These elements are all extended from the section heading class in the base topic, which allows a single heading element to contain multiple paragraphs.
这些元素都是从基础主题中的节标题（sectionheading）类扩展而来，这允许单个标题元素包含多个段落。
These elements are all extended from the section heading class in the base topic, which allows a single heading element to contain multiple paragraphs.
这些元素都是从基础主题中的节标题（sectionheading）类扩展而来，这允许单个标题元素包含多个段落。
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