修改 Google Chrome 或 Mozilla Firefox 显示设置
我想知道是否可以修改 Chrome 或 Firefox 显示设置，使其仅显示 HTML DOM 对象的矩形？我想做的是尽可能减少渲染引擎的工作量，因此它只会构建页面的布局。
I would like to know if it is possible to modify Chrome or Firefox display settings, so that it would only show rectangles of HTML DOM objects? What I want to do is to decrease rendering engine job amount as much as possible, so it would only build layout of the page.
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人们通常将这种操作模式称为“无头”（即没有 UI）。
通常还有一个额外的要求 - 能够在服务器端运行它，而无需安装通常的客户端软件。如果您在客户端运行它，我不会担心优化，无论如何它都不会给您带来巨大的胜利。
否则，请尝试使用该术语进行搜索。我已经多次看到它提出要求，但还没有看到可用的现成解决方案。
[编辑]刚刚看到http://hg.mozilla.org/incubator/offscreen，其中似乎是 Mozilla 的无头版本。
People usually refer to this mode of operation as "headless" (i.e. without UI).
Usually there's an additional requirement - to be able to run it server-side without the usual for client software installed. If you're running it client-side, I wouldn't bother about optimization, it shouldn't give you a big win anyway.
Otherwise, try searching using that term. I've seen it asked for several times, but haven't seen a working out-of-box solution.
[edit] just saw http://hg.mozilla.org/incubator/offscreen, which seems to be a headless version of Mozilla.
我不会像修改渲染器那样低级。相反，我建议您使用 Firefox 的 Greasemonkey 来替换页面包含您需要的任何内容。您需要了解一些 JavaScript，但这并不难。
但是，这仅适用于客户端。如果您想在服务器端执行此操作（以便它可以在用户通过您自己请求的任何页面上工作），我的猜测是您需要以字符串形式获取页面的内容，然后使用 HTML 对其进行修改解析器。
I wouldn't go as low-level as modifying the renderer. Instead, I suggest you use Firefox's Greasemonkey to replace the elements from the page with whatever it is you need. You'll need to know a bit of JavaScript, but it's not that hard.
However, this will only work on client side. If you want to do this on server-side ( so that it will work on any page a user requests through your own ), my guess is you'll need to grab the page's content in a string, and then modify it using a HTML parser.