It mainly discusses its structure and some important properties. I will introduce it in a way that slowly improves.
1) The basic structure is as follows: <tr> represents a row in the table, and <td> represents a column in a row. Say one, it's OK
Think of it as a cell in word. <th> is actually a cell, but it is used as a table title. Semantically
Say: <td> represents the data unit in the table, and <th> represents the title of a column or row in the table.
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