If an element has this attribute with a value of 1.0, then the BC feature is enabled for the element itself and the sub-tree within it.
如果一个元素包含该属性，并且值为1.0，则对该元素本身及其中的子树启用bc特性。
If an element has this attribute with a value of 1.0, then the BC feature is enabled for the element itself and the sub-tree within it.
如果一个元素包含该属性，并且值为1.0，则对该元素本身及其中的子树启用bc特性。
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