diff --git a/scripts/build-prefixes.js b/scripts/build-prefixes.js
index cefae139..77a13a5b 100644
--- a/scripts/build-prefixes.js
+++ b/scripts/build-prefixes.js
@@ -222,13 +222,14 @@ let prefixMapping = {
 
 let enumify = (f) => f.replace(/^@([a-z])/, (_, x) => 'At' + x.toUpperCase()).replace(/^::([a-z])/, (_, x) => 'PseudoElement' + x.toUpperCase()).replace(/^:([a-z])/, (_, x) => 'PseudoClass' + x.toUpperCase()).replace(/(^|-)([a-z])/g, (_, a, x) => x.toUpperCase())
 
+let allBrowsers = Object.keys(browsers).filter(b => !(b in BROWSER_MAPPING)).sort();
 let targets = `// This file is autogenerated by build-prefixes.js. DO NOT EDIT!
 
 use serde::{Deserialize, Serialize};
 
 #[derive(Serialize, Debug, Deserialize, Clone, Copy, Default)]
 pub struct Browsers {
-  pub ${Object.keys(browsers).filter(b => !(b in BROWSER_MAPPING)).sort().join(': Option<u32>,\n  pub ')}: Option<u32>
+  pub ${allBrowsers.join(': Option<u32>,\n  pub ')}: Option<u32>
 }
 `;
 
@@ -237,7 +238,7 @@ fs.writeFileSync('src/targets.rs', targets);
 let targets_dts = `// This file is autogenerated by build-prefixes.js. DO NOT EDIT!
 
 export interface Targets {
-  ${Object.keys(browsers).filter(b => !(b in BROWSER_MAPPING)).sort().join('?: number,\n  ')}?: number
+  ${allBrowsers.join('?: number,\n  ')}?: number
 }
 `;
 
@@ -315,19 +316,20 @@ pub enum Feature {
 impl Feature {
   pub fn is_compatible(&self, browsers: Browsers) -> bool {
     match self {
-      ${[...compat].map(([features, browsers]) =>
-        `${features.map(name => `Feature::${enumify(name)}`).join(' |\n      ')} => {` + (Object.entries(browsers).length === 0 ? '}' : `
-        ${Object.entries(browsers).map(([browser, min]) =>
+      ${[...compat].map(([features, supportedBrowsers]) =>
+        `${features.map(name => `Feature::${enumify(name)}`).join(' |\n      ')} => {` + (Object.entries(supportedBrowsers).length === 0 ? '\n        return false\n      }' : `
+        ${Object.entries(supportedBrowsers).map(([browser, min]) =>
             `if let Some(version) = browsers.${browser} {
-          if version >= ${min} {
-            return true
+          if version < ${min} {
+            return false
           }
-        }`
-          ).join('\n        ')}
+        }`).join('\n        ')}${Object.keys(supportedBrowsers).length === allBrowsers.length ? '' : `\n        if ${allBrowsers.filter(b => !supportedBrowsers[b]).map(browser => `browsers.${browser}.is_some()`).join(' || ')} {
+          return false
+        }`}
       }`
       )).join('\n      ')}
     }
-    false
+    true
   }
 }
 `;
diff --git a/src/compat.rs b/src/compat.rs
index b6f16b03..60b95070 100644
--- a/src/compat.rs
+++ b/src/compat.rs
@@ -55,1466 +55,1558 @@ impl Feature {
     match self {
       Feature::CssSel2 => {
         if let Some(version) = browsers.ie {
-          if version >= 458752 {
-            return true
+          if version < 458752 {
+            return false
           }
         }
         if let Some(version) = browsers.edge {
-          if version >= 786432 {
-            return true
+          if version < 786432 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 131072 {
-            return true
+          if version < 131072 {
+            return false
           }
         }
         if let Some(version) = browsers.chrome {
-          if version >= 262144 {
-            return true
+          if version < 262144 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 196864 {
-            return true
+          if version < 196864 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 589824 {
-            return true
+          if version < 589824 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 197120 {
-            return true
+          if version < 197120 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 131328 {
-            return true
+          if version < 131328 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 262144 {
-            return true
+          if version < 262144 {
+            return false
           }
         }
       }
       Feature::CssSel3 => {
         if let Some(version) = browsers.ie {
-          if version >= 589824 {
-            return true
+          if version < 589824 {
+            return false
           }
         }
         if let Some(version) = browsers.edge {
-          if version >= 786432 {
-            return true
+          if version < 786432 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 197888 {
-            return true
+          if version < 197888 {
+            return false
           }
         }
         if let Some(version) = browsers.chrome {
-          if version >= 262144 {
-            return true
+          if version < 262144 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 197120 {
-            return true
+          if version < 197120 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 591104 {
-            return true
+          if version < 591104 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 197120 {
-            return true
+          if version < 197120 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 131328 {
-            return true
+          if version < 131328 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 262144 {
-            return true
+          if version < 262144 {
+            return false
           }
         }
       }
       Feature::CssGencontent |
       Feature::CssFirstLine => {
         if let Some(version) = browsers.ie {
-          if version >= 589824 {
-            return true
+          if version < 589824 {
+            return false
           }
         }
         if let Some(version) = browsers.edge {
-          if version >= 786432 {
-            return true
+          if version < 786432 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 131072 {
-            return true
+          if version < 131072 {
+            return false
           }
         }
         if let Some(version) = browsers.chrome {
-          if version >= 262144 {
-            return true
+          if version < 262144 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 196864 {
-            return true
+          if version < 196864 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 589824 {
-            return true
+          if version < 589824 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 197120 {
-            return true
+          if version < 197120 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 131328 {
-            return true
+          if version < 131328 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 262144 {
-            return true
+          if version < 262144 {
+            return false
           }
         }
       }
       Feature::CssFirstLetter => {
         if let Some(version) = browsers.ie {
-          if version >= 589824 {
-            return true
+          if version < 589824 {
+            return false
           }
         }
         if let Some(version) = browsers.edge {
-          if version >= 786432 {
-            return true
+          if version < 786432 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 197888 {
-            return true
+          if version < 197888 {
+            return false
           }
         }
         if let Some(version) = browsers.chrome {
-          if version >= 589824 {
-            return true
+          if version < 589824 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 327936 {
-            return true
+          if version < 327936 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 722432 {
-            return true
+          if version < 722432 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 327680 {
-            return true
+          if version < 327680 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 196608 {
-            return true
+          if version < 196608 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 262144 {
-            return true
+          if version < 262144 {
+            return false
           }
         }
       }
       Feature::CssInOutOfRange => {
         if let Some(version) = browsers.edge {
-          if version >= 5177344 {
-            return true
+          if version < 5177344 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 3276800 {
-            return true
+          if version < 3276800 {
+            return false
           }
         }
         if let Some(version) = browsers.chrome {
-          if version >= 3473408 {
-            return true
+          if version < 3473408 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 655616 {
-            return true
+          if version < 655616 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 2621440 {
-            return true
+          if version < 2621440 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 656128 {
-            return true
+          if version < 656128 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 6356992 {
-            return true
+          if version < 6356992 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 327680 {
-            return true
+          if version < 327680 {
+            return false
           }
         }
+        if browsers.ie.is_some() {
+          return false
+        }
       }
       Feature::FormValidation => {
         if let Some(version) = browsers.ie {
-          if version >= 655360 {
-            return true
+          if version < 655360 {
+            return false
           }
         }
         if let Some(version) = browsers.edge {
-          if version >= 786432 {
-            return true
+          if version < 786432 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 262144 {
-            return true
+          if version < 262144 {
+            return false
           }
         }
         if let Some(version) = browsers.chrome {
-          if version >= 655360 {
-            return true
+          if version < 655360 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 655616 {
-            return true
+          if version < 655616 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 655360 {
-            return true
+          if version < 655360 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 656128 {
-            return true
+          if version < 656128 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 263171 {
-            return true
+          if version < 263171 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 262144 {
-            return true
+          if version < 262144 {
+            return false
           }
         }
       }
       Feature::CssAnyLink => {
         if let Some(version) = browsers.edge {
-          if version >= 5177344 {
-            return true
+          if version < 5177344 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 3276800 {
-            return true
+          if version < 3276800 {
+            return false
           }
         }
         if let Some(version) = browsers.chrome {
-          if version >= 4259840 {
-            return true
+          if version < 4259840 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 589824 {
-            return true
+          if version < 589824 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 3407872 {
-            return true
+          if version < 3407872 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 589824 {
-            return true
+          if version < 589824 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 6356992 {
-            return true
+          if version < 6356992 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 590336 {
-            return true
+          if version < 590336 {
+            return false
           }
         }
+        if browsers.ie.is_some() {
+          return false
+        }
       }
       Feature::CssDefaultPseudo => {
         if let Some(version) = browsers.edge {
-          if version >= 5177344 {
-            return true
+          if version < 5177344 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 262144 {
-            return true
+          if version < 262144 {
+            return false
           }
         }
         if let Some(version) = browsers.chrome {
-          if version >= 3342336 {
-            return true
+          if version < 3342336 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 655616 {
-            return true
+          if version < 655616 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 2490368 {
-            return true
+          if version < 2490368 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 656128 {
-            return true
+          if version < 656128 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 6356992 {
-            return true
+          if version < 6356992 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 327680 {
-            return true
+          if version < 327680 {
+            return false
           }
         }
+        if browsers.ie.is_some() {
+          return false
+        }
       }
       Feature::CssDirPseudo => {
         if let Some(version) = browsers.firefox {
-          if version >= 3211264 {
-            return true
+          if version < 3211264 {
+            return false
           }
         }
+        if browsers.android.is_some() || browsers.chrome.is_some() || browsers.edge.is_some() || browsers.ie.is_some() || browsers.ios_saf.is_some() || browsers.opera.is_some() || browsers.safari.is_some() || browsers.samsung.is_some() {
+          return false
+        }
       }
       Feature::CssFocusWithin => {
         if let Some(version) = browsers.edge {
-          if version >= 5177344 {
-            return true
+          if version < 5177344 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 3407872 {
-            return true
+          if version < 3407872 {
+            return false
           }
         }
         if let Some(version) = browsers.chrome {
-          if version >= 3932160 {
-            return true
+          if version < 3932160 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 655616 {
-            return true
+          if version < 655616 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 3080192 {
-            return true
+          if version < 3080192 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 656128 {
-            return true
+          if version < 656128 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 6356992 {
-            return true
+          if version < 6356992 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 524800 {
-            return true
+          if version < 524800 {
+            return false
           }
         }
+        if browsers.ie.is_some() {
+          return false
+        }
       }
       Feature::CssFocusVisible => {
         if let Some(version) = browsers.edge {
-          if version >= 5636096 {
-            return true
+          if version < 5636096 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 5570560 {
-            return true
+          if version < 5570560 {
+            return false
           }
         }
         if let Some(version) = browsers.chrome {
-          if version >= 5636096 {
-            return true
+          if version < 5636096 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 4718592 {
-            return true
+          if version < 4718592 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 6356992 {
-            return true
+          if version < 6356992 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 917504 {
-            return true
+          if version < 917504 {
+            return false
           }
         }
+        if browsers.ie.is_some() || browsers.ios_saf.is_some() || browsers.safari.is_some() {
+          return false
+        }
       }
       Feature::CssIndeterminatePseudo => {
         if let Some(version) = browsers.edge {
-          if version >= 5177344 {
-            return true
+          if version < 5177344 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 3342336 {
-            return true
+          if version < 3342336 {
+            return false
           }
         }
         if let Some(version) = browsers.chrome {
-          if version >= 2555904 {
-            return true
+          if version < 2555904 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 655616 {
-            return true
+          if version < 655616 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 1703936 {
-            return true
+          if version < 1703936 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 656128 {
-            return true
+          if version < 656128 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 6356992 {
-            return true
+          if version < 6356992 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 262144 {
-            return true
+          if version < 262144 {
+            return false
           }
         }
+        if browsers.ie.is_some() {
+          return false
+        }
       }
       Feature::CssMatchesPseudo => {
         if let Some(version) = browsers.edge {
-          if version >= 5767168 {
-            return true
+          if version < 5767168 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 5111808 {
-            return true
+          if version < 5111808 {
+            return false
           }
         }
         if let Some(version) = browsers.chrome {
-          if version >= 5767168 {
-            return true
+          if version < 5767168 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 917504 {
-            return true
+          if version < 917504 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 4915200 {
-            return true
+          if version < 4915200 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 917504 {
-            return true
+          if version < 917504 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 6356992 {
-            return true
+          if version < 6356992 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 983040 {
-            return true
+          if version < 983040 {
+            return false
           }
         }
+        if browsers.ie.is_some() {
+          return false
+        }
       }
       Feature::CssOptionalPseudo => {
         if let Some(version) = browsers.ie {
-          if version >= 655360 {
-            return true
+          if version < 655360 {
+            return false
           }
         }
         if let Some(version) = browsers.edge {
-          if version >= 786432 {
-            return true
+          if version < 786432 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 262144 {
-            return true
+          if version < 262144 {
+            return false
           }
         }
         if let Some(version) = browsers.chrome {
-          if version >= 983040 {
-            return true
+          if version < 983040 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 327680 {
-            return true
+          if version < 327680 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 983040 {
-            return true
+          if version < 983040 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 327680 {
-            return true
+          if version < 327680 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 131840 {
-            return true
+          if version < 131840 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 262144 {
-            return true
+          if version < 262144 {
+            return false
           }
         }
       }
       Feature::CssPlaceholderShown => {
         if let Some(version) = browsers.edge {
-          if version >= 5177344 {
-            return true
+          if version < 5177344 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 3342336 {
-            return true
+          if version < 3342336 {
+            return false
           }
         }
         if let Some(version) = browsers.chrome {
-          if version >= 3080192 {
-            return true
+          if version < 3080192 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 589824 {
-            return true
+          if version < 589824 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 2228224 {
-            return true
+          if version < 2228224 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 589824 {
-            return true
+          if version < 589824 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 6356992 {
-            return true
+          if version < 6356992 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 327680 {
-            return true
+          if version < 327680 {
+            return false
           }
         }
+        if browsers.ie.is_some() {
+          return false
+        }
       }
       Feature::Dialog => {
         if let Some(version) = browsers.edge {
-          if version >= 5177344 {
-            return true
+          if version < 5177344 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 6422528 {
-            return true
+          if version < 6422528 {
+            return false
           }
         }
         if let Some(version) = browsers.chrome {
-          if version >= 2424832 {
-            return true
+          if version < 2424832 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 1572864 {
-            return true
+          if version < 1572864 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 6356992 {
-            return true
+          if version < 6356992 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 262144 {
-            return true
+          if version < 262144 {
+            return false
           }
         }
+        if browsers.ie.is_some() || browsers.ios_saf.is_some() || browsers.safari.is_some() {
+          return false
+        }
       }
       Feature::Fullscreen => {
         if let Some(version) = browsers.edge {
-          if version >= 5177344 {
-            return true
+          if version < 5177344 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 4194304 {
-            return true
+          if version < 4194304 {
+            return false
           }
         }
         if let Some(version) = browsers.chrome {
-          if version >= 4653056 {
-            return true
+          if version < 4653056 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 786688 {
-            return true
+          if version < 786688 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 655616 {
-            return true
+          if version < 655616 {
+            return false
           }
         }
+        if browsers.android.is_some() || browsers.ie.is_some() || browsers.ios_saf.is_some() || browsers.safari.is_some() {
+          return false
+        }
       }
       Feature::CssMarkerPseudo => {
         if let Some(version) = browsers.edge {
-          if version >= 5636096 {
-            return true
+          if version < 5636096 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 4456448 {
-            return true
+          if version < 4456448 {
+            return false
           }
         }
         if let Some(version) = browsers.chrome {
-          if version >= 5636096 {
-            return true
+          if version < 5636096 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 4718592 {
-            return true
+          if version < 4718592 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 721664 {
-            return true
+          if version < 721664 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 6356992 {
-            return true
+          if version < 6356992 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 917504 {
-            return true
+          if version < 917504 {
+            return false
           }
         }
+        if browsers.ie.is_some() || browsers.safari.is_some() {
+          return false
+        }
       }
       Feature::CssPlaceholder => {
         if let Some(version) = browsers.edge {
-          if version >= 5177344 {
-            return true
+          if version < 5177344 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 3342336 {
-            return true
+          if version < 3342336 {
+            return false
           }
         }
         if let Some(version) = browsers.chrome {
-          if version >= 3735552 {
-            return true
+          if version < 3735552 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 655616 {
-            return true
+          if version < 655616 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 2883584 {
-            return true
+          if version < 2883584 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 656128 {
-            return true
+          if version < 656128 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 6356992 {
-            return true
+          if version < 6356992 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 459264 {
-            return true
+          if version < 459264 {
+            return false
           }
         }
+        if browsers.ie.is_some() {
+          return false
+        }
       }
       Feature::CssSelection => {
         if let Some(version) = browsers.ie {
-          if version >= 589824 {
-            return true
+          if version < 589824 {
+            return false
           }
         }
         if let Some(version) = browsers.edge {
-          if version >= 786432 {
-            return true
+          if version < 786432 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 4063232 {
-            return true
+          if version < 4063232 {
+            return false
           }
         }
         if let Some(version) = browsers.chrome {
-          if version >= 262144 {
-            return true
+          if version < 262144 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 196864 {
-            return true
+          if version < 196864 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 591104 {
-            return true
+          if version < 591104 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 263168 {
-            return true
+          if version < 263168 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 262144 {
-            return true
+          if version < 262144 {
+            return false
           }
         }
+        if browsers.ios_saf.is_some() {
+          return false
+        }
       }
       Feature::CssCaseInsensitive => {
         if let Some(version) = browsers.edge {
-          if version >= 5177344 {
-            return true
+          if version < 5177344 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 3080192 {
-            return true
+          if version < 3080192 {
+            return false
           }
         }
         if let Some(version) = browsers.chrome {
-          if version >= 3211264 {
-            return true
+          if version < 3211264 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 589824 {
-            return true
+          if version < 589824 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 2359296 {
-            return true
+          if version < 2359296 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 589824 {
-            return true
+          if version < 589824 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 6356992 {
-            return true
+          if version < 6356992 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 327680 {
-            return true
+          if version < 327680 {
+            return false
           }
         }
+        if browsers.ie.is_some() {
+          return false
+        }
       }
       Feature::CssReadOnlyWrite => {
         if let Some(version) = browsers.edge {
-          if version >= 851968 {
-            return true
+          if version < 851968 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 5111808 {
-            return true
+          if version < 5111808 {
+            return false
           }
         }
         if let Some(version) = browsers.chrome {
-          if version >= 2359296 {
-            return true
+          if version < 2359296 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 589824 {
-            return true
+          if version < 589824 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 1507328 {
-            return true
+          if version < 1507328 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 589824 {
-            return true
+          if version < 589824 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 6356992 {
-            return true
+          if version < 6356992 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 262144 {
-            return true
+          if version < 262144 {
+            return false
           }
         }
+        if browsers.ie.is_some() {
+          return false
+        }
       }
       Feature::CssAutofill => {
         if let Some(version) = browsers.chrome {
-          if version >= 6291456 {
-            return true
+          if version < 6291456 {
+            return false
           }
         }
         if let Some(version) = browsers.edge {
-          if version >= 6291456 {
-            return true
+          if version < 6291456 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 5636096 {
-            return true
+          if version < 5636096 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 5373952 {
-            return true
+          if version < 5373952 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 6356992 {
-            return true
+          if version < 6356992 {
+            return false
           }
         }
+        if browsers.ie.is_some() || browsers.ios_saf.is_some() || browsers.safari.is_some() || browsers.samsung.is_some() {
+          return false
+        }
       }
       Feature::CssNamespaces => {
         if let Some(version) = browsers.ie {
-          if version >= 589824 {
-            return true
+          if version < 589824 {
+            return false
           }
         }
         if let Some(version) = browsers.edge {
-          if version >= 786432 {
-            return true
+          if version < 786432 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 131072 {
-            return true
+          if version < 131072 {
+            return false
           }
         }
         if let Some(version) = browsers.chrome {
-          if version >= 262144 {
-            return true
+          if version < 262144 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 262144 {
-            return true
+          if version < 262144 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 589824 {
-            return true
+          if version < 589824 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 262656 {
-            return true
+          if version < 262656 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 131328 {
-            return true
+          if version < 131328 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 262144 {
-            return true
+          if version < 262144 {
+            return false
           }
         }
       }
       Feature::Shadowdomv1 => {
         if let Some(version) = browsers.edge {
-          if version >= 5177344 {
-            return true
+          if version < 5177344 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 4128768 {
-            return true
+          if version < 4128768 {
+            return false
           }
         }
         if let Some(version) = browsers.chrome {
-          if version >= 3473408 {
-            return true
+          if version < 3473408 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 655360 {
-            return true
+          if version < 655360 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 2621440 {
-            return true
+          if version < 2621440 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 720896 {
-            return true
+          if version < 720896 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 6356992 {
-            return true
+          if version < 6356992 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 393728 {
-            return true
+          if version < 393728 {
+            return false
           }
         }
+        if browsers.ie.is_some() {
+          return false
+        }
       }
       Feature::CssRrggbbaa => {
         if let Some(version) = browsers.edge {
-          if version >= 5177344 {
-            return true
+          if version < 5177344 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 3211264 {
-            return true
+          if version < 3211264 {
+            return false
           }
         }
         if let Some(version) = browsers.chrome {
-          if version >= 4063232 {
-            return true
+          if version < 4063232 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 655360 {
-            return true
+          if version < 655360 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 3407872 {
-            return true
+          if version < 3407872 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 655360 {
-            return true
+          if version < 655360 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 6356992 {
-            return true
+          if version < 6356992 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 524800 {
-            return true
+          if version < 524800 {
+            return false
           }
         }
+        if browsers.ie.is_some() {
+          return false
+        }
       }
       Feature::CssNesting |
       Feature::CustomMediaQueries |
-      Feature::MediaIntervalSyntax => {}
+      Feature::MediaIntervalSyntax => {
+        return false
+      }
       Feature::DoublePositionGradients => {
         if let Some(version) = browsers.chrome {
-          if version >= 4653056 {
-            return true
+          if version < 4653056 {
+            return false
           }
         }
         if let Some(version) = browsers.edge {
-          if version >= 5177344 {
-            return true
+          if version < 5177344 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 4194304 {
-            return true
+          if version < 4194304 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 3276800 {
-            return true
+          if version < 3276800 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 786688 {
-            return true
+          if version < 786688 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 786944 {
-            return true
+          if version < 786944 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 655360 {
-            return true
+          if version < 655360 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 4653056 {
-            return true
+          if version < 4653056 {
+            return false
           }
         }
+        if browsers.ie.is_some() {
+          return false
+        }
       }
       Feature::Clamp => {
         if let Some(version) = browsers.chrome {
-          if version >= 5177344 {
-            return true
+          if version < 5177344 {
+            return false
           }
         }
         if let Some(version) = browsers.edge {
-          if version >= 5177344 {
-            return true
+          if version < 5177344 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 5177344 {
-            return true
+          if version < 5177344 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 3735552 {
-            return true
+          if version < 3735552 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 852224 {
-            return true
+          if version < 852224 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 852992 {
-            return true
+          if version < 852992 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 786432 {
-            return true
+          if version < 786432 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 5177344 {
-            return true
+          if version < 5177344 {
+            return false
           }
         }
+        if browsers.ie.is_some() {
+          return false
+        }
       }
       Feature::PlaceSelf |
       Feature::PlaceItems => {
         if let Some(version) = browsers.chrome {
-          if version >= 3866624 {
-            return true
+          if version < 3866624 {
+            return false
           }
         }
         if let Some(version) = browsers.edge {
-          if version >= 5177344 {
-            return true
+          if version < 5177344 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 2949120 {
-            return true
+          if version < 2949120 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 2818048 {
-            return true
+          if version < 2818048 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 720896 {
-            return true
+          if version < 720896 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 720896 {
-            return true
+          if version < 720896 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 458752 {
-            return true
+          if version < 458752 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 3866624 {
-            return true
+          if version < 3866624 {
+            return false
           }
         }
+        if browsers.ie.is_some() {
+          return false
+        }
       }
       Feature::PlaceContent => {
         if let Some(version) = browsers.chrome {
-          if version >= 3866624 {
-            return true
+          if version < 3866624 {
+            return false
           }
         }
         if let Some(version) = browsers.edge {
-          if version >= 5177344 {
-            return true
+          if version < 5177344 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 2949120 {
-            return true
+          if version < 2949120 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 2818048 {
-            return true
+          if version < 2818048 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 589824 {
-            return true
+          if version < 589824 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 589824 {
-            return true
+          if version < 589824 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 458752 {
-            return true
+          if version < 458752 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 3866624 {
-            return true
+          if version < 3866624 {
+            return false
           }
         }
+        if browsers.ie.is_some() {
+          return false
+        }
       }
       Feature::OverflowShorthand => {
         if let Some(version) = browsers.chrome {
-          if version >= 4456448 {
-            return true
+          if version < 4456448 {
+            return false
           }
         }
         if let Some(version) = browsers.edge {
-          if version >= 5177344 {
-            return true
+          if version < 5177344 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 3997696 {
-            return true
+          if version < 3997696 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 3145728 {
-            return true
+          if version < 3145728 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 655360 {
-            return true
+          if version < 655360 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 4456448 {
-            return true
+          if version < 4456448 {
+            return false
           }
         }
+        if browsers.ie.is_some() || browsers.ios_saf.is_some() || browsers.safari.is_some() {
+          return false
+        }
       }
       Feature::MediaRangeSyntax => {
         if let Some(version) = browsers.firefox {
-          if version >= 4128768 {
-            return true
+          if version < 4128768 {
+            return false
           }
         }
+        if browsers.android.is_some() || browsers.chrome.is_some() || browsers.edge.is_some() || browsers.ie.is_some() || browsers.ios_saf.is_some() || browsers.opera.is_some() || browsers.safari.is_some() || browsers.samsung.is_some() {
+          return false
+        }
       }
       Feature::LogicalBorders |
       Feature::LogicalMargin |
       Feature::LogicalPadding => {
         if let Some(version) = browsers.chrome {
-          if version >= 4521984 {
-            return true
+          if version < 4521984 {
+            return false
           }
         }
         if let Some(version) = browsers.edge {
-          if version >= 5177344 {
-            return true
+          if version < 5177344 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 2686976 {
-            return true
+          if version < 2686976 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 3145728 {
-            return true
+          if version < 3145728 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 786688 {
-            return true
+          if version < 786688 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 786944 {
-            return true
+          if version < 786944 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 655360 {
-            return true
+          if version < 655360 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 4521984 {
-            return true
+          if version < 4521984 {
+            return false
           }
         }
+        if browsers.ie.is_some() {
+          return false
+        }
       }
       Feature::LogicalBorderRadius => {
         if let Some(version) = browsers.chrome {
-          if version >= 5832704 {
-            return true
+          if version < 5832704 {
+            return false
           }
         }
         if let Some(version) = browsers.edge {
-          if version >= 5832704 {
-            return true
+          if version < 5832704 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 4325376 {
-            return true
+          if version < 4325376 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 4915200 {
-            return true
+          if version < 4915200 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 983040 {
-            return true
+          if version < 983040 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 983040 {
-            return true
+          if version < 983040 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 983040 {
-            return true
+          if version < 983040 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 5832704 {
-            return true
+          if version < 5832704 {
+            return false
           }
         }
+        if browsers.ie.is_some() {
+          return false
+        }
       }
       Feature::LogicalInset => {
         if let Some(version) = browsers.chrome {
-          if version >= 5701632 {
-            return true
+          if version < 5701632 {
+            return false
           }
         }
         if let Some(version) = browsers.edge {
-          if version >= 5701632 {
-            return true
+          if version < 5701632 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 4128768 {
-            return true
+          if version < 4128768 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 4063232 {
-            return true
+          if version < 4063232 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 917760 {
-            return true
+          if version < 917760 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 918784 {
-            return true
+          if version < 918784 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 917504 {
-            return true
+          if version < 917504 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 5701632 {
-            return true
+          if version < 5701632 {
+            return false
           }
         }
+        if browsers.ie.is_some() {
+          return false
+        }
       }
       Feature::LogicalSize => {
         if let Some(version) = browsers.chrome {
-          if version >= 3735552 {
-            return true
+          if version < 3735552 {
+            return false
           }
         }
         if let Some(version) = browsers.edge {
-          if version >= 5177344 {
-            return true
+          if version < 5177344 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 2686976 {
-            return true
+          if version < 2686976 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 2818048 {
-            return true
+          if version < 2818048 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 786688 {
-            return true
+          if version < 786688 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 786944 {
-            return true
+          if version < 786944 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 327680 {
-            return true
+          if version < 327680 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 3735552 {
-            return true
+          if version < 3735552 {
+            return false
           }
         }
+        if browsers.ie.is_some() {
+          return false
+        }
       }
       Feature::LogicalTextAlign => {
         if let Some(version) = browsers.chrome {
-          if version >= 1179648 {
-            return true
+          if version < 1179648 {
+            return false
           }
         }
         if let Some(version) = browsers.edge {
-          if version >= 5177344 {
-            return true
+          if version < 5177344 {
+            return false
           }
         }
         if let Some(version) = browsers.firefox {
-          if version >= 262144 {
-            return true
+          if version < 262144 {
+            return false
           }
         }
         if let Some(version) = browsers.opera {
-          if version >= 917504 {
-            return true
+          if version < 917504 {
+            return false
           }
         }
         if let Some(version) = browsers.safari {
-          if version >= 196864 {
-            return true
+          if version < 196864 {
+            return false
           }
         }
         if let Some(version) = browsers.ios_saf {
-          if version >= 131072 {
-            return true
+          if version < 131072 {
+            return false
           }
         }
         if let Some(version) = browsers.samsung {
-          if version >= 65536 {
-            return true
+          if version < 65536 {
+            return false
           }
         }
         if let Some(version) = browsers.android {
-          if version >= 2424832 {
-            return true
+          if version < 2424832 {
+            return false
           }
         }
+        if browsers.ie.is_some() {
+          return false
+        }
       }
     }
-    false
+    true
   }
 }
diff --git a/src/lib.rs b/src/lib.rs
index 7c7c677c..c966238e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -7517,6 +7517,36 @@ mod tests {
         ..Browsers::default()
       }
     );
+
+    prefix_test(
+      ".foo { color: rgba(123, 456, 789, 0.5) }",
+      indoc! { r#"
+        .foo {
+          color: rgba(123, 255, 255, .5);
+        }
+      "#},
+      Browsers {
+        firefox: Some(48 << 16),
+        safari: Some(10 << 16),
+        ios_saf: Some(9 << 16),
+        ..Browsers::default()
+      }
+    );
+
+    prefix_test(
+      ".foo { color: rgba(123, 456, 789, 0.5) }",
+      indoc! { r#"
+        .foo {
+          color: #7bffff80;
+        }
+      "#},
+      Browsers {
+        firefox: Some(49 << 16),
+        safari: Some(10 << 16),
+        ios_saf: Some(10 << 16),
+        ..Browsers::default()
+      }
+    );
   }
 
   #[cfg(feature = "grid")]