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                ## em 單位參照父元素的字體大小 比如 ``` { width:20em; } ``` ## 那么css里 width里參照的是他的父元素里 字體大小 ``` 字體大小*20em= px; 瀏覽器默認大小是16px 那么20em就是 320PX; ``` ## rem ``` 參照根元素字體的大小,不是參照父元素 ``` html 默認為16px; ``` 字體大小*20em= px; 瀏覽器默認大小是16px 那么20em就是 320PX; ``` 代碼案例: ~~~ <style> .dy1{ width:20em; height:10em; background-color: brown; } </style> </head> <body> <div class="dy1"></div> </body> ~~~
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