应用程序需要将元素内容中的空白报告成可忽略的。
Relies on whitespace in element content to be reported as ignorable.
非可视化用户代理不需要顾忌在PRE元素内容中额外的空白。
Non-visual user agents are not required to respect extra white space in the content of a PRE element.
非可视化用户代理不需要顾忌在PRE元素内容中额外的空白。
Non-visual user agents are not required to respect extra white space in the content of a PRE element.
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