The 1st image is referenced absolutely with /Blog/resources/1IMG.JPG, and produces for makePDF an error but the same ref is shown in HTML (understood as absolute reference relative to web root )

test 2nd imgage : Blog/resources/2IMG.JPG is incorrect relative reference and therefore not shown in HTML, but shown in PDF - interpreted relative to cwd .

test 3rd image : resources/3IMG.JPG is relative reference to position of .md file. shown in HTML but not in PDF .