(mPDF >= 4.0)
Specify the behaviour defining the bottom-margin of the document. When $$setAutoBottomMargin is set to ‘stretch’ then $autoMarginPadding defines the minimum distance in mm that will be forced between the top of the footer and the bottom of the main text.
pad - the value for margin-bottom is used to set a fixed distance in mm (padding) between the top of the footer and the bottom of the main text
stretch - margin-bottom sets a minimum distance in mm between the bottom of the page and the bottom of the main text, which expands if the footer is too large to fit.
FALSE - the defined value for margin-bottom is respected even if the footer overlaps the main body of the document.