"Autonomie" is a highly semantic, responsive, accessible and search engine optimized WordPress Theme. It provides HTML5 templates refined with microformats, microformats v2 and microdata (Schema.org). "Autonomie" supports a lot of OpenWeb plugins and is fully IndieWeb compatible.
As this fix is only necessary for IE11, it should no longer be necessary in 2024.
_s removed this file in 2020 (https://github.com/Automattic/_s/pull/1424)