Merge pull request #352 from typekit/pz-disable-native-font-loading-safari10

Disable native font loading in Safari 10

Author: pzula

spec/core/fontwatcher_spec.js

@@ -74,6 +74,12 @@ describe('FontWatcher', function () {
         spyOn(FontWatcher, 'getUserAgent').andReturn('Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:43.0) Gecko/20100101 Firefox/43.0');
         expect(FontWatcher.shouldUseNativeLoader()).toEqual(true);
       });
+
+      it('is disabled on Safari > 10', function () {
+        spyOn(FontWatcher, 'getUserAgent').andReturn('Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/602.2.14 (KHTML, like Gecko) Version/10.0.1 Safari/602.2.14');
+        spyOn(FontWatcher, 'getVendor').andReturn('Apple');
+        expect(FontWatcher.shouldUseNativeLoader()).toEqual(false);
+      });
     });
   }
 

src/core/fontwatcher.js

@@ -40,6 +40,13 @@ goog.scope(function () {
     return window.navigator.userAgent;
   };
 
+  /**
+   * @return {string}
+   */
+  FontWatcher.getVendor = function () {
+    return window.navigator.vendor;
+  };
+
   /**
    * Returns true if this browser has support for
    * the CSS font loading API.
@@ -50,9 +57,12 @@ goog.scope(function () {
     if (FontWatcher.SHOULD_USE_NATIVE_LOADER === null) {
       if (!!window.FontFace) {
         var match = /Gecko.*Firefox\/(\d+)/.exec(FontWatcher.getUserAgent());
+        var safari10Match = /OS X.*Version\/10\..*Safari/.exec(FontWatcher.getUserAgent()) && /Apple/.exec(FontWatcher.getVendor());
 
         if (match) {
           FontWatcher.SHOULD_USE_NATIVE_LOADER = parseInt(match[1], 10) > 42;
+        } else if (safari10Match) {
+          FontWatcher.SHOULD_USE_NATIVE_LOADER = false;
         } else {
           FontWatcher.SHOULD_USE_NATIVE_LOADER = true;
         }