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  1. ```5.1 标准文档流
  2. 标准文档流:指在不使用其他与排列和定位相关的特殊CSS规则时,各种元素的排列规则;
  3. 5.2 块级元素 VS 行内元素
  4. 块级元素:以一个块的形式展现,跟同级的兄弟块依次竖直排列,左右撑满,比如<div>;
  5. 行内元素:以普通的一个 DOM 节点展现,跟同级的兄弟元素横向排列,排满后,自动换行,比如<span>;
  6.  
  7. <h1>块级元素</h1>
  8. <div>块1</div>
  9. <div>块2</div>
  10. <div>块3</div>
  11. <h1>行内元素</h1>
  12. <span>块1</span>
  13. <span>块2</span>
  14. <span>块3</span>
  15. </body>```
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