,

...;

3. Inline elements: Default is in one line Arranged in the horizontal direction, the width and height are determined by the content and cannot be set. For example, ...;

4. Replace elements: The content of the element is determined by the label. attribute to set, the label is actually a placeholder, for example

5. Non-replacement element: The element content contains the current In tags, such as

,

,

6. How to distinguish replacement and non-replacement elements?

6-1. Replacement elements are because of the element content It comes from external resources, so most of them only need one tag, because there are many single tags, but there are exceptions, such as:

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