[site] Replace theme menu with synced toggle

packages/lit-dev-content/.eleventy.js

@@ -527,24 +527,36 @@ ${content}
     return `<style>${result.styles}</style>`;
   });
 
-  /**
-   * Inline the Rollup-bundled version of a JavaScript module. Path is relative
-   * to ./rollupout.
-   *
-   * In dev mode, instead directly import the module, which has already been
-   * symlinked directly to the TypeScript output directory.
-   */
-  eleventyConfig.addShortcode('inlinejs', (path) => {
+  const inlineJs = (path, type) => {
+    const typeAttribute = type ? ` type="${type}"` : '';
     if (DEV) {
-      return `<script type="module" src="/js/${path}"></script>`;
+      return `<script${typeAttribute} src="/js/${path}"></script>`;
     }
     // Note we must trim before hashing, because our html-minifier will trim
     // inline script trailing newlines, and otherwise our hash will be wrong.
     const script = fsSync.readFileSync(`rollupout/${path}`, 'utf8').trim();
     const hash =
       'sha256-' + crypto.createHash('sha256').update(script).digest('base64');
     cspInlineScriptHashes.add(hash);
-    return `<script type="module">${script}</script>`;
+    return `<script${typeAttribute}>${script}</script>`;
+  };
+
+  /**
+   * Inline the Rollup-bundled version of a JavaScript module. Path is relative
+   * to ./rollupout.
+   *
+   * In dev mode, instead directly import the module, which has already been
+   * symlinked directly to the TypeScript output directory.
+   */
+  eleventyConfig.addShortcode('inlinejs', (path) => {
+    return inlineJs(path, 'module');
+  });
+
+  /**
+   * Inline a parser-blocking classic script.
+   */
+  eleventyConfig.addShortcode('inlineclassicjs', (path) => {
+    return inlineJs(path);
   });
 
   eleventyConfig.addNunjucksAsyncShortcode('algoliaid', async () => {

packages/lit-dev-content/rollup.config.js

@@ -35,6 +35,7 @@ export default [
       // lit-hydrate-support MUST be loaded first to make sure lit hydration
       // helpers are bundled before LitElement attempts to use hydration support
       'lib/global/lit-hydrate-support.js',
+      'lib/global/theme-worker.js',
       'lib/components/copy-button.js',
       'lib/components/litdev-banner.js',
       'lib/components/litdev-drawer.js',
@@ -151,7 +152,8 @@ export default [
   // the asynchronously-loaded module bundles above.
   {
     input: [
-      'lib/global/apply-saved-theme.js',
+      'lib/global/apply-session-theme.js',
+      'lib/global/initialize-theme.js',
       'lib/global/apply-mods.js',
       'lib/global/initialize-typescript-mode.js',
       'lib/global/mobile-drawer.js',

packages/lit-dev-content/site/_includes/default.html

@@ -15,7 +15,7 @@
     <link rel="modulepreload" href="{{ site.baseurl }}/js/global/hydrate-common-components.js">
 
     <meta name="theme-color" content="#fff">
-    {% inlinejs "global/apply-saved-theme.js" %}
+    {% inlinejs "global/initialize-theme.js" %}
     {% inlinecss "colors.css" %}
     {% inlinecss "global.css" %}
 
@@ -75,6 +75,7 @@
     </mwc-drawer>
 
     {% include 'header.html' %}
+    {% inlineclassicjs "global/apply-session-theme.js" %}
 
     {% if selectedVersion !== latestVersion %}
       <litdev-banner>

packages/lit-dev-content/site/_includes/header.html

@@ -17,9 +17,12 @@
 
     <litdev-ripple-icon-button
       id="mobileMenuButton"
-      label="Open menu"
+      label="Navigation menu"
+      button-title="Open navigation menu"
+      expanded="false"
+      controls="mobileDrawer"
     >
-      <svg height="24" width="24" fill="currentcolor">
+      <svg height="24" width="24" fill="currentcolor" aria-hidden="true">
         <path d="M3 18h18v-2H3v2zm0-5h18v-2H3v2zm0-7v2h18V6H3z" />
       </svg>
     </litdev-ripple-icon-button>

packages/lit-dev-content/site/playground/index.html

@@ -55,21 +55,22 @@ <h2 class="exampleSectionHeading">{{ section.name }}</h2>
     </litdev-playground-share-button>
 
     <litdev-ripple-icon-button
-        button-title="Toggle view mode"
+        label="Show preview only"
+        button-title="Show preview only"
         id="view-mode-button">
       <lazy-svg
         class="preview"
-        label="Show Only Preview"
+        svg-aria-hidden
         href="{{ site.baseurl }}/images/icons/preview.svg#icon"
         loading="eager"></lazy-svg>
       <lazy-svg
         class="code"
-        label="Show Only Code"
+        svg-aria-hidden
         href="{{ site.baseurl }}/images/icons/code.svg#icon"
         loading="eager"></lazy-svg>
       <lazy-svg
           class="splitscreen"
-          label="Show Split View"
+          svg-aria-hidden
           href="{{ site.baseurl }}/images/icons/splitscreen.svg#icon"
           loading="eager"></lazy-svg>
     </litdev-ripple-icon-button>

packages/lit-dev-content/src/components/litdev-drawer.ts

@@ -22,6 +22,7 @@ const closeIcon = html` <svg
   height="24"
   viewBox="0 0 24 24"
   fill="currentcolor"
+  aria-hidden="true"
 >
   <path
     d="M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z"
@@ -34,6 +35,7 @@ const bookIcon = html` <svg
   height="24"
   viewBox="0 0 24 24"
   fill="currentcolor"
+  aria-hidden="true"
 >
   <path
     d="M21,5c-1.11-0.35-2.33-0.5-3.5-0.5c-1.95,0-4.05,0.4-5.5,1.5c-1.45-1.1-3.55-1.5-5.5-1.5S2.45,4.9,1,6v14.65 c0,0.25,0.25,0.5,0.5,0.5c0.1,0,0.15-0.05,0.25-0.05C3.1,20.45,5.05,20,6.5,20c1.95,0,4.05,0.4,5.5,1.5c1.35-0.85,3.8-1.5,5.5-1.5 c1.65,0,3.35,0.3,4.75,1.05c0.1,0.05,0.15,0.05,0.25,0.05c0.25,0,0.5-0.25,0.5-0.5V6C22.4,5.55,21.75,5.25,21,5z M21,18.5 c-1.1-0.35-2.3-0.5-3.5-0.5c-1.7,0-4.15,0.65-5.5,1.5V8c1.35-0.85,3.8-1.5,5.5-1.5c1.2,0,2.4,0.15,3.5,0.5V18.5z"
@@ -152,7 +154,9 @@ export class LitDevDrawer extends LitElement {
 
         <litdev-ripple-icon-button
           id="openCloseButton"
-          aria-label="Open or close examples drawer"
+          label="Examples drawer"
+          .expanded=${this.open ? 'true' : 'false'}
+          controls="content"
           @click=${this._onClickToggleButton}
         >
           ${this.open ? closeIcon : bookIcon}

packages/lit-dev-content/src/components/litdev-playground-page.ts

@@ -32,6 +32,7 @@ import type {LitDevPlaygroundShareButton} from './litdev-playground-share-button
 import type {LitDevPlaygroundDownloadButton} from './litdev-playground-download-button.js';
 import type {LitDevDrawer} from './litdev-drawer.js';
 import type {LitDevExampleControls} from './litdev-example-controls.js';
+import type {LitDevRippleIconButton} from './litdev-ripple-icon-button.js';
 import type {PlaygroundProject} from 'playground-elements/playground-project.js';
 import type {PlaygroundPreview} from 'playground-elements/playground-preview.js';
 import type {PlaygroundFileEditor} from 'playground-elements/playground-file-editor.js';
@@ -115,7 +116,9 @@ export class LitDevPlaygroundPage extends LitElement {
   firstUpdated(changed: PropertyValues<this>) {
     super.firstUpdated(changed);
     // toggle previewFullscreen when the fullscreen button is clicked
-    const iconButton = this.querySelector('#view-mode-button');
+    const iconButton = this.querySelector(
+      '#view-mode-button'
+    ) as LitDevRippleIconButton | null;
     iconButton?.addEventListener('click', () => {
       const lastMode = this.viewMode;
       if (lastMode === 'split') {
@@ -126,6 +129,7 @@ export class LitDevPlaygroundPage extends LitElement {
         this.viewMode = 'split';
       }
     });
+    this._syncViewModeButton();
   }
 
   update(changed: PropertyValues<this>) {
@@ -161,6 +165,31 @@ export class LitDevPlaygroundPage extends LitElement {
     super.update(changed);
   }
 
+  updated(changed: PropertyValues<this>) {
+    if (changed.has('viewMode')) {
+      this._syncViewModeButton();
+    }
+    super.updated(changed);
+  }
+
+  private _syncViewModeButton() {
+    const button = this.querySelector(
+      '#view-mode-button'
+    ) as LitDevRippleIconButton | null;
+    if (!button) {
+      return;
+    }
+
+    const label =
+      this.viewMode === 'split'
+        ? 'Show preview only'
+        : this.viewMode === 'preview'
+        ? 'Show code only'
+        : 'Show split view';
+    button.label = label;
+    button.buttonTitle = label;
+  }
+
   /**
    * When the code editor is changed, store that there are unsaved changes.
    */

packages/lit-dev-content/src/components/litdev-ripple-icon-button.ts

@@ -11,47 +11,35 @@ import {customElement, property} from 'lit/decorators.js';
 @customElement('litdev-ripple-icon-button')
 export class LitDevRippleIconButton extends LitElement {
   /**
-   * Aria label for the button.
+   * Accessible label for the button.
    */
   @property()
   label = '';
 
   /**
-   * Sets aria-live for the button.
-   */
-  @property({type: String})
-  live = '';
-
-  /**
-   * Aria label for the button.
+   * Tooltip text for the button.
    */
   @property({attribute: 'button-title'})
   buttonTitle = '';
 
   /**
-   * Aria haspopup for the button.
+   * ARIA pressed state for toggle buttons.
    */
-  @property()
-  haspopup = '';
+  @property({attribute: false})
+  pressed?: boolean;
 
   /**
-   * Aria expanded for the button.
+   * ARIA expanded state for disclosure buttons.
    */
   @property()
-  expanded = '';
+  expanded: '' | 'true' | 'false' = '';
 
   /**
-   * Aria controls for the button.
+   * ID of the element controlled by a disclosure button.
    */
   @property()
   controls = '';
 
-  /**
-   * Sets the role for the inner button.
-   */
-  @property({attribute: 'button-role'})
-  buttonRole = '';
-
   /**
    * Href for the link button. If defined, this component switches to using an
    * anchor element instead of a button.
@@ -105,7 +93,13 @@ export class LitDevRippleIconButton extends LitElement {
       -webkit-tap-highlight-color: transparent;
     }
 
-    .root:disabled {
+    .root:focus-visible {
+      outline: 2px solid currentColor;
+      outline-offset: 2px;
+    }
+
+    .root:disabled,
+    .root[aria-disabled='true'] {
       cursor: default;
       pointer-events: none;
       opacity: 0.38;
@@ -160,17 +154,33 @@ export class LitDevRippleIconButton extends LitElement {
     return this.href ? this.renderAnchorRoot() : this.renderButtonRoot();
   }
 
+  protected override firstUpdated() {
+    // Lit hydration adopts server attributes without patching client-only
+    // state, so reconcile ARIA state once after the initial hydration pass.
+    const button = this.renderRoot.querySelector('button');
+    if (this.pressed !== undefined) {
+      button?.setAttribute('aria-pressed', String(this.pressed));
+    }
+    if (this.expanded) {
+      button?.setAttribute('aria-expanded', this.expanded);
+    }
+    if (this.controls) {
+      button?.setAttribute('aria-controls', this.controls);
+    }
+  }
+
   protected renderButtonRoot() {
     return html`
       <button
+        type="button"
         class="root"
         part="root button"
-        role=${this.buttonRole ? this.buttonRole : nothing}
-        aria-live=${this.live ? this.live : nothing}
         aria-label=${this.label ? this.label : nothing}
-        aria-haspopup=${this.haspopup ? this.haspopup : nothing}
-        aria-expanded=${this.expanded ? this.expanded : nothing}
-        aria-controls=${this.controls ? this.controls : nothing}
+        aria-pressed=${this.pressed === undefined
+          ? nothing
+          : String(this.pressed)}
+        aria-expanded=${this.expanded || nothing}
+        aria-controls=${this.controls || nothing}
         ?disabled=${this.disabled}
         title=${this.buttonTitle ?? (nothing as unknown as string)}
       >
@@ -184,9 +194,13 @@ export class LitDevRippleIconButton extends LitElement {
       <a
         class="root"
         part="root anchor"
-        href=${this.href}
+        href=${this.disabled ? nothing : this.href}
+        role=${this.disabled ? 'link' : nothing}
         aria-label=${this.label ? this.label : nothing}
-        ?disabled=${this.disabled}
+        aria-disabled=${this.disabled ? 'true' : nothing}
+        tabindex=${this.disabled ? '-1' : nothing}
+        title=${this.buttonTitle || nothing}
+        @click=${this._handleAnchorClick}
       >
         ${this.renderContent()}
       </a>
@@ -197,4 +211,11 @@ export class LitDevRippleIconButton extends LitElement {
     return html`<div id="ripple"></div>
       <slot></slot>`;
   }
+
+  private _handleAnchorClick(event: MouseEvent) {
+    if (this.disabled) {
+      event.preventDefault();
+      event.stopImmediatePropagation();
+    }
+  }
 }

packages/lit-dev-content/src/components/litdev-tutorial.ts

@@ -363,11 +363,9 @@ export class LitDevTutorial extends LitElement {
   protected renderHeader() {
     return html`<div id="tutorialHeader">
       <div class="lhs">
-        <a href="/tutorials/" tabindex="-1">
-          <litdev-ripple-icon-button label="Tutorial Catalog">
-            ${catalogIcon}
-          </litdev-ripple-icon-button>
-        </a>
+        <litdev-ripple-icon-button label="Tutorial Catalog" href="/tutorials/">
+          ${catalogIcon}
+        </litdev-ripple-icon-button>
         <span class="tutorial-metadata">
           ${this._manifestTask.render({
             complete: (manifest) => html` <span class="tutorial-title"