HTML Reference : HTML Elements :
IMG

The IMG element embeds an image into the current document at the element's location. The element is usually replaced inline by the contents specified by the SRC attribute, except when the image is aligned left or right with the align attribute. When aligned left or right, the text wraps around the image.

Currently, the most commonly supported image formats are GIF and JPG. Internet Explorer 4.0 adds basic support for PNG which offers betters compression and alpha channel transparency (alpha channel not supported).

When using the IMG element, you should always specify the ALT attribute that describes or explains the images purpose. This makes your page more accessibility to non-visual browsers and browsers with images turned off. For similar reasons, the use of server side image maps is dissuaded.
Attribute Information

align - IE3, IE4, IE5, NS3, NS4   bottom (IE3, IE4, IE5, NS3, NS4) left (IE3, IE4, IE5, NS3, NS4) middle (IE3, IE4, IE5, NS3, NS4) right (IE3, IE4, IE5, NS3, NS4) clear top (IE3, IE4, IE5, NS3, NS4)

alt - IE3, IE4, IE5, NS3, NS4

class - IE3, IE4, IE5, NS4 (coreattrs)   CDATA

id - IE3, IE4, IE5, NS4 (coreattrs)   ID

language - IE4, IE5 (coreattrs)

style - IE3, IE4, IE5, NS4 (coreattrs)   CDATA

title - IE4, IE5 (coreattrs)   CDATA

onclick - IE3, IE4, IE5, NS3, NS4 (events)

ondblclick (events)

onkeydown (events)

onkeypress (events)

onkeyup (events)

onmousedown (events)

onmousemove (events)

onmouseout (events)

onmouseover (events)

onmouseup (events)

dir (i18n)   ltr rtl

lang (i18n)   CDATA

border - IE3, IE4, IE5, NS3, NS4

controls - IE3, IE4, IE5

datafld - IE4, IE5   CDATA

datasrc - IE4, IE5

dynsrc - IE3, IE4, IE5

height - IE3, IE4, IE5, NS3, NS4

hspace - IE3, IE4, IE5, NS3, NS4

ismap - IE3, IE4, IE5, NS3, NS4

longdesc

loop - IE3, IE4, IE5

lowsrc - IE4, IE5, NS3, NS4

src - IE3, IE4, IE5, NS3, NS4

start - IE3, IE4, IE5

suppress - NS4

usemap - IE3, IE4, IE5, NS3, NS4

vspace - IE3, IE4, IE5, NS3, NS4

width - IE3, IE4, IE5, NS3, NS4

DTD Information
The DTD defines the set of elements that can be properly contained within the element.

This element is an empty Element which means there is no end tag.

Any red entries in the DTD list are considered exclusions and are not valid within this tag.

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