Visibility

It is widely heralded that 'visibility: hidden' leaves a blank for
the missing element in layout; whereas 'display:none' does not.
This may be true for text elements, but in the case of image , not so
much.
Reference:

 display: none

 visibility: hidden

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Matching arrays is coming along:

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'Display' works fine:

                          
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Maddeningly, if I change the display setting on a group of images in random order,
they will still show up in the original order. All said and done, going to have to use
the appendchild() method. Should be able to put this together...

                    
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