This parameter sets the maximum allowed length on <code>img</code> tags,
effectively the <code>width</code> and <code>height</code> properties.
Only absolute units of measurement (in, pt, pc, mm, cm) and pixels (px) are allowed. This is
in place to prevent imagecrash attacks, disable with null at your own risk.
This directive is similar to %HTML.MaxImgLength, and both should be
concurrently edited, although there are
subtle differences in the input format (the CSS max is a number with
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