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CSS 参考手册
CSS :out-of-range 选择器
trycss_sel_out-of-range
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<!DOCTYPE html> <html> <head> <style> input:out-of-range { border: 2px solid red; } </style> </head> <body> <h1>Demo of the :out-of-range selector</h1> <input type="number" min="5" max="10" value="17"> <p>Try typing a number within the given range (between 5 and 10), to see the styling disappear.</p> </body> </html>