<base>

HTML <base> Tag

Instance

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>php中文网(php.cn)</title>
<base href="//m.sbmmt.com//images/" target="_blank">
</head>
<body>

<p><img src="logo.png" > - 注意这里我们设置了图片的相对地址。能正常显示是因为我们在 head 部分设置了 base 标签，该标签指定了页面上所有链接的默认 URL，所以该图片的访问地址为 "//m.sbmmt.com/images/logo.png"</p>

<p><a href="//m.sbmmt.com/">php.cn</a> - 注意这个链接会在新窗口打开，即便它没有 target="_blank" 属性。因为在 base 标签里我们已经设置了 target 属性的值为 "_blank"。</p>

</body>
</html>

Run Example»

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Browser support

##All major browsers support the <base> tag .

Tag definition and usage instructions

<base> tag specifies the default URL or default target for all relative links on the page.

In a document, at most one <base> element can be used. The <base> tag must be inside a <head> element.

Tips and Notes

Tips: Please place the <base> tag in the <head> elementFirst The position of the element so that other elements in the head area can use the information in the <base> element.

Note: If the <base> tag is used, it must have the href attribute or the target attribute or both attributes.

Differences between HTML 4.01 and HTML5

None.

Differences between HTML and XHTML

In HTML, the <base> tag does not have a closing tag.

In XHTML, the <base> tag must be closed properly.

Properties

PropertiesValueDescriptionhrefSpecifies the base URL of all relative links in the page. target_blank specifies where all hyperlinks and forms in the page will be opened. This attribute is overridden by the target attribute in each link.


	URL
	_parent _self _top framename

##Global attributes

<base> tag supports global attributes of HTML.

Event attributes

<base>

HTML <base> Tag

Instance

Browser support

<base> tag supports global attributes of HTML.

<base> tag does not support any event attributes.

HTML DOM Reference Manual: Base Object

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