Third-level titles

If available, insert the title from the second-level page into the title
here.
Mobile-friendly unicode icons

Replaces the home and child icons with new unicode symbols that are
supported on Android browsers.
Unnest viewport size media selector block

Doing this nesting causes problems for Internet Explorer 9, and maybe
others.
Enforce IE=edge rendering mode

Adds this as both a header and a meta tag.