columns

[mpa3b]

'columns' CSS3-property is not being processed, not mentioned in script code.

[daviestar]

I didn't find an issue with columns (possibly natively supported in the browsers I'm testing), but I did find an issue with break-inside:

-webkit-column-break-inside: avoid; /* Chrome, Safari, Opera */
page-break-inside: avoid; /* Firefox */
break-inside: avoid; /* IE 10+ */

First issue I've had with this script and I've been using it for years!