docs(select): add new section on rich content options

.github/workflows/CI.yml

@@ -25,6 +25,8 @@ jobs:
       run: npm ci --legacy-peer-deps
     - name: Lint
       run: npm run lint
+    - name: Test
+      run: npm run test
     - name: Spell Check
       run: npm run spellcheck
     # Lint and spell check changes should be pushed

docs/api/select.md

@@ -201,6 +201,22 @@ import StartEndSlots from '@site/static/usage/v9/select/start-end-slots/index.md
 
 <StartEndSlots />
 
+## Rich Content Options
+
+:::important
+Rich content in select options is disabled by default. Set [`innerHTMLTemplatesEnabled`](/docs/developing/config.md#ionicconfig) to `true` in your [global Ionic config](/docs/developing/config.md#global-config). Markup inside options is treated as plain text when it is disabled. Refer to [Security](/docs/techniques/security.md) for sanitization guidance when enabling custom HTML.
+:::
+
+In addition to single text labels, [Select Options](./select-option.md) can include HTML rich content in the select interface. Elements added inside of an option without a named slot will go into the default slot. The `start` and `end` slots will place elements on either side of the default slot. The `description` attribute can be used for additional supporting text displayed under the label.
+
+This is separate from [Start and End Slots](#start-and-end-slots) on `ion-select`, which decorate the closed field. The rich content options display in the interface after opening the select.
+
+When an option is selected, the closed field shows the option's text content as plain text only. HTML markup is stripped, and the `start` and `end` slots and the `description` attribute are not included in the selected display.
+
+import RichContentOptions from '@site/static/usage/v9/select/rich-content-options/index.md';
+
+<RichContentOptions />
+
 ## Customization
 
 There are two units that make up the Select component and each need to be styled separately. The `ion-select` element is represented on the view by the selected value(s), or placeholder if there is none, and dropdown icon. The interface, which is defined in the [Interfaces](#interfaces) section above, is the dialog that opens when clicking on the `ion-select`. The interface contains all of the options defined by adding `ion-select-option` elements. The following sections will go over the differences between styling these.

docs/developing/config.md

@@ -180,7 +180,7 @@ Below are the config options that Ionic uses.
 | `backButtonDefaultHref`     | `string`                                                                          | Overrides the default value for the `defaultHref` property in all `<ion-back-button>` components.                                                                                                                                                                                      |
 | `backButtonIcon`            | `string`                                                                          | Overrides the default icon in all `<ion-back-button>` components.                                                                                                                                                                                                                      |
 | `backButtonText`            | `string`                                                                          | Overrides the default text in all `<ion-back-button>` components.                                                                                                                                                                                                                      |
-| `innerHTMLTemplatesEnabled` | `boolean`                                                                         | Relevant Components: `ion-alert`, `ion-infinite-scroll-content`, `ion-loading`, `ion-refresher-content`, `ion-toast`. If `true`, content passed to the relevant components will be parsed as HTML instead of plaintext. Defaults to `false`.                                           |
+| `innerHTMLTemplatesEnabled` | `boolean`                                                                         | Relevant Components: `ion-alert`, `ion-infinite-scroll-content`, `ion-loading`, `ion-refresher-content`, `ion-select-option`, `ion-toast`. If `true`, content passed to the relevant components will be parsed as HTML instead of plaintext. Defaults to `false`.                      |
 | `hardwareBackButton`        | `boolean`                                                                         | If `true`, Ionic will respond to the hardware back button in an Android device.                                                                                                                                                                                                        |
 | `infiniteLoadingSpinner`    | `SpinnerTypes`                                                                    | Overrides the default spinner type in all `<ion-infinite-scroll-content>` components.                                                                                                                                                                                                  |
 | `loadingEnter`              | `AnimationBuilder`                                                                | Provides a custom enter animation for all `ion-loading`, overriding the default "animation".                                                                                                                                                                                           |

docs/techniques/security.md

@@ -61,7 +61,7 @@ To learn more about the security recommendations for binding to directives such
 
 ## Enabling Custom HTML Parsing via `innerHTML`
 
-`ion-alert`, `ion-infinite-scroll-content`, `ion-loading`, `ion-refresher-content`, and `ion-toast` can accept custom HTML as strings for certain properties. These strings are added to the DOM using `innerHTML` and must be properly sanitized by the developer. This behavior is disabled by default which means values passed to the affected components will always be interpreted as plaintext. Developers can enable this custom HTML behavior by setting `innerHTMLTemplatesEnabled: true` in the [IonicConfig](../developing/config#ionicconfig).
+`ion-alert`, `ion-infinite-scroll-content`, `ion-loading`, `ion-refresher-content`, `ion-select-option`, and `ion-toast` can accept custom HTML as strings for certain properties. These strings are added to the DOM using `innerHTML` and must be properly sanitized by the developer. This behavior is disabled by default which means values passed to the affected components will always be interpreted as plaintext. Developers can enable this custom HTML behavior by setting `innerHTMLTemplatesEnabled: true` in the [IonicConfig](../developing/config.md#ionicconfig).
 
 ## Ejecting from the built-in sanitizer