Html 默认的 `<body>` 边距有多宽？
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How wide is the default `<body>` margin?
提问by John
What's the default marginthat HTML sets for its <body>tag? I noticed that there's some automatic margin, but I'm wondering if anyone knows how much it is (and whether it's in pxor %, etc.).
marginHTML 为其<body>标签设置的默认值是什么？我注意到有一些自动保证金，但我想知道是否有人知道它是多少（以及它是否在px或%等）。
回答by Jon Egeland
In most major browsers, the default margin is 8pxon all sides. It is defined in pixels by the user-agent-stylesheetyour browser provides.
在大多数主要浏览器中，默认边距是8px所有边。它由user-agent-stylesheet您的浏览器提供的像素定义。
Some browsers allow you to create and use your own user-agent-stylesheet, but if you are developing a website, I would recommend staying away from changing this, since your users most likely will not have a modified stylesheet and would then see a different page than you do.
某些浏览器允许您创建和使用自己的user-agent-stylesheet，但是如果您正在开发一个网站，我建议您不要更改它，因为您的用户很可能不会修改样式表，然后会看到与您不同的页面。
If you want to change it, you can just do this:
如果你想改变它，你可以这样做：
body {
margin: 0px;
padding: 0px;
...
}
But if you have a large project and want to be more complete, use normalize.css. It resets a lot of default values to be consistent across browsers.
但是，如果您有一个大型项目并希望更完整，请使用normalize.css。它重置了许多默认值以在浏览器之间保持一致。
回答by Vickar
According to W3School's CSS reference,the default properties and values for a body tag are,
根据W3School 的 CSS 参考，body 标签的默认属性和值是，
body{ display : block; margin : 8px; }
And one can quickly get the computed details of any element by accessing the Computed Pane in the Chrome Dev tools.
通过访问Chrome Dev 工具中的Computed Pane，您可以快速获取任何元素的计算详细信息。
