HTML
基础 HTML 元素为 HTML 中的相对 URI 提供基础。 JavaScript 和 CSS 也必须遵守其中发出的相对 URI：
例如
JavaScript:
location.href = "mypage.htm"`
CSS:（
h4 {
background-image: url(myimage.gif)
}
在任何浏览器中？）
The base HTML element provides a base for relative URIs in the HTML. Must JavaScript and CSS also honor it for relative URIs issued in them:
E.g.
JavaScript:
location.href = "mypage.htm"`
CSS:
h4 {
background-image: url(myimage.gif)
}
(in any browser?)
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CSS 路径始终相对于样式表本身，并且不依赖于 HTML 位置（除非 IE6 有问题且愚蠢并尝试加载 CSS
behavior中指定的.htc文件相对于文档的属性）。对于其他内容，location.href=...;等内容。顺便说一句，CSS paths are always relative to the stylesheet itself and have no dependence on the HTML location (except when IE6 is buggy and stupid and tries to load
.htcfiles specified in CSSbehaviorattributes relative to the document). For other stuff,<base>will affect the perceived current directory of the HTML as if the file was located in the directory defined by base. Consequently, it does affect things likelocation.href=...;. By the way, inline styles and style information in<style>element are loaded relative to the document location. Those are affected by the<base>tag, of course.base标签实际上仅受 HTML 文档本身内的相对链接的影响。然而，在 HTML（而不是 XHTML）中使用
，但 IE6 错误地假定它为 true，这将导致整个内容html>body）中完全无法访问元素，直到您发现实际上有一个base 之间。正常的 IE6 修复是使用条件注释来包含结束标记：
The
basetag is indeed only honoured by the relative links inside the HTML document itself.There's however an IE6-specific bug which you really need to take into account when using
<base>tag in HTML (not in XHTML). The<base>tag is in HTML documented as not having an end tag</base>, but IE6 incorrectly assumed it for true which will cause that the entire content after the<base>tag is placed as child of the<base>tag in its HTML DOM tree. This can cause at first sight unexplainable problems in Javascript/jQuery/CSS, i.e. the elements being completely unreachable in specific selections (e.g.html>body) until you discover that there's actually abasein between.A normal IE6 fix is using conditional comments to include the end tag: