The spacing of multiple divs with inline-block is different from the programming method_HTML/Xhtml_Web page production

When learning inline-block, I found that the spacing of multiple divs with border and inline-block will be different according to the programming method. When written as:

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The code is as follows:

....

.... ...

At this time, there is no spacing between divs.

If written as:

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The code is as follows:

.....

.....

At this time, between div There is spacing.