Created attachment 271732 [details] [HTML] Reduction On retina screen, the following CSS doesn't produce any visible borders: table {border-collapse: collapse} td {border: 0.5px solid green} I would expect the border to be visible as it is visible for "border-width: 1px". Currently, I don't know an easy way to make a table with half-pixel borders.
*** This bug has been marked as a duplicate of bug 150383 ***