img
Indicates that an image is to be included in the text flow. Image layout is done within the context of normal text layout. The image must be formatted as either a .jpg, .gif, or .png.
You can specify image sizes as percentages of the active area of the page, as pixel counts.
Width and height attributes expressed as percentages are treated as percentages with respect to the block element immediately containing them, which is often the page area. Pixel-based sizes are generally discouraged because the resulting layout does not scale well as the content is moved to different sized displays, or is rendered together with different user-chosen font-sizes.

attributes

src
This attribute specifies the URI of the image to be shown.
localsrc
Specifies an alternative internal representation for the image. If this image exists, the parameter takes precedence over any image specified in the src parameter.
border
Creates a border for an image. Set this attribute to 0, which is the default value, to make borders invisible
alt
An alternative textual representation for the image if it can not be displayed using any other method. This attribute is ignored.
longdesc
An alternative textual representation for the image if it can not be displayed using any other method. This attribute is ignored.
lowsrc
An alternative image representation for the image if big image can not be displayed. This attribute is ignored.
usemap
This attribute is ignored.
align
Specifies image alignment with respect to the baseline of the text. It has five possible values: right, left, bottom, middle or top.
width
Specifies the width of the image. If specified as a percentage value, the resulting size is based on the available horizontal space, not on the natural size of the image.
height
Specifies the height of the image. If specified as a percentage value, the resulting size is based on the available vertical space, not on the natural size of the image.
hspace
Specifies the amount of white space to be inserted to the left and right of the image. If specified as a percentage value, the resulting space is based on the available horizontal space, not on the natural size of the image.
vspace
Specifies the amount of white space to be inserted above and below the image. If specified as a percentage value, the resulting space is based on the available vertical space, not on the natural size of the image.
id
Provides an element with a unique name within a single deck.
class
Affiliates an element with one or more classes.
xml:lang
Specifies the natural or formal language in which the document is written.