Base Tags in HTML5

A Base tag is usually used to set a default (base) URL or relative links for all subsequent relative links.

A Base tag provides a default (base) URL or relative links. It is usually used to set a default URL for all subsequent relative links. Relative links can be a stylesheet, source of script tag and hrefs in anchor tag. In simple terms you can say a base tag sets a default address or a default target for all links on a page.

One important thing that you should always remember is that a base tag must be within the head tag and it must be the first tag in the head tag. You can use only one base tag in a document and you must use the href attribute, target attribute or both.

Standard Syntax

target="frame or window name | _blank | _parent | _self |_top">


<!-- standard HTML syntax --->
<base href="http://">
<!-- with frames -->
<base target="_blank" href="http://">

Attributes Introduced by HTML5
Values Desciption
accesskey spaced list of accelerator key(s)
contenteditable true | false | inherit
contextmenu id of menu
data-X user-defined data
draggable true | false | auto
hidden hidden
itemid microdata id in URL format
itemprop microdata value
itemref space-separated list of IDs that may contain microdata
itemscope itemscope
itemtype microdata type in URL format
spellcheck true | false"
tabindex number


HTML5 Event Attributes
onabort onblur oncanplay oncanplaythrough onchange
onclick oncontextmenu ondblclick ondrag ondragend
ondragenter ondragleave ondragover ondragstart ondrop
ondurationchange onemptied onended onerror onfocus
onformchange onforminput oninput oninvalid onkeydown
onkeypress onkeypress onkeyup onload onloadeddata
onloadedmetadata onloadstart onmousedown onmousemove onmouseout
onmouseover onmouseup onmousewheel onpause onplay
onplaying onprogress onratechange onreadystatechange onscroll
onseeked onseeking onselect onshow onstalled
onsubmit onsuspend ontimeupdate onvolumechange onwaiting

Attributes Defined by Internet Explorer
id="unique alphanumeric identifier" (4)

Events Defined by Internet Explorer



<!DOCTYPE html>
base href=""/>

header><P>Hi.. Freinds.</header>
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Internet Explorer

Base Tag


Base Tag


Base Tag


Base Tag