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      1 // Copyright 2014 Google Inc. All rights reserved.
      2 //
      3 // Licensed under the Apache License, Version 2.0 (the "License");
      4 // you may not use this file except in compliance with the License.
      5 //   You may obtain a copy of the License at
      6 //
      7 // http://www.apache.org/licenses/LICENSE-2.0
      8 //
      9 // Unless required by applicable law or agreed to in writing, software
     10 // distributed under the License is distributed on an "AS IS" BASIS,
     11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     12 //   See the License for the specific language governing permissions and
     13 // limitations under the License.
     14 
     15 (function(scope) {
     16   function parse(string) {
     17     var out = Number(string);
     18     if (isNaN(out) || out < 100 || out > 900 || out % 100 !== 0) {
     19       return;
     20     }
     21     return out;
     22   }
     23 
     24   function toCss(value) {
     25     value = Math.round(value / 100) * 100;
     26     value = scope.clamp(100, 900, value);
     27     if (value === 400) {
     28       return 'normal';
     29     }
     30     if (value === 700) {
     31       return 'bold';
     32     }
     33     return String(value);
     34   }
     35 
     36   function merge(left, right) {
     37     return [left, right, toCss];
     38   }
     39 
     40   scope.addPropertiesHandler(parse, merge, ['font-weight']);
     41 
     42 })(webAnimations1);
     43