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The step attribute, when present, must also have an integer value.
当出现step时，它也必须是整数值。
youdao
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When present, all of the extensions listed in this table must be present.
如果存在，则下面表格列出的所有扩展都必须存在。
youdao
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When present, all of the extensions listed in this table must be present.
如果存在，则下面表格列出的所有扩展都必须存在。
youdao