css让文字水平排列的方法：首先创建一个HTML示例文件；然后在body中创建h1标签内容；最后通过“text-align”属性设置文字水平排列即可。
本文操作环境：Windows7系统、HTML5&&CSS3版，DELL G3电脑
css中可以使用text-align：center样式设置文字水平居中。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style>
h1 {text-align:center}
h2 {text-align:left}
h3 {text-align:right}
</style>
</head>
<body>
<h1 id="This-nbsp-is-nbsp-heading-nbsp">This is heading 1</h1>
<h2 id="This-nbsp-is-nbsp-heading-nbsp">This is heading 2</h2>
<h3 id="This-nbsp-is-nbsp-heading-nbsp">This is heading 3</h3>
</body>
</html>效果如下：
text-align 属性规定元素中的文本的水平对齐方式。
该属性通过指定行框与哪个点对齐，从而设置块级元素内文本的水平对齐方式。通过允许用户代理调整行内容中字母和字之间的间隔，可以支持值 justify；不同用户代理可能会得到不同的结果。
属性值：
left 把文本排列到左边。默认值：由浏览器决定。
right 把文本排列到右边。
center 把文本排列到中间。
justify 实现两端对齐文本效果。
inherit 规定应该从父元素继承 text-align 属性的值。
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