Apparantly IE11 doesn't have a User Agent Style for <main>
and therefor no display: block;
on it. Why is there no User Agent Style? Is this a bug or on purpose?
Adding display: block;
to the main element is enough, tho.
The main
element is indeed not fully supported by IE11. Adding main { display: block; }
to your CSS is the best solution for IE9+. You don't need to make conditional comments - since display: block;
is the default behavior for main
elements, it won't mess up anything.