[css-grid] Feature: span to last track no matter whether auto-generated (implicit) tracks are involved or not

In a current project, I need a cell to span all columns, including all implicit columns.

This currently doesn't work:

grid-column: 1 / -1;

I would expect the above line to cause the cell to span all columns, no matter whether they're all explicit, all implicit, or mixed.

I hope this can be ensured in the spec and in browsers.

P.S.

Thanks for CSS Grid! Overall it's a joy to use.

Added later:

Also see this earlier ticket: #388

Provide feedback