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下面的代碼中畫橫線的部分是什么意思???

下面的代碼中畫橫線的部分是什么意思啊?

三蘅 2016-07-29 13:57:33
<!DOCTYPE html><html>?? ?<head>?? ??? ?<title>Styling Submit Buttons</title>?? ??? ?<style type="text/css">?? ??? ??? ?input {?? ??? ???????? font-size: 120%;?? ??? ??? ??? ?color: #5a5854;?? ??? ??? ??? ?background-color: #f2f2f2;?? ??? ??? ??? ?border: 1px solid #bdbdbd;?? ??? ??? ??? ?border-radius: 5px;?? ??? ??? ??? ?padding: 5px 10px 5px 10px;?? ??? ???????????????????????? background-repeat: no-repeat;?? ??? ???????? background-position: 8px 9px;?? ??? ??? ??? ???????? display: block;?? ??? ??? ??? ???????????????????????? margin-bottom: 10px;}?? ??? ??? ?input#submit {?? ??? ??? ??? ?color: #444444;?? ??? ??? ??? ???????? text-shadow: 0px 1px 1px #ffffff;?? ??? ??? ??? ?border-bottom: 2px solid #b2b2b2;?? ??? ??? ??? ?background-color: #b9e4e3;?? ??? ??? ??? ???????? background: -webkit-gradient(linear, left top, left bottom, from(#beeae9), to(#a8cfce));?? ??? ??? ??? ?background: -moz-linear-gradient(top, #beeae9, #a8cfce);?? ??? ??? ??? ?background: -o-linear-gradient(top, #beeae9, #a8cfce);?? ??? ??? ??? ???????? background: -ms-linear-gradient(top, #beeae9, #a8cfce);}?? ??? ??? ?input#submit:hover {?? ??? ??? ??? ?color: #333333;?? ??? ??? ??? ?border: 1px solid #a4a4a4;?? ??? ??? ??? ?border-top: 2px solid #b2b2b2;?? ??? ??? ??? ?background-color: #a0dbc4;?? ??? ??? ??? ?background: -webkit-gradient(linear, left top, left bottom, from(#a8cfce), to(#beeae9));?? ??? ??? ??? ?background: -moz-linear-gradient(top, #a8cfce, #beeae9);?? ??? ??? ??? ?background: -o-linear-gradient(top, #a8cfce, #beeae9);?? ??? ??? ??? ?background: -ms-linear-gradient(top, #a8cfce, #beeae9);}?? ??? ?</style>?? ?</head>?? ?<body>?? ??? ?<form>?? ??? ??? ?<input type="submit" value="Register" id="submit" />?? ??? ?</form>?? ?</body></html>
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田心楓

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