Uses flexbox to avoid the need for nested elements, or using overflow hidden to mask super-long absolutely-positioned lines.

This technique works in all decent browsers, including IE11+. IE10 requires some legacy flexbox syntax and some extra tweaks but also displays as expected.

IE9 and earlier show partial lines (at the pseudo-element’s min-width), but still looks passable. If content wraps to multiple lines, the after element drops too. Depending on design, I'd use a .flexbox Modernizr class to either hide the lines or would revert to an older method where absolute positioning, super-wide fixed-width lines, and overflow hidden are used.