diff --git a/browsers.json b/browsers.json
index bb5e2894..e902a541 100644
--- a/browsers.json
+++ b/browsers.json
@@ -1,59 +1,31 @@
 {
-  "BS_Safari": {
+  "BS_Opera22": {
     "base": "BrowserStack",
     "os": "OS X",
     "os_version": "Yosemite",
-    "browser": "safari",
-    "browser_version": "8.0"
+    "browser": "opera",
+    "browser_version": "22.0"
   },
-  "BS_Safari": {
+  "BS_Chrome28": {
     "base": "BrowserStack",
     "os": "OS X",
     "os_version": "Mavericks",
-    "browser": "safari",
-    "browser_version": "7.0"
+    "browser": "chrome",
+    "browser_version": "28.0"
   },
-  "BS_Chrome": {
+  "BS_Safari8": {
     "base": "BrowserStack",
     "os": "OS X",
     "os_version": "Yosemite",
-    "browser": "chrome",
-    "browser_version": "49.0"
+    "browser": "safari",
+    "browser_version": "8.0"
   },
-  "BS_Firefox": {
+  "BS_Firefox25": {
     "base": "BrowserStack",
     "os": "OS X",
     "os_version": "Yosemite",
     "browser": "firefox",
-    "browser_version": "45.0"
-  },
-  "BS_MobileSafari": {
-    "base": "BrowserStack",
-    "os": "ios",
-    "os_version": "8.0",
-    "browser": "iphone",
-    "real_mobile": false
-  },
-  "BS_MobileSafari": {
-    "base": "BrowserStack",
-    "os": "ios",
-    "os_version": "9.0",
-    "browser": "iphone",
-    "real_mobile": false
-  },
-  "BS_Chrome": {
-    "base": "BrowserStack",
-    "os": "Windows",
-    "os_version": "8.1",
-    "browser": "chrome",
-    "browser_version": "49.0"
-  },
-  "BS_Firefox": {
-    "base": "BrowserStack",
-    "os": "Windows",
-    "os_version": "8.1",
-    "browser": "firefox",
-    "browser_version": "45.0"
+    "browser_version": "25.0"
   },
   "BS_InternetExplorer9": {
     "base": "BrowserStack",
@@ -76,11 +48,11 @@
     "browser": "ie",
     "browser_version": "11.0"
   },
-  "BS_Edge": {
+  "BS_Edge13": {
     "base": "BrowserStack",
     "os": "Windows",
     "os_version": "10",
     "browser": "edge",
-    "browser_version": "14"
+    "browser_version": "13.0"
   }
 }
diff --git a/package.json b/package.json
index 624da86e..cf5e92c9 100644
--- a/package.json
+++ b/package.json
@@ -49,6 +49,7 @@
     "babel-plugin-transform-es3-property-literals": "^6.8.0",
     "babel-preset-es2015": "^6.9.0",
     "babel-preset-stage-0": "^6.5.0",
+    "bowser": "^1.5.0",
     "cross-env": "^3.1.3",
     "es5-shim": "^4.5.9",
     "eslint": "^2.8.0",
diff --git a/src/index.test.js b/test/integration.test.js
similarity index 62%
rename from src/index.test.js
rename to test/integration.test.js
index 16a73416..426d54d5 100644
--- a/src/index.test.js
+++ b/test/integration.test.js
@@ -1,6 +1,7 @@
 import expect from 'expect.js'
 
-import {prefix, supportedProperty, supportedValue} from './index'
+import {prefix, supportedProperty, supportedValue} from '../src/index'
+import {browser} from './utils'
 
 describe('css-vendor', () => {
   describe('.prefix', () => {
@@ -22,11 +23,20 @@ describe('css-vendor', () => {
       expect(supportedProperty('display')).to.be('display')
     })
 
-    it('should prefix if needed', () => {
-      const prop = supportedProperty(`${prefix.css}animation`)
-      if (prop !== 'animation') {
-        expect(prop).to.be(`${prefix.css}animation`)
-      }
+    browser("requires prefix for transform property", {
+      msie: "9",
+      firefox: "3.5-15",
+      chrome: "4-35",
+      safari: "3.1-8",
+      opera: "11.5-22",
+      ios: "3.2-8.4",
+      android: "2.1-4.4.4",
+      blackberry: "7-10",
+      ucbrowser: "11",
+    }, () => {
+      it('should prefix', () => {
+        expect(supportedProperty('transform')).to.be(`${prefix.css}transform`)
+      })
     })
 
     it('should return false', () => {
@@ -44,11 +54,14 @@ describe('css-vendor', () => {
       expect(supportedValue('color', value)).to.be(value)
     })
 
-    it('should should prefix if needed', () => {
-      const value = supportedValue('display', 'flex')
-      if (value !== 'flex') {
-        expect(value).to.be(`${prefix.css}flex`)
-      }
+    browser("requires prefix for flex value", {
+      chrome: "21-28",
+      safari: "7-8",
+      ios: "7.1-8.4",
+    }, () => {
+      it('should prefix', () => {
+        expect(supportedValue('display', 'flex')).to.be(`${prefix.css}flex`)
+      })
     })
 
     it('should return false for unknown value', () => {
diff --git a/test/utils.js b/test/utils.js
new file mode 100644
index 00000000..c7f7e1ce
--- /dev/null
+++ b/test/utils.js
@@ -0,0 +1,15 @@
+import * as bowser from 'bowser'
+
+const version = parseFloat(bowser.version)
+
+export function browser(desc, browsers, cb) {
+  for (const b in browsers) {
+    if (bowser[b]) {
+      let [from, to] = browsers[b].split("-").map((x) => parseFloat(x))
+      if (to === undefined) to = from
+      if (version >= from && version <= to) return describe(desc, cb)
+      break
+    }
+  }
+  console.log(`skip "${desc}" for ${bowser.name} ${bowser.version}`)
+}
diff --git a/tests.webpack.js b/tests.webpack.js
index cfb66253..bf52a84a 100644
--- a/tests.webpack.js
+++ b/tests.webpack.js
@@ -1,2 +1,2 @@
-const context = require.context('./src', true, /\.test\.js$/)
+const context = require.context('./test', true, /\.test\.js$/)
 context.keys().forEach(context)