About div layout issues_html/css_WEB-ITnose

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How can I put a div with id 4 Set to display in a row with a width of 100%
The div with id 2 can be hidden, so the div with id 4 must require a width of 100% before it can be adaptively expanded

Reply to the discussion (solution )

The div with id 5 is floating on the div with id 4, so it cannot be displayed in a row. You just need to remove the div with id 5.

I don’t understand. What's the meaning. . .