~82 style of table

1、border-spacing Specify the distance between borders

2、border-collapse Set the merge of borders （ The default value is collapse）

3、 If not used in the form tbody, But directly tr

The browser will automatically create a tbody, And will tr Put it all in tbody in ,tr Not at all table Child elements

4、 By default , The elements are in td The middle is vertically centered , Can pass vertical-align To set up

5、 The horizontal position can be through text-align To set up

6、 display: table-cell; Set element to cell

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