The portals repo was created with ancient browsers like IE6 in mind, and thus included CSS hacks to account for these ancient browser quirks. Since browsers lower than IE9 cannot access Wikimedia properties due to TLS 1.2 limitations, it makes sense to remove these hacks from the codebase.
- The file https://gerrit.wikimedia.org/r/plugins/gitiles/wikimedia/portals/+/refs/heads/master/dev/wikipedia.org/assets/postcss/_ie.css is removed
- The reference to that file is removed from https://gerrit.wikimedia.org/r/plugins/gitiles/wikimedia/portals/+/refs/heads/master/dev/wikipedia.org/assets/postcss/README.txt
- The import of that file is removed from https://gerrit.wikimedia.org/r/plugins/gitiles/wikimedia/portals/+/refs/heads/master/dev/wikipedia.org/assets/postcss/style.css