This was part of the HTML3.0 specification that is no longer active. It was proposed in conjunction with the <fig> tag to reduce bandwidth use.
This is used to overlay images on top of a base figure. Figure overlays provide for more effective use of caching as small changes to a figure in a subsequent document incur only the penalty of downloading the overlays and not the large base figure, as the latter is already in the cache. The overlay can be offset from the top left corner of the base image.
height=
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this specifies the desired height in pixels or en units (according to the value of the UNITS attribute). Browsers may scale the figure image to match this height. (Dianne Gorman)
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| "## en"
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"move down until there is at least 40 en units free" (w3)
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| "### pixels"
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"move down until there is at least 100 pixels free" (w3)
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imagemap=
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specifies the URI for processing image clicks and drags.
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md=
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This attribute specifies the message digest or chyptographic checksum (MD5 in base 64). The MD attribute is generally allowed for all elements which support URI based links.
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src=
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specifies the overlay image as a URI. This attribute may appear together with the MD attribute. (Dianne Gorman)
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units=
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specifies the choice of units for width and height: units="pixels" (the default) specifies pixels, while units="en" specifies en units (a typographic unit equal to half the point size). (Dianne Gorman) [it must be noted that an "en" in pure typesetting terms is the equivalent to the width of the capital "N". Every font is slightly different and as a result, the "en" space (or "nutt" as it is called) becomes relative to the size of the font selected in the browser. This has been considered a stable relative measurement in the typesetting industry for centuries.
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| "## en"
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"move down until there is at least 40 en units free" (w3)
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"move down until there is at least 100 pixels free" (w3)
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width=
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Specifies the desired width in pixels or en units. Browsers may scale the figure image to match this width. (Dianne Gorman)
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| "## en"
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"move down until there is at least 40 en units free" (w3)
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"move down until there is at least 100 pixels free" (w3)
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X=
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The X offset from the top left corner of the base image. "X" increases to the right, and is given in pixels or en units (according to the value of the UNITS attribute." (Dianne Gorman)
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| "## en"
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"move down until there is at least 40 en units free" (w3)
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"move down until there is at least 100 pixels free" (w3)
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Y=
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The Y offset from the top left corner of the base image. "Y" increases downwards, and is gtiven in pixels or en units (according to the value of the UNITS attribute". (Dianne Gorman)
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| "## en"
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"move down until there is at least 40 en units free" (w3)
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| "### pixels"
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"move down until there is at least 100 pixels free" (w3)
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