Use popover for hamburger navigation menu

src/_includes/global/navbar.njk

@@ -1,6 +1,3 @@
-{# Accessible hamburger menu code based on:
-https://kalechips.net/projects/snippets/burger #}
-
 {% set navLinksEl %}
     {%- if tags and tags.includes("shrine pages") %}
         <li>
@@ -15,131 +12,86 @@ https://kalechips.net/projects/snippets/burger #}
 {% endset %}
 
 <nav class="navbar" aria-labelledby="top-level-nav-title">
-    <h2 class="visually-hidden" id="top-level-nav-title">Top Level Navigation Bar</h2>
+    <h2 class="visually-hidden" id="top-level-nav-title">Top Level</h2>
-    <details class="navbar__burger">
+    <ul class="navbar__menu navbar__links">{{ navLinksEl | safe }}</ul>
-        <summary class="navbar__toggle" id="navbar-toggle">
+    <button class="navbar__toggle" popovertarget="nav-menu" aria-labelledby="nav-toggle-title">
-            <svg aria-hidden="true" width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+        <svg aria-hidden="true" focusable="false" width="1em" height="1em" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--!Font Awesome Free 6.6.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free Copyright 2024 Fonticons, Inc.--><path d="M0 96C0 78.3 14.3 64 32 64l384 0c17.7 0 32 14.3 32 32s-14.3 32-32 32L32 128C14.3 128 0 113.7 0 96zM0 256c0-17.7 14.3-32 32-32l384 0c17.7 0 32 14.3 32 32s-14.3 32-32 32L32 288c-17.7 0-32-14.3-32-32zM448 416c0 17.7-14.3 32-32 32L32 448c-17.7 0-32-14.3-32-32s14.3-32 32-32l384 0c17.7 0 32 14.3 32 32z"/></svg>
-                <path d="M4 6H20M4 12H20M4 18H20" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
-            </svg>
         Navigation
-        </summary>
+    </button>
-        <nav class="navbar__menu" aria-labelledby="hamburger-nav-title">
-            <h3 class="visually-hidden" id="hamburger-nav-title">Hamburger Menu</h3>
-            <ul class="navbar__menu--links">
-                {{ navLinksEl | safe }}
-                <li class="skip"><a href="#navbar-toggle">Close Menu</a></li>
-            </ul>
-        </nav>
-    </details>
-    <ul class="navbar__links">
-        {{ navLinksEl | safe }}
-    </ul>
 </nav>
+<div popover id="nav-menu" class="navbar__popover">
+    <ul class="navbar__menu">{{ navLinksEl | safe }}</ul>
+</div>
 
 {%- css %}
-    :root {
-        --icon-burger: url(/assets/icons/burger.svg);
-        --icon-close: url(/assets/icons/close.svg);
-        --sz-icon: 2.5rem;
-    }
-
     .navbar {
         background: var(--clr-navbar-bg);
         width: 100%;
         z-index: 998;
         position: sticky;
         top: 0;
-    }
+        padding: 0.6em;
-
-    .navbar__toggle {
-        color: var(--clr-navbar-link);
-        font-size: 1.25rem;
-        font-weight: 700;
-    }
-
-    .navbar__toggle {
-        list-style-type: none;
-        display: flex;
-        align-items: center;
-        gap: 0.3em;
-        padding: 0.4em 0.6em;
-        background-color: inherit;
-    }
-
-    .navbar__toggle::-webkit-details-marker { display: none; }
-
-    .navbar__toggle:focus,
-    .navbar a:focus {
-        outline: 0.15em solid var(--clr-navbar-link);
     }
 
     .navbar a:focus { outline-offset: 0.1em; }
 
-    .navbar__menu--links,
+    .navbar__toggle {
-    .navbar__links {
+        background-color: inherit;
-        list-style-type: "";
+        color: var(--clr-navbar-link);
-        flex-wrap: wrap;
+        border: none;
-        gap: 1em;
+        padding: 0;
+        font-size: 1.25rem;
+        font-weight: 700;
+        display: flex;
+        align-items: center;
+        gap: 0.3em;
     }
 
-    .navbar__menu--links a,
+    .navbar__toggle svg { fill: currentColor; }
-    .navbar__links a {
+    .navbar__toggle:focus,
+    .navbar a:focus { outline: 0.15em solid var(--clr-navbar-link); }
+
+    .navbar__menu {
+        list-style-type: "";
+        margin: 0;
+        padding: 0;
+        display: grid;
+        gap: 1.5em;
+        text-align: center;
+    }
+
+    .navbar__menu a {
         color: var(--clr-navbar-link);
         text-decoration: none;
         cursor: pointer;
-        display: block;
+        display: inline-block;
     }
 
-    .navbar__menu--links {
+    .navbar__menu a:hover { color: var(--clr-link-hover); }
-        display: flex;
+    .navbar__menu a:focus { outline-offset: 0.2em; }
-        padding: 0 1em;
+    .navbar__links { display: none; }
+
+    .navbar__popover {
+        background-color: var(--clr-navbar-bg);
+        border: 0.15em solid var(--clr-navbar-link);
+        padding: 1.5em;
+        width: 80%;
     }
 
-    .skip a {
+    .navbar__popover::backdrop {
-        position: absolute;
+        background-color: black;
-        left: -10000px;
+        opacity: 0.5;
-        top: auto;
-        width: 1px;
-        height: 1px;
-        overflow: hidden;
     }
 
-    .skip a:focus {
-        position: static;
-        width: auto;
-        height: auto;
-    }
-
-    .navbar__links {
-        display: none;
-        padding: 0.2em 0 0 0;
-    }
-
-    .navbar__links a:hover { color: var(--clr-link-hover); }
-    .navbar__links a:focus { outline-offset: 0.2em; }
-
     /* Tablet screen size */
     @media only screen and (min-width: 43.75rem) {
-        .navbar { padding: 0 0.6em; }
+        .navbar { padding: 1em 0.6em; }
-        .navbar__burger { display: none; }
         .navbar__toggle { display: none; }
 
         .navbar__links {
             display: flex;
             justify-content: space-evenly;
             gap: 0.5em;
-            padding: 0;
         }
     }
 {% endcss %}
-
-{%- js %}
-    const navbarBurger = document.querySelector(".navbar__burger");
-    navbarBurger.addEventListener("keydown", (event) => {
-        if (event.key == "Escape") {
-            navbarBurger.removeAttribute("open");
-            navbarBurger.ariaExpanded = false;
-            document.querySelector(".navbar__toggle").focus();
-        }
-    });
-{% endjs %}

src/assets/css/general.css

@@ -81,8 +81,6 @@ blockquote > * + :not([class]),
 .c-blockquote__attribution { margin-top: var(--sz-paragraph-margin); }
 
 button:hover { cursor: pointer; }
-
-button:focus,
 details:focus { outline-offset: 0.2em; }
 
 figure {

src/statements/colophon.md

@@ -1,7 +1,7 @@
 ---
 title: Colophon
 keyword: colophon page
-updated: 2024-07-18
+updated: 2024-07-20
 toc: true
 eleventyNavigation:
     order: 14
@@ -54,7 +54,6 @@ Due to this website being a static site, JavaScript is used to create dynamic an
         * [{% cite "Star Wars: Knights of the Old Republic" %}](/shrines/starwarskotor)
         * [{% cite "Cassette Beasts" %}](/shrines/cassettebeasts)
     * Birthdays of characters from {% cite "A Summer’s End — Hong Kong 1986" %} on its shrine.
-* When this site is viewed on mobile devices, the navigation bar's hamburger menu uses JavaScript to enable using the Escape key to close the navigation manu.
 * Scott O'Hara's [ARIA Tooltips](https://github.com/scottaohara/a11y_tooltips) script is used to implement accessible tooltips that meet Web Content Accessibility Guidelines (WCAG) 2.2 success criterion for [1.4.13: Content on Hover or Focus (Level AA)](https://www.w3.org/WAI/WCAG22/Understanding/content-on-hover-or-focus.html), by allowing visitors to see tooltips on keyboard focus and dismiss tooltips by pressing the Escape key.
 * Zach Leatherman's [details-utils](https://www.npmjs.com/package/@zachleat/details-utils) JavaScript package is used to automatically expand sidebar table of contents on wide screens.
 * [status.cafe](https://status.cafe/) widget, which is placed on the home page, uses JavaScript to fetch data of my latest status update.