gridautorows and gridautocolumns are not supported, because IE11 can only create columns and rows automatically based on the size of the content it contains in the grid So if you try to explicitly give a size with auto rows or columns, it will default to autoA floatingpoint number, followed by either an absolute units designator ( cm, mm, in, pt, or pc) or a relative units designator ( em, ex, or px ), that indicates the width of the gap between columns For more information about the supported length units, see CSS Length Units Reference Negative values are not validW3Schools Grid column gap;
Css Grid Layout Support For Ie11 Stack Overflow
