feat(css): add new display css classes and test

Author: brandyscarney

core/src/css/display.scss

@@ -2,9 +2,14 @@
 @import "../themes/ionic.mixins";
 
 // Display
-// --------------------------------------------------
-// Modifies display of a particular element based on the given classes
+// ------------------------------------------------------------------
+// Provides utility classes to control the CSS display property
+// of elements. Includes responsive variants for toggling between
+// block, inline, flex, grid, and other display values at different
+// breakpoints.
 
+// TODO(FW-6697): remove ion-hide-* classes in favor of the new
+// ion-display-* classes
 .ion-hide {
   display: none !important;
 }
@@ -29,3 +34,29 @@
     }
   }
 }
+
+$display-values: (
+  none,
+  inline,
+  inline-block,
+  block,
+  flex,
+  inline-flex,
+  grid,
+  inline-grid,
+  table,
+  table-cell,
+  table-row
+);
+
+@each $display in $display-values {
+  @each $breakpoint in map-keys($screen-breakpoints) {
+    $infix: breakpoint-infix($breakpoint, $screen-breakpoints);
+
+    @include media-breakpoint-up($breakpoint, $screen-breakpoints) {
+      .ion-display#{$infix}-#{$display} {
+        display: #{$display} !important;
+      }
+    }
+  }
+}

core/src/css/test/display.e2e.ts

@@ -0,0 +1,48 @@
+import { test, expect } from '@playwright/test';
+import fs from 'fs';
+import path from 'path';
+
+test.describe('display css utility classes', () => {
+  let css: string;
+
+  test.beforeAll(() => {
+    css = fs.readFileSync(path.resolve(__dirname, '../../../css/display.css'), 'utf8');
+  });
+
+  const INFIXES = ['', '-sm', '-md', '-lg', '-xl'];
+
+  // TODO(FW-6697): remove `ion-hide classes` test
+  test('ion-hide classes', () => {
+    expect(css).toContain('.ion-hide');
+
+    const values = ['up', 'down'];
+
+    for (const value of values) {
+      for (const infix of INFIXES) {
+        expect(css).toContain(`.ion-hide${infix}-${value}`);
+      }
+    }
+  });
+
+  test('ion-display classes', () => {
+    const values = [
+      'none',
+      'inline',
+      'inline-block',
+      'block',
+      'flex',
+      'inline-flex',
+      'grid',
+      'inline-grid',
+      'table',
+      'table-cell',
+      'table-row',
+    ];
+
+    for (const value of values) {
+      for (const infix of INFIXES) {
+        expect(css).toContain(`.ion-display${infix}-${value}`);
+      }
+    }
+  });
+});