position:fixed; 是fixed的用法,配合overflow实现将一个元素定位到网页的一个位置上面,具体请看下面的例子:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> <head> <meta http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8"/> <meta name="Author" content="Stu Nicholls"/> <meta name="Keywords" content="Cascading, Style, Sheets, CSS1, CSS2, CSS, XHTML1.1, w3c, doing it with style, recommendations, opacity, box model, mozilla, opera, netscape, internet explorer, v6, v7.23, techniques, layout, three column, cutting edge, experimental, validation, validate, navigation, pop-up, pull-down, menus, tips, tricks, css mouseover, mouseovers, CSS Frames, CSS menu, CSS menus"/> <meta name="Description" content="CSS ~ Cutting edge Cascading Style Sheets. Experiments in CSS"/> <title> CSS position:fixed; for IE6</title> <style type="text/css">
html {}{background:#ccc;} body {}{margin:0; padding:0 10px 0 10px; border:0; height:100%; overflow:auto; background:#ccc;} body {}{font-family: georgia, serif; font-size:12px;} #page {}{margin:310px 0 50px 250px; display:block; width:500px; border:1px solid #000; background:#fff; padding:10px;}
#page .right {}{font-size:30px; float:right;} #menu {}{display:block; top:10px; left:10px; width:130px; position:fixed; border:1px solid #990000; padding:10px; text-align:center; font-weight:bold; color:#990000; background:#fff;} * html #menu {}{position:absolute;} #menu a:visited, #menu a {}{display:block; width:120px; height:20px; margin:0 auto; border-top:1px solid #fff; border-bottom:1px solid #000; text-align:center; text-decoration:none; line-height:20px; color:#CC0000;} #menu a:hover {}{background:#aaa; color:#fff;} .clear {}{clear:both;} </style> <!--[if IE 6]> <style type="text/css"> /*<![CDATA[*/ html {overflow-x:auto; overflow-y:hidden;} /*]]>*/ </style> <![endif]--> </head>
<body> <div id="page"> <div class="right">position:fixed;</div> <div class="clear"/> <a name="bites"/>
<div class="right">Another one bites the dust~</div> <div class="clear"/> <p>Well, they said it couldn't be done in IE6 because of a browser bug.</p> <p>But they didn't know that another bug works in a way that ALLOWS this to be done!</p> <p>This page has a fixed menu in the top left hand corner of the screen. This menu will remain on screen at all times in NN7, Opera, Mozilla, Firefox AND IE6!!</p> <p>Just scroll this page and see the menu pass over the top without so much as a flicker (not like those javascript things that jerk and jump down the screen trying to keep up with the scroll). In fact IE6 handles the scrolling better that Mozilla/Firefox.</p> <p>This is all done using standard CSS with a little help from another IE6 BUG that makes it believe that 'ABSOLUTE' is 'FIXED'.</p> <p>Just take a peek at the source code to see that all it takes is a setting of height:100% for the body (with overflow-y:auto) and it works.<br/> Anything that is position:absolute; or position:relative; will now be FIXED in IE6.</p> <p>The only problem with this is that you cannot use absolute or relative positions on the moving page but float is allowed.</p> <div class="right">and there you have it~</div> <div class="clear"/> <p>The rest of this page is just put in to fill up the space to extend the div out of the screen area</p> <p>Taking this to extremes you have <a href="http://www.cssplay.co.uk/layouts/frame.html">The Holy Grill</a></p>
<p>This page is <a href="http://validator.w3.org/check/referer">Valid XHTML1.1</a>.</p>
<p>?2004 Stuart A Nicholls ~all rights reserved (but help yourself to the code anyway ;)</p> <p>Back to the <a href="http://www.cssplay.co.uk/">Home Page</a>.</p> <p>Let's stuff a few images at the end to see if there is a problem in IE.</p> <p>Looks ok to me?</p> <a href="#bites">Goto 'Another one bites the dust'</a><br/>
</div> <div id="menu"> <a href="#" title="Dummy menu item">Mozilla</a> <a href="#" title="Dummy menu item">Opera</a> <a href="#" title="Dummy menu item">Netscape</a> <a href="#bites" title="Dummy menu item">Firefox</a> <a href="#" title="Dummy menu item">IE6</a> <a href="#" title="Dummy menu item">Windows</a> <a href="#" title="Dummy menu item">Style</a> <a href="#" title="Dummy menu item">CSS</a> <a href="http://www.cssplay.co.uk/comments/comments.php?comment_id=position%20fixed" title="Your comments">Comments</a> </div> </body> </html> 实现兼容IE6的方式:
<!--[if IE 6]> <style type="text/css"> /*<![CDATA[*/ html {overflow-x:auto; overflow-y:hidden;} /*]]>*/ </style> <![endif]--> CSS的精华部分在:
body {margin:0; padding:0 10px 0 10px; border:0; height:100%; overflow-y:auto; background:#ccc;}
#menu {display:block; top:10px; left:10px; width:130px; position:fixed;
* html #menu {position:absolute;}
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