This property determines whether HTML layout is checked and
adjusted for optimal output to PDF.
HTML layout is optimized for screen based output on a scrolling
display. Certain types of percentage based sizing can give rise to
situations in which the proportions of the different elements do
not add up to 100%. On screen this type of confused layout is less
noticable than it is on a paged medium like PDF.
When set the document is scanned for typical layout based errors
and these are fixed.
However if you are not using these features then skipping the
adjustment stage can save time with no noticable change in output