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<!DOCTYPE html> <html> <head> <title>Xem ví dụ</title> <style> #a{ border:3px solid blue; } #b{ width:300px; height:200px; background-color:green; float:left; } </style> </head> <body> <div id="a"> <div id="b"></div> <div style="clear:both"></div> </div> </html>
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