code: function sanitizeStyle(value) {
  	        value = String(value).trim(); // Make sure it's actually a string.
  	        if (!value)
  	            return '';
  	        // Single url(...) values are supported, but only for URLs that sanitize cleanly. See above for
  	        // reasoning behind this.
  	        var urlMatch = value.match(URL_RE);
  	        if ((urlMatch && sanitizeUrl(urlMatch[1]) === urlMatch[1]) ||
  	            value.match(SAFE_STYLE_VALUE) && hasBalancedQuotes(value)) {
  	            return value; // Safe style values.
  	        }
  	        if (_angular_core.isDevMode()) {
  	            getDOM().log("WARNING: sanitizing unsafe style value " + value + " (see http://g.co/ng/security#xss).");
  	        }
  	        return 'unsafe';
  	    }
docs: Sanitizes the given untrusted CSS style property value (i.e. not an entire object, just a single
  value) and returns a value that is safe to use in a browser environment.