feat: drop support for IE11

BREAKING CHANGE: IE11 is no longer supported

Author: mattlewis92

.browserslistrc

@@ -1,11 +1,17 @@
-# This file is currently used by autoprefixer to adjust CSS to support the below specified browsers
+# This file is used by the build system to adjust CSS and JS output to support the specified browsers below.
 # For additional information regarding the format and rule options, please see:
 # https://github.com/browserslist/browserslist#queries
-#
-# For IE 9-11 support, please remove 'not' from the last line of the file and adjust as needed
 
-> 0.5%
-last 2 versions
+# For the full list of supported browsers by the Angular framework, please see:
+# https://angular.io/guide/browser-support
+
+# You can see what browsers were selected by your queries by running:
+#   npx browserslist
+
+last 1 Chrome version
+last 1 Firefox version
+last 2 Edge major versions
+last 2 Safari major versions
+last 2 iOS major versions
 Firefox ESR
-not dead
-not IE 9-10
+not IE 11 # Angular supports IE 11 only as an opt-in. To opt-in, remove the 'not' prefix on this line.

package-lock.json

@@ -136,7 +136,6 @@
     "npm-run-all": "^4.1.5",
     "postcss": "^8.4.14",
     "postcss-cli": "^10.0.0",
-    "postcss-flexibility": "^3.0.0",
     "prettier": "^2.7.1",
     "pretty-quick": "^3.1.3",
     "process": "^0.11.10",

package.json

@@ -1,5 +1,4 @@
 const autoprefixer = require('autoprefixer');
-const postCssFlexibility = require('postcss-flexibility').default;
 
 module.exports = () => ({
   plugins: [
@@ -11,6 +10,5 @@ module.exports = () => ({
         'last 20 Firefox versions',
       ],
     }),
-    postCssFlexibility,
   ],
 });

postcss.config.js

@@ -113,11 +113,6 @@ $cal-month-view-vars: map.merge($cal-vars, $cal-month-view-vars);
 
   .cal-day-cell {
     min-height: 100px;
-
-    // ie11 hack for https://github.com/mattlewis92/angular-calendar/issues/501
-    @media all and (-ms-high-contrast: none) {
-      display: block;
-    }
   }
 
   .cal-day-cell:not(:last-child) {