input text 強制轉大寫 or 小寫

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<input type="text" name="hostname" onblur="this.value = this.value.toLowerCase();">
<input type="text" name="macaddress" onblur="this.value = this.value.toUpperCase();">

<input type="text" name="hostname" onblur="this.value = this.value.toLowerCase();"> <input type="text" name="macaddress" onblur="this.value = this.value.toUpperCase();">