属性值设置为扩展的表达式。

The property value is set to the expanded expression.

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然而，也可以将required属性值设置为false来声明它们中的任何一个。

However, it is also possible to declare any of them as optional by setting the 'required' attribute to 'false'.

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在title元素下面创建一个名为type的属性，把属性值设置为text。

Create an attribute named type under the title element, and set attribute value to text.

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