[html]    一、背景设计模式
    <style type="text/css">
    div { background:#f00 url("images/heading2.jpg") no-repeat; width:250px; height:76px; }
    <h1>Background Image(背景设计模式)</h1>
    <style type="text/css">
    *.positioned { position:relative; }
    *.absolute { position:absolute; top:10px; left:10px; }
    <div class="positioned">
    <span class="absolute">Sized Absolute</span>
    <style type="text/css">
    *.positioned { border:1px solid red; height:100px; background-color:#ffee00; }
    *.absolute { border:4px solid green; background-color:white; }
    <style type="text/css">
    #h2 { position:relative; width:250px;height:76px; overflow:hidden; }
    #h2 span { position:absolute; width:250px; height:76px; top:0; left:0; background:#ff0 url("images/heading2.jpg") no-repeat; }
    <h1>Text Replacement(文本替换设计模式)</h1>
    <h2 id="h2">heading 2<span></span></h2>
    <style type="text/css">
    *.left-marginal { position:relative; margin-left:200px; }
    *.marginal-heading { position:absolute; top:0; left:-200px; margin:0; }
    <h1>Left Marginal(左旁注设计模式)</h1>
    <div class="left-marginal">
    <h2 class="marginal-heading">Heading</h2>
    You want to excerpt an element and move it into the left again.
    <style type="text/css">
    *.indent { position:relative; margin-left:120px; }
    *.graphic-dropcap { position:absolute; width:120px; height:90px; left:-120px; top:0; }
    *.graphic-dropcap span { position:absolute; width:120px; height:90px; margin:0; top:0; left:0; background:url(images/m.jpg) no-repeat; }
    <h1>Marginal Graphic Dropcap(旁注式图片下沉设计模式)</h1>
    <p class="indent">
    <span class="graphic-dropcap">M<span></span></span>
    arginal Graphic Dropcap. The letter M has been covered by the dropcap is image.Screen readers  read the text and visual users see the image.If the browser cannot display the dropcap image, the text becomes visible.