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False negative in History API support check on Windows Phone 8.1 #1471

gaearon opened this Issue Dec 11, 2014 · 1 comment


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gaearon commented Dec 11, 2014

Windows Phone 8.1 supports History API, but Modernizr gives a false negative.

The check in question returns false for Android 4.0 (presumably because it reports as supporting API but in fact doesn't?). However, Microsoft recently started including Android in WP user agent, leading Modernizr to believe it's an Android when in fact it's not.

Example of failing Windows Phone UA: "Mozilla/5.0 (Mobile; Windows Phone 8.1; Android 4.0; ARM; Trident/7.0; Touch; rv:11.0; IEMobile/11.0; Microsoft; Virtual) like iPhone OS 7_0_3 Mac OS X AppleWebKit/537 (KHTML, like Gecko) Mobile Safari/537". As you see, it contains Android 4.0.

The fix is to add additional check for Windows Phone like I do here:

   if ((ua.indexOf('Android 2.') !== -1 ||
       (ua.indexOf('Android 4.0') !== -1)) &&
       ua.indexOf('Mobile Safari') !== -1 &&
-      ua.indexOf('Chrome') === -1) {
+      ua.indexOf('Chrome') === -1 &&
+      ua.indexOf('Windows Phone') === -1) {
     return false;

This comment has been minimized.

alanhogan commented Dec 24, 2014

The dark side of the UA string wars. (Okay, it’s all dark)

patrickkettner pushed a commit to patrickkettner/Modernizr that referenced this issue Feb 22, 2015

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