先看看代碼:
以下是引用片段：
<div id="info">
<h2>TRACKING YOUR IMAGES</h2>
<div id="holdit">
<img src="/imagelist/06/24/4fnpgj5042e6.jpg" alt="Winnie the pooh" title="WinnIE the pooh" />
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<p>"I shall have to wait until I catch up with it," said WinnIE-the-Pooh. "Now, look there." He pointed to the ground in front of him. "What do you see there?"<br />
"Tracks," said Piglet. "Paw-marks." He gave a little squeak of excitement. "Oh, Pooh! Do you think it's a--a--a Woozle?"<br />
"It may be," said Pooh. "Sometimes it is, and sometimes it isn't. You never can tell with paw- marks."<br />
With these few Words he went on tracking, and Piglet, after watching him for a minute or two, ran after him. WinnIE-the-Pooh had come to a sudden stop, and was bending over the tracks in a puzzled sort of way.<br />
"What's the matter?" asked Piglet.<br />
"It's a very funny thing," said Bear, "but there seem to be two animals now. This--whatever-it-was--has been joined by another--whatever-it-is--
and the two of them are now proceeding in company. Would you mind coming with me, Piglet, in case they turn out to be Hostile Animals?"<br />
Piglet scratched his ear in a nice sort of way, and said that he had nothing to do until Friday, and would be delighted to come, in case it really was a Woozle.<br />
"You mean, in case it really is two Woozles," said WinnIE-the-Pooh, and Piglet said that anyhow he had nothing to do until Friday. So off they went together.</p>
</div>
</div>
以下是引用片段：
#info h3{ text-align:center;
}
#holdit {width:700px; position:relative; margin:3em auto; padding:10px; border:1px solid #ddd;}
#holdit img {position:absolute; z-index:1; top:10px; left:10px; }
#holdit p { margin:0px; position:relative; z-index:10; line-height:18px; text-align:justify; font-size:10px; font-family:verdana, arial, sans-serif}
#holdit em {display:block; float:left; height:18px; clear:left; overflow:hidden; }
.a230 {width:230px;}
.a240 {width:240px;}
.a250 {width:250px;}
.a270 {width:270px;}
.a300 {width:300px;}
.a340 {width:340px;}
.a360 {width:360px;}
.a370 {width:370px;}
.a400 {width:400px;}
.a420 {width:420px;}
.a430 {width:430px;}
.a460 {width:460px;}
.a490 {width:490px;}
.a500 {width:500px;}
.a540 {width:540px;}
.a550 {width:550px;}
接著我們來分析一下紅色加亮的部分:
首先將包容對象#holdit設置成相對定位(確保等下的img絕對定位以它左上角為原點)
接著把#holdit裡面的img設成絕對定位且z-index高度為1，這樣img就脫離文檔流了
將em標簽設置左浮動，高度和p的ling-height要一樣，再根據圖片的圖案分別設置每個em的寬度(記得要用clear來清除浮動)
最後把P設置成相對定位且z-index高度設置大於img的數值
其實我們也可以直接將圖片作為為#holdit的背景，這樣就不需要專門為img來設置CSS了