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CSS :empty 伪类
trycss_sel_empty
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<!DOCTYPE html> <html> <head> <style> .box { background-color: lightgreen; height: 90px; width: 90px; } .box:empty { background-color: salmon; } </style> </head> <body> <h1>Demo of :empty</h1> <div class="box"></div><br> <div class="box">I will be lightgreen.</div><br> <div class="box"><!-- I will be salmon --></div><br> <div class="box"> <!-- I will be lightgreen --> </div> </body> </html>