fix cufon from https://github.com/oori/cufon/commit/a1e1d9157e21a11c065ee5dccefb1f844d7cfd51#commitcomment-837796

gistfile1.diff

@@ -339,6 +339,12 @@ var Cufon = (function() {
       return glyphs;
     })(data.glyphs);
 
+    this.missingGlyphs = '';
+    for (var i in this.glyphs) {
+      this.missingGlyphs += i;
+    }
+    this.missingGlyphsRegexp = new RegExp("[^" + this.missingGlyphs.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&") + "]");
+
     this.w = data.w;
     this.baseSize = parseInt(face['units-per-em'], 10);
 
@@ -618,6 +624,10 @@ var Cufon = (function() {
       if (/\s$/.test(text)) parts.push('');
     }
     for (var i = 0, l = parts.length; i < l; ++i) {
+      if (font.missingGlyphsRegexp.test(parts[i])) {
+        fragment.appendChild(document.createTextNode(parts[i]));
+        continue;
+      }
       processed = engines[options.engine](font,
         needsAligning ? CSS.textAlign(parts[i], style, i, l) : parts[i],
         style, options, node, el, i < l - 1);