CSS3 ?? ??
CSS3 ?? ??
CSS3 ?? ?? ???? ??(padding)? ???(border)? ?????.
CSS3 ?? ?? ?? ??? ???? ???
????? ??? ??? ??? ??? ?? ?????.
??(??) + ??(??) + ???(???) = ?? ?? ??
??(??) + ??(?? ??) + ???(???) = ??? ?? ??
?, ??? ??/??? ??? ? ??? ?? ?? ??? ??? ?????. ? ?? ????(??? ???? ??? ??/??? ???? ?????).
? ???? ? <div> ??? ??? ?? ??? ????? div2? ??? ???? ??? ?? ???? ??? ???? ????.
?
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文網(wǎng)(php.cn)</title>
<style>
.div1 {
width: 300px;
height: 100px;
border: 1px solid blue;
}
.div2 {
width: 300px;
height: 100px;
padding: 50px;
border: 1px solid red;
}
</style>
</head>
<body>
<div class="div1">這個是個較小的框 (width 為 300px ，height 為 100px)。</div>
<br>
<div class="div2">這個是個較大的框 (width 為 300px ，height 為 100px)。</div>
</body>
</html>?? ??? ??? ???
? ??? ???? ? ?? ??? ?? ??? ????? ???? ??? ??? ???? ???.
CSS3? ?? ?? ?? ??? ? ??? ?? ? ?????.
CSS3 box-sizing ?? ??
CSS3 box-sizing ???? ??? ??? ??? ??(padding)? ???(border)? ?????.
??? box-sizing: border-box;? ???? ??? ??(padding)? ???(border)? ??? ??? ?????.
?
??? ? ??< ??? ????. ;div> ??? box-sizing: border-box; ??? ?????.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文網(wǎng)(php.cn)</title>
<style>
.div1 {
width: 300px;
height: 100px;
border: 1px solid blue;
box-sizing: border-box;
}
.div2 {
width: 300px;
height: 100px;
padding: 50px;
border: 1px solid red;
box-sizing: border-box;
}
</style>
</head>
<body>
<div class="div1">兩個 div 現(xiàn)在是一樣大小的!</div>
<br>
<div class="div2">php中文網(wǎng)!</div>
</body>
</html>???? ??? ???
box-sizing: border-box; ??? ? ????. ?? ?? ?? ????? ??? ????.
?? ??? ?? ??? ??? ?? ???? ???? ??? ? ????. ?? ????? ?? box-sizing: border-box; ? ?????. (??? ??? ????. ??? ??? width: 100%? ?? ??? ??? ??? ??? ????.)
?? ??? ?? ?? ??? ???? ?? ????.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文網(wǎng)(php.cn)</title>
<style>
* {
box-sizing: border-box;
}
input, textarea {
width: 100%;
}
</style>
</head>
<body>
<form action="action_page.php">
用戶名:<br>
<input type="text" name="username" value="php"><br>
郵箱:<br>
<input type="text" name="email" value="429240967@qq.com"><br>
評論:<br>
<textarea name="message" rows="5" cols="30">
</textarea>
<br><br>
<input type="submit" value="Submit">
</form>
<p><strong>提示：</strong> 可以嘗試移除樣式中的 box-sizing 屬性，看看會發(fā)生什么。注意移除后部分瀏覽器 input, textarea, 和 submit 按鈕的寬度不一致。</p>
</body>
</html>???? ??? ???
