有时，在装载网页时，我们需要制作一个进度条，实际上，这个进度条完全可以使用CSS来实现，下面就给促具体的代码：

CSS源代码如下：<style>#graphbox{border:1px solid #e7e7e7;padding:10px;width:250px;background-color:#f8f8f8;margin:5px 0;}#graphbox h2{color:#666666;font-family:Arial;font-size:18px;font-weight:700;}.graph{position:relative;background-color:#F0EFEF;border:1px solid #cccccc;padding:2px;font-size:13px;font-weight:700;}.graph .orange, .green, .blue, .red, .black{position:relative;text-align:left;color:#ffffff;height:18px;line-height:18px;font-family:Arial;display:block;}.graph .orange{background-color:#ff6600;}.graph .green{background-color:#66CC33;}.graph .blue{background-color:#3399CC;}.graph .red{background-color:red;}.graph .black{background-color:#555;}</style>

HTML文档部分源代码如下：

<div id="graphbox"><h2>BarGraphs Example</h2><div class="graph"><span class="orange" style="width:35%;">orange:35%</span></div><div class="graph"><span class="green" style="width:90%;">green:90%</span></div><div class="graph"><span class="blue" style="width:75%;">blue:75%</span></div><div class="graph"><span class="red" style="width:85%;">red:85%</span></div><div class="graph"><span class="black" style="width:100%;">black:100%</span></div></div>