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说明：
剩余空间分配数
fr单位被用于在一系列长度值中分配剩余空间，如果多个已指定了多个部分，则剩下的空间根据各自的数字按比例分配。
兼容性：
| IE | Firefox | Chrome | Safari | Opera | iOS Safari | Android Browser | Android Chrome |
|---|---|---|---|---|---|---|---|
| 6.0-11.0 | 2.0-38.0 | 4.0-43.0 | 3.1-8.1 | 15.0-28.0 | 3.2-8.1 | 2.1-4.4.4 | 18.0-40.0 |
示例：
border-parts: 10px 1fr 10px; border-parts: 10px 1fr 10px 1fr 10px; border-parts: 10px 2fr 10px 2fr 10px;