Add appearance to details, closes #569

Except `accent` as that's a) far less useful and b) trickier due to the icon color

docs/docs/components/details.md

@@ -77,6 +77,31 @@ The details component automatically adapts to right-to-left languages:
 </wa-details>
 ```
 
+### Appearance
+
+Use the `appearance` attribute to change the element’s visual appearance.
+
+```html {.example}
+<div class="wa-stack">
+<wa-details summary="Outlined (default)">
+  Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna
+  aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
+</wa-details>
+<wa-details summary="Filled" appearance="filled">
+  Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna
+  aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
+</wa-details>
+<wa-details summary="Filled + Outlined" appearance="filled outlined">
+  Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna
+  aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
+</wa-details>
+<wa-details summary="Plain" appearance="plain">
+  Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna
+  aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
+</wa-details>
+</div>
+```
+
 ### Grouping Details
 
 Details are designed to function independently, but you can simulate a group or "accordion" where only one is shown at a time by listening for the `wa-show` event.

docs/docs/native/details.md

@@ -19,6 +19,35 @@ file: styles/native/details.css
 
 ## Examples
 
+### Appearance
+
+Use the [appearance utility classes](/docs/utilities/appearance) to change the element's visual appearance:
+
+```html {.example}
+<div class="wa-stack">
+<details>
+  <summary>Outlined (default)</summary>
+  Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna
+  aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
+</details>
+<details class="wa-filled">
+  <summary>Filled</summary>
+  Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna
+  aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
+</details>
+<details class="wa-filled wa-outlined">
+  <summary>Filled + Outlined</summary>
+  Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna
+  aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
+</details>
+<details class="wa-plain">
+  <summary>Plain</summary>
+  Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna
+  aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
+</details>
+</div>
+```
+
 ### Right-to-Left Languages
 
 The details styling automatically adapts to right-to-left languages:

src/components/details/details.ts

@@ -9,6 +9,7 @@ import { getTargetElement, waitForEvent } from '../../internal/event.js';
 import { watch } from '../../internal/watch.js';
 import WebAwesomeElement from '../../internal/webawesome-element.js';
 import nativeStyles from '../../styles/native/details.css';
+import appearanceStyles from '../../styles/utilities/appearance.css';
 import { LocalizeController } from '../../utilities/localize.js';
 import '../icon/icon.js';
 import styles from './details.css';
@@ -45,7 +46,7 @@ import styles from './details.css';
  */
 @customElement('wa-details')
 export default class WaDetails extends WebAwesomeElement {
-  static shadowStyle = [nativeStyles, styles];
+  static shadowStyle = [appearanceStyles, nativeStyles, styles];
 
   private detailsObserver: MutationObserver;
   private readonly localize = new LocalizeController(this);
@@ -67,6 +68,9 @@ export default class WaDetails extends WebAwesomeElement {
   /** Disables the details so it can't be toggled. */
   @property({ type: Boolean, reflect: true }) disabled = false;
 
+  /** The element's visual appearance. */
+  @property({ reflect: true }) appearance: 'filled' | 'outlined' | 'plain' = 'outlined';
+
   firstUpdated() {
     this.body.style.height = this.open ? 'auto' : '0';
     if (this.open) {

src/styles/native/details.css

@@ -2,10 +2,12 @@ details:where(:not(:host *)),
 :host {
   --icon-color: var(--wa-color-text-quiet);
   --spacing: var(--wa-space-m);
+  --outlined-border-color: var(--wa-color-surface-border);
 
-  background-color: var(--wa-color-surface-default);
-  border: var(--wa-panel-border-width) var(--wa-color-surface-border) var(--wa-panel-border-style);
+  background-color: var(--background-color, var(--wa-color-surface-default));
+  border: var(--wa-panel-border-width) var(--border-color, var(--wa-color-surface-border)) var(--wa-panel-border-style);
   border-radius: var(--wa-panel-border-radius);
+  color: var(--text-color, inherit);
   padding: var(--spacing);
 
   /* Print styles */