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要创建一个HTML流程图，你可以使用HTML、CSS，不过，对于简单的流程图，你也可以直接使用HTML和CSS来手动布局。下面是一个使用纯HTML和CSS创建简单流程图的示例：
效果图
html
<!DOCTYPE html>
<html>
<head><link href="draw.css" rel="stylesheet" /><script src="draw.js" type="text/javascript"></script>
</head>
<body><div class="diamond" style="top:100px;left: 100px;"><span class="diamond-text">开始</span></div><!-- 下箭头 --><div class="arrow-down" style="top:195px;left:140px;"><span></span></div><div class="rectangle" style="top:275px;left: 100px;"><span class="rectangle-text">步骤一</span></div><div class="arrow-down" style="top:325px;left:140px;"><span></span></div><div class="rectangle" style="top:405px;left: 100px;"><span class="rectangle-text">步骤二</span></div><div class="arrow-down" style="top:455px;left:140px;"><span></span></div><div class="diamond" style="top:550px;left: 100px;"><span class="diamond-text">分叉节点</span></div><div><div class="arrow-down" style="top:645px;left:140px;"><span></span></div><div class="rectangle" style="top:725px;left: 100px;"><span class="rectangle-text">步骤三</span></div></div><div><div class="arrow-horizontal-down" style="top:590px;left:205px;"><div></div><span></span></div><div class="rectangle" style="top:725px;left: 220px;"><span class="rectangle-text">步骤四</span></div><div class="rectangle" style="top:725px;left: 330px;"><span class="rectangle-text">步骤5</span></div></div><div><div class="arrow-horizontal-down" style="top:590px;left:345px;"><div></div><span></span></div><div class="rectangle" style="top:725px;left: 480px;"><span class="rectangle-text">步骤6</span></div></div><div><div class="arrow-horizontal-down" style="top:590px;left:485px;"><div></div><span></span></div><div class="rectangle" style="top:725px;left: 620px;"><span class="rectangle-text">步骤7</span></div></div><div class="arrow-down" style="top:775px;left:140px;"><span></span></div><div class="diamond" style="top:870px;left: 100px;"><span class="diamond-text">分叉节点</span></div><div class="arrow-down" style="top:965px;left:140px;"><span></span></div></div>
</body>
</html>
css
/* 椭圆 */
.ellipse {width: 100px;height: 50px;background-color: #6495ED;border-radius: 100px;text-align: center;position: absolute;}/* 菱形，长宽91.28 */.diamond {width: 80px;height: 80px;color: aliceblue;transform: rotate(45deg);background-color: rgb(249, 169, 100);position: absolute;}.diamond-text{width: 60px;margin-top: 10px;display: inline-block;transform: rotate(-45deg);text-align: center;}/* 长方形 */.rectangle{width: 92px;height: 50px;border: 1px;line-height: 50px;color: aliceblue;border-color: black;background-color: rgb(61, 64, 146);text-align: center;position: absolute;}/* 向下箭头 */.arrow-down {width: 2px;height: 80px;background-color: black;position: absolute;}.arrow-down span {width: 0;height: 0;border-left: 5px solid transparent;border-right: 5px solid transparent;border-top: 10px solid black;position: relative;top:81px;left:-4px;}/* 折线箭头 */.arrow-horizontal-down {width: 180px;height: 2px;background-color: black;position: absolute;z-index: -1;}/* 横线 */.horizontal-line{width: 100px;height: 2px;background-color: black;position: absolute;z-index: -1;}这个示例创建了一个简单的流程图，包括开始、执行步骤、检查条件、根据条件分支以及结束。流程图使用CSS进行样式设置，包括步骤框和箭头。