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<!DOCTYPE html> <html> <head> <style> #t1 { -moz-tab-size: 4; /* Firefox */ tab-size: 4; } #t2 { -moz-tab-size: 16; /* Firefox */ tab-size: 16; } </style> </head> <body> <h1>tab-size 属性</h1> <pre id="t1"> I use tab-size 4 </pre> <pre id="t2"> I use tab-size 16 </pre> <p><strong>注意：</strong> Firefox 支持另一种选择，即 -moz-tab-size 属性。</p> </body> </html>