📄 pr_pos_left.asp
字号:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html lang="en-US" xml:lang="en-US" xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>CSS Left Property</title>
<link rel="shortcut icon" href="../favicon.ico" type="image/x-icon" />
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<meta name="Keywords" content="xml,tutorial,html,dhtml,css,xsl,xhtml,javascript,asp,ado,vbscript,dom,sql,colors,soap,php,authoring,programming,training,learning,beginner's guide,primer,lessons,school,howto,reference,examples,samples,source code,tags,demos,tips,links,FAQ,tag list,forms,frames,color table,w3c,cascading style sheets,active server pages,dynamic html,internet,database,development,Web building,Webmaster,html guide" />
<meta name="Description" content="Free HTML XHTML CSS JavaScript DHTML XML DOM XSL XSLT RSS AJAX ASP ADO PHP SQL tutorials, references, examples for web building." />
<meta http-equiv="pragma" content="no-cache" />
<meta http-equiv="cache-control" content="no-cache" />
<link rel="stylesheet" type="text/css" href="../stdtheme.css" />
<script type="text/javascript">
var gaJsHost = (("https:" == document.location.protocol) ? "../../https@ssl./default.htm" : "../../www./default.htm");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
</script>
<script type="text/javascript">
var pageTracker = _gat._getTracker("UA-3855518-1");
pageTracker._initData();
pageTracker._trackPageview();
</script>
</head>
<body>
<a name="top"></a>
<table cellpadding="0" cellspacing="0" width="100%" bgcolor="#808080">
<tr>
<td width="234" valign="top">
<a href="../default.htm"><img src="../images/w3default80.jpg" border="0" alt="W3Schools" /></a>
</td>
<th valign="middle" align="left" class="right">
<iframe style="background-color:#808080" src="../banners/bannerframe.asp@adpartner=aspall2" height="90" width="728"
marginwidth="0" marginheight="0" frameborder="0" scrolling="no">
Your browser does not support inline frames or is currently configured not to display inline frames.
</iframe>
<br /></th>
</tr>
</table>
<table style="margin-left:1px" width="800px" border="0" cellpadding="0" cellspacing="2">
<tr>
<td width="137" class="content" valign="top"><br />
<a class="left" href="../default.asp" target="_top">
<img src="../images/homeicon.gif" border="0" alt="home" /></a>
<a class="left" href="../default.asp" target="_top">
<b>HOME</b></a>
<br /><br />
<b>CSS Basic</b><br />
<a class="left" target="_top" href="default.asp" >CSS HOME</a><br />
<a class="left" target="_top" href="css_intro.asp" >CSS Introduction</a><br />
<a class="left" target="_top" href="css_syntax.asp" >CSS Syntax</a><br />
<a class="left" target="_top" href="css_howto.asp" >CSS How To</a><br />
<a class="left" target="_top" href="css_background.asp" >CSS Background</a><br />
<a class="left" target="_top" href="css_text.asp" >CSS Text</a><br />
<a class="left" target="_top" href="css_font.asp" >CSS Font</a><br />
<a class="left" target="_top" href="css_border.asp" >CSS Border</a><br />
<a class="left" target="_top" href="css_outline.asp" >CSS Outline</a><br />
<a class="left" target="_top" href="css_margin.asp" >CSS Margin</a><br />
<a class="left" target="_top" href="css_padding.asp" >CSS Padding</a><br />
<a class="left" target="_top" href="css_list.asp" >CSS List</a><br />
<a class="left" target="_top" href="css_table.asp" >CSS Table</a><br />
<br />
<b>CSS Advanced</b><br />
<a class="left" target="_top" href="css_dimension.asp" >CSS Dimension</a><br />
<a class="left" target="_top" href="css_classification.asp" >CSS Classification</a><br />
<a class="left" target="_top" href="css_positioning.asp" >CSS Positioning</a><br />
<a class="left" target="_top" href="css_pseudo_classes.asp" >CSS Pseudo-class</a><br />
<a class="left" target="_top" href="css_pseudo_elements.asp" >CSS Pseudo-element</a><br />
<a class="left" target="_top" href="css_image_gallery.asp" >CSS Image Gallery</a><br />
<a class="left" target="_top" href="css_image_transparency.asp" >CSS Image Opacity</a><br />
<a class="left" target="_top" href="css_mediatypes.asp" >CSS Media Types</a><br />
<a class="left" target="_top" href="css_dont.asp" >CSS Don't</a><br />
<a class="left" target="_top" href="css_summary.asp" >CSS Summary</a><br />
<br />
<b>CSS Examples</b><br />
<a class="left" target="_top" href="css_examples.asp" >CSS Examples</a><br />
<br />
<b>References</b>
<br />
<a class="left" target="_top" href="css_reference.asp" >CSS2 Reference</a><br />
<a class="left" target="_top" href="css_ref_print.asp" >CSS2 Print</a><br />
<a class="left" target="_top" href="css_ref_aural.asp" >CSS2 Aural</a><br />
<a class="left" target="_top" href="css_units.asp" >CSS Units</a><br />
<a class="left" target="_top" href="css_colors.asp" >CSS Colors</a><br />
<a class="left" target="_top" href="css_colorsfull.asp" >CSS Colorvalues</a><br />
<a class="left" target="_top" href="css_colornames.asp" >CSS Colornames</a><br />
<br />
<b>CSS Quiz</b><br />
<a class="left" target="_top" href="css_quiz.asp" >CSS Quiz</a><br />
<a class="left" target="_top" href="css_exam.asp" >CSS Exam</a><br />
<br />
<b>Selected Reading</b><br />
<a class="left" target="_top" href="../browsers/browsers_stats.asp">Web Statistics</a><br />
<a class="left" target="_top" href="../site/site_glossary.asp">Web Glossary</a><br />
<a class="left" target="_top" href="../hosting/default.asp">Web Hosting</a><br />
<a class="left" target="_top" href="../quality/default.asp">Web Quality</a><br /><br />
<a class="left" target="_top" href="../forum/default.asp">W3Schools Forum</a><br /><br />
<a class="left" target="_top" href="../about/about_helping.asp">Helping W3Schools</a><br /><br />
<script type="text/javascript"><!--
google_ad_client = "pub-3440800076797949";
/*LeftLinkUnit*/
google_ad_slot = "4854527104";
google_ad_width = 120;
google_ad_height = 90;
//-->
</script>
<script type="text/javascript"
src="../../pagead2.googlesyndication.com/pagead/show_ads.js">
</script>
</td>
<td valign="top">
<table style="border: 1px solid gray" width="100%" bgcolor="#FFFFFF" border="0" cellpadding="5" cellspacing="0">
<tr>
<td>
<h1>CSS left Property</h1>
<hr />
<a href="css_reference.asp"><img class="navup" src="../images/up.gif" alt="CSS Reference" border="0" /> Complete CSS Reference</a>
<hr />
<h2>Definition</h2>
<p>The left property specifies the left edge of an element.</p>
<p><b>Note:</b> If the "position" property has a value of
"static", the "left" property has no effect. </p>
<p><b>Inherited:</b> No</p>
<hr />
<h2><b>JavaScript Syntax</b></h2>
<p>CSS properties can also be dynamically changed with a JavaScript.</p>
<p><b>Scripting Syntax:</b> <i>object</i>.style.left="100px"</p>
<p>In our HTML DOM tutorial you can find more details about the
<a href="../htmldom/prop_style_left.asp">left property</a>.</p>
<p>In our HTML DOM tutorial you can also find a full
<a href="../htmldom/dom_obj_style.asp">Style Object Reference</a>.</p>
<hr />
<h2>Example</h2>
<table class="ex" cellspacing="0" border="1" width="100%" cellpadding="3">
<tr>
<td valign="top">
<p>
This example sets the left edge of the paragraph 20 px <b>to the right</b>
of the left edge of the window:<br />
p<br />
{<br />
position: absolute;<br />
left: 20px<br />
}</p>
<p>
This example sets the left edge of the paragraph 20 px <b>to the left</b>
of the left edge of the window:<br />
p<br />
{<br />
position: absolute;<br />
left: -20px<br />
}</p>
</td>
</tr>
</table>
<h2>Possible Values</h2>
<table class="ex" cellspacing="0" border="1" width="100%" cellpadding="3">
<tr>
<th align="left" valign="top">Value</th>
<th align="left" valign="top">Description</th>
</tr>
<tr>
<td valign="top">auto</td>
<td valign="top">Default. Lets the browser calculate the left position</td>
</tr>
<tr>
<td valign="top"><i>%</i></td>
<td valign="top">Sets the left position in % from the left edge of the
window</td>
</tr>
<tr>
<td valign="top"><i>length</i></td>
<td valign="top">Sets the left position in px, cm, etc. from the left edge of
the window. Negative values are allowed
</td>
</tr>
</table>
<br />
<hr />
<h2>Try-It-Yourself Demos</h2>
<p><a target="_blank" href="tryit.asp@filename=trycss_position_left">Set the
left edge of an image using a pixel value</a><br />
This example demonstrates how to set the left edge of an element using a pixel
value.</p>
<p><a target="_blank" href="tryit.asp@filename=trycss_position_left_percent">Set
the left edge of an image using a percent value</a><br />
This example demonstrates how to set the left edge of an element using a percent
value.</p>
<p><a target="_blank" href="tryit.asp@filename=trycss_zindex2">Z-index</a><br />
Z-index can be used to place an element "behind" another element.</p>
<p><a target="_blank" href="tryit.asp@filename=trycss_zindex1">Z-index</a><br />
The elements in the example above have now changed their Z-index.</p>
<hr />
<a href="css_reference.asp"><img class="navup" src="../images/up.gif" alt="CSS Reference" border="0" /> Complete CSS Reference</a>
<br />
<hr />
<!-- **** SPOTLIGHTS 1 **** -->
<iframe src="../banners/aspallframe.asp" height="110" width="485"
marginwidth="0" marginheight="0" frameborder="0" scrolling="no">
Your browser does not support inline frames or is currently configured not to display inline frames.
</iframe>
<hr />
<!-- **** SPOTLIGHTS 2 **** -->
<h2>Learn XML with <oXygen/> XML Editor - Free Trial!</h2>
<table cellpadding="0"><tr>
<td valign="top"><a target="_blank" href="../../www.oxygenxml.com/default.htm">
<img src="../images/oxygenxml.png" border="0" alt="oXygen - Probably The World's Best XML Editor" /></a></td>
<td> </td>
<td valign="top">
<p><a href="../../www.oxygenxml.com/default.htm" target="_blank">oXygen</a> helps you learn to define,
edit, validate and transform XML documents. Supported technologies include XML Schema,
DTD, Relax NG, XSLT, XPath, XQuery, CSS.</p>
<p>Understand in no time how XSLT and XQuery work by using the intuitive oXygen debugger!</p>
<p>Do you have any XML related questions? Get free answers from the oXygen
<a href="../../www.oxygenxml.com/forum/default.htm" target="_blank">XML forum</a>
and from the <a href="../../www.oxygenxml.com/documentation.html" target="_blank">video</a>
demonstrations.</p>
<p><b><a href="../../www.oxygenxml.com/download.html" target="_blank">
Download a FREE 30-day trial today!</a></b></p>
</td></tr></table>
<hr />
<!-- **** SPOTLIGHTS 3 **** -->
<table cellpadding="0" cellspacing="0"><tr><td width="72"></td><td>
<script type="text/javascript"><!--
google_ad_client = "pub-3440800076797949";
/*txt*/
google_ad_slot = "1699448869";
google_ad_width = 336;
google_ad_height = 280;
//-->
</script>
<script type="text/javascript"
src="../../pagead2.googlesyndication.com/pagead/show_ads.js">
</script>
</td></tr></table>
<hr />
<center>
<script type="text/javascript"><!--
google_ad_client = "pub-3440800076797949";
/*imgtxt*/
google_ad_slot = "8606855891";
google_ad_width = 468;
google_ad_height = 60;
//-->
</script>
<script type="text/javascript"
src="../../pagead2.googlesyndication.com/pagead/show_ads.js">
</script>
</center>
<hr />
<!-- **** END SPOTLIGHTS **** -->
</td></tr>
<tr><td>
<p>Jump to: <a href="#top" target="_top"><b>Top of Page</b></a>
or <a href="../default.asp" target="_top"><b>HOME</b></a> or
<a href='pr_pos_left.asp@output=print' target="_blank">
<img src="../images/print.gif" alt="Printer Friendly" border="0" />
<b>Printer friendly page</b></a></p>
<p>W3Schools provides material for training only. We do not warrant the correctness of its contents.
The risk from using it lies entirely with the user.
While using this site, you agree to have read and accepted our
<a href="../about/about_copyright.asp">terms of use</a> and
<a href="../about/about_privacy.asp">privacy policy</a>.
</p>
<p><a href="../about/about_copyright.asp">Copyright 1999-2008</a> by Refsnes Data. All Rights Reserved.</p>
<table border="0" width="100%" cellspacing="0" cellpadding="0"><tr>
<td width="60%" align="left">
<a href="../../validator.w3.org/check@uri=referer" target="_blank">
<img src="../images/vxhtml.gif" alt="Validate" width="88" height="31" border="0" /></a>
<a href="../../jigsaw.w3.org/css-validator/check@uri=referer" target="_blank">
<img src="../images/vcss.gif" alt="Validate" width="88" height="31" border="0" /></a>
<a href="../../www.w3.org/WAI/WCAG1A-Conformance" title="Explanation of Level A Conformance" target="_blank">
<img src="../images/wai.gif" alt="W3C-WAI level A conformance icon" width="88" height="31" border="0" /></a>
</td>
<td>
<a href="../xhtml/xhtml_howto.asp" target="_top">W3Schools was converted to XHTML in December 1999</a>
</td></tr>
</table>
</td></tr>
</table>
</td>
<td width="145" align="center" valign="top">
<iframe style="background-color:#f1f1f1" src="../banners/rightcolumn.asp@secid=css" height="1500" width="147"
marginwidth="0" marginheight="0" frameborder="0" scrolling="no">
</iframe>
</td>
</tr></table>
</body>
</html>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -