CSS input 背景提示

/* 通用 */::-webkit-input-placeholder { color:#f00; }::-moz-placeholder { color:#f00; } /* firefox 19+ */:-ms-input-placeholder { color:#f00; } /* ie */input:-moz-placeholder { color:#f00; }/* webkit專用 */#field2::-webkit-input-placeholder { color:#00f; }#field3::-webkit-input-placeholder { color:#090; background:lightgreen; text-transform:uppercase; }#field4::-webkit-input-placeholder { font-style:italic; text-decoration:overline; letter-spacing:3px; color:#999; }/* mozilla專用 */#field2::-moz-placeholder { color:#00f; }#field3::-moz-placeholder { color:#090; background:lightgreen; text-transform:uppercase; }#field4::-moz-placeholder { font-style:italic; text-decoration:overline; letter-spacing:3px; color:#999; }

<p><input  autofocus="autofocus" id="field1" name="fname" type="text" placeholder="請輸入你的姓名..." /></p>
<p><input id="field2" name="lname" type="text" placeholder="請輸入你的暱稱..." /></p>
<p><input id="field3" name="pass" type="password" placeholder="請輸入你的新密碼..." /></p>
<p><input id="field4" name="pass2" type="password" placeholder="請再次輸入你的新密碼..." /></p>

http://www.webhek.com/html5-placeholder-css/