :--- | :--- | :--- | :--- | :--- | | | 40 FPS | 2x (LSFG Quality) | 80 FPS | ~25ms | Excellent | | Racing/Sports | 60 FPS | 2x (Balanced) | 120 FPS | ~15ms | Great | | Competitive FPS | 120 FPS | 2x | 240 FPS | ~10ms | Playable | | Impossible Build | 30 FPS | 3x | 90 FPS | ~45ms | Cinematic only |
“Beginning final approach,” she said, recording for the log. “Gravitational lensing appears… controlled. No artifacts.”
Input lag—the traditional enemy of frame gen—has been slashed by 24% .
LSFG 3 shifts the load from the game engine to the video encoding/decoding and computational overhead of the interpolation.
| Feature | NVIDIA DLSS 3/FG | AMD AFMF 2 | | | :--- | :--- | :--- | :--- | | Hardware Required | RTX 40-series only | RX 6000/7000 series | Any DirectX 11/12/Vulkan GPU | | Game Support | Requires developer integration | Works globally (Driver level) | Works globally (Any window/app) | | Max Multiplier | 2x | 2x | 4x (240Hz support) | | Cost | "Free" (via $400+ GPU) | Free | $7 (One time) | | Latency | Best (with Reflex) | Good | Good (Requires manual FPS capping) |
Despite the magic, LSFG 3 is not a silver bullet. Lossless Scaling -LSFG 3-
| Scenario | Native FPS | LSFG 3 Multiplier | Perceived FPS | Added Latency (Est) | Verdict | | :--- | :--- | :--- | :--- | :--- | :--- | | | 40 FPS | 2x (LSFG Quality) | 80 FPS | ~25ms | Excellent | | Racing/Sports | 60 FPS | 2x (Balanced) | 120 FPS | ~15ms | Great | | Competitive FPS | 120 FPS | 2x | 240 FPS | ~10ms | Playable | | Impossible Build | 30 FPS | 3x | 90 FPS | ~45ms | Cinematic only | | Feature | NVIDIA DLSS 3/FG | AMD
“Beginning final approach,” she said, recording for the log. “Gravitational lensing appears… controlled. No artifacts.” No artifacts
Input lag—the traditional enemy of frame gen—has been slashed by 24% .
LSFG 3 shifts the load from the game engine to the video encoding/decoding and computational overhead of the interpolation.