From c64e587335130fbc228f7b1e85cd4b01899170cf Mon Sep 17 00:00:00 2001
From: Cotes Chung <11371340+cotes2020@users.noreply.github.com>
Date: Tue, 7 Dec 2021 18:17:20 +0800
Subject: [PATCH 1/2] Improve SEO & accessibility on mode toggle element

---
 _includes/sidebar.html             |  6 +++---
 _javascript/commons/mode-toggle.js | 13 ++++++++-----
 _sass/addon/commons.scss           | 24 ++++++++++++++++++++----
 assets/js/dist/categories.min.js   |  2 +-
 assets/js/dist/commons.min.js      |  2 +-
 assets/js/dist/home.min.js         |  2 +-
 assets/js/dist/page.min.js         |  2 +-
 assets/js/dist/post.min.js         |  2 +-
 8 files changed, 36 insertions(+), 17 deletions(-)

diff --git a/_includes/sidebar.html b/_includes/sidebar.html
index 5974fce..c79f901 100644
--- a/_includes/sidebar.html
+++ b/_includes/sidebar.html
@@ -54,9 +54,9 @@
   <div class="sidebar-bottom mt-auto d-flex flex-wrap justify-content-center align-items-center">
 
     {% unless site.theme_mode %}
-      <a id="mode-toggle-wrapper" tabindex="0" onclick="flipMode()">
-        <i class="mode-toggle fas fa-adjust"></i>
-      </a>
+      <button class="mode-toggle btn" aria-label="Switch Mode">
+        <i class="fas fa-adjust"></i>
+      </button>
 
       {% if site.data.contact.size > 0 %}
         <span class="icon-border"></span>
diff --git a/_javascript/commons/mode-toggle.js b/_javascript/commons/mode-toggle.js
index 7d4926e..1a3b3d6 100644
--- a/_javascript/commons/mode-toggle.js
+++ b/_javascript/commons/mode-toggle.js
@@ -1,10 +1,13 @@
 /*
- * Document-reday functions for '#mode-toggle-wrapper'
+ * Listener for theme mode toggle
  */
 $(function() {
-  $("#mode-toggle-wrapper").keyup((e) => {
-    if(e.keyCode === 13) {
-      flipMode();
-    }
+  $(".mode-toggle").click((e) => {
+    const $target = $(e.target);
+    let $btn = ($target.prop("tagName") === "button".toUpperCase() ?
+      $target : $target.parent());
+
+    $btn.blur(); // remove the clicking outline
+    flipMode();
   });
 });
diff --git a/_sass/addon/commons.scss b/_sass/addon/commons.scss
index dc8e264..faae717 100644
--- a/_sass/addon/commons.scss
+++ b/_sass/addon/commons.scss
@@ -775,7 +775,6 @@ $sidebar-display: "sidebar-display";
   } // ul
 
   .sidebar-bottom {
-    font-size: 1.2rem;
     margin-bottom: 2.1rem;
 
     @include ml-mr(auto);
@@ -792,10 +791,26 @@ $sidebar-display: "sidebar-display";
     }
 
     i {
-      line-height: 1.75rem; // default line-height in body
-      vertical-align: middle;
+      font-size: 1.2rem;
+      line-height: 1.75rem;
+    }
 
-      @extend %cursor-pointer;
+    .mode-toggle {
+      padding: 0;
+      border: 0;
+      margin-bottom: 1px;
+      background-color: transparent;
+
+      @extend %icon;
+      @extend %sidebar-links;
+
+      > i {
+        @extend %clickable-transition;
+      }
+
+      &:hover > i {
+        color: var(--sidebar-active-color);
+      }
     }
 
     .icon-border {
@@ -1627,6 +1642,7 @@ $sidebar-display: "sidebar-display";
       }
 
       > span,
+      > button.mode-toggle,
       > a {
         @include ml-mr(0.15rem);
 
diff --git a/assets/js/dist/categories.min.js b/assets/js/dist/categories.min.js
index 1116110..8cb8fb1 100644
--- a/assets/js/dist/categories.min.js
+++ b/assets/js/dist/categories.min.js
@@ -3,4 +3,4 @@
  * © 2019 Cotes Chung
  * MIT Licensed
  */
-$(function(){$(window).scroll(()=>{50<$(this).scrollTop()&&"none"===$("#sidebar-trigger").css("display")?$("#back-to-top").fadeIn():$("#back-to-top").fadeOut()}),$("#back-to-top").click(()=>($("body,html").animate({scrollTop:0},800),!1))}),$(function(){$("#mode-toggle-wrapper").keyup(e=>{13===e.keyCode&&flipMode()})}),$(function(){const e=$("#sidebar-trigger"),o=$("#search-trigger"),s=$("#search-cancel"),t=$("#search-cleaner"),a=$("#main"),l=$("#topbar-title"),n=$("#search-wrapper"),r=$("#search-result-wrapper"),d=$("#search-results"),i=$("#search-input"),c=$("#search-hints"),u=function(){let e=0;return{block(){e=window.scrollY,$("html,body").scrollTop(0)},release(){$("html,body").scrollTop(e)},getOffset(){return e}}}(),f={on(){e.addClass("unloaded"),l.addClass("unloaded"),o.addClass("unloaded"),n.addClass("d-flex"),s.addClass("loaded")},off(){s.removeClass("loaded"),n.removeClass("d-flex"),e.removeClass("unloaded"),l.removeClass("unloaded"),o.removeClass("unloaded")}},p=function(){let e=!1;return{on(){e||(u.block(),r.removeClass("unloaded"),a.addClass("unloaded"),e=!0)},off(){e&&(d.empty(),c.hasClass("unloaded")&&c.removeClass("unloaded"),r.addClass("unloaded"),t.removeClass("visible"),a.removeClass("unloaded"),u.release(),i.val(""),e=!1)},isVisible(){return e}}}();function h(){return s.hasClass("loaded")}o.click(function(){f.on(),p.on(),i.focus()}),s.click(function(){f.off(),p.off()}),i.focus(function(){n.addClass("input-focus")}),i.focusout(function(){n.removeClass("input-focus")}),i.on("keyup",function(e){8===e.keyCode&&""===i.val()?h()?c.removeClass("unloaded"):p.off():""!==i.val()&&(p.on(),t.hasClass("visible")||t.addClass("visible"),h()&&c.addClass("unloaded"))}),t.on("click",function(){i.val(""),h()?(c.removeClass("unloaded"),d.empty()):p.off(),i.focus(),t.removeClass("visible")})}),$(function(){var e=function(){const e="sidebar-display";let o=!1;const s=$("body");return{toggle(){!1===o?s.attr(e,""):s.removeAttr(e),o=!o}}}();$("#sidebar-trigger").click(e.toggle),$("#mask").click(e.toggle)}),$(function(){$('[data-toggle="tooltip"]').tooltip()}),$(function(){const o=$("#topbar-wrapper"),s=$("#toc-wrapper"),t=$(".access"),a=$("#search-input");let l,n=0;const r=o.outerHeight();$(window).scroll(function(e){$("#topbar-title").is(":hidden")&&(l=!0)}),setInterval(function(){l&&(function(){var e=$(this).scrollTop();Math.abs(n-e)<=5||(e>n&&e>r?(o.removeClass("topbar-down").addClass("topbar-up"),0<s.length&&s.removeClass("topbar-down"),0<t.length&&t.removeClass("topbar-down"),a.is(":focus")&&a.blur()):e+$(window).height()<$(document).height()&&(o.removeClass("topbar-up").addClass("topbar-down"),0<s.length&&s.addClass("topbar-down"),0<t.length&&t.addClass("topbar-down")),n=e)}(),l=!1)},250)}),$(function(){const e=$("#topbar-title"),o=$("div.post>h1"),s=e.text().trim();let t=(0<o.length?o:$("h1")).text().trim();($("#page-category").length||$("#page-tag").length)&&/\s/.test(t)&&(t=t.replace(/[0-9]/g,"").trim()),$(window).scroll(function(){return!($("#post-list").length||o.is(":hidden")||e.is(":hidden")||$("#sidebar.sidebar-expand").length)&&void(95<=$(this).scrollTop()?e.text()!==t&&e.text(t):e.text()!==s&&e.text(s))}),e.click(function(){$("body,html").animate({scrollTop:0},800)})}),$(function(){const e=$(".collapse");e.on("hide.bs.collapse",function(){var e="h_"+$(this).attr("id").substring("l_".length);e&&($(`#${e} .far.fa-folder-open`).attr("class","far fa-folder fa-fw"),$(`#${e} i.fas`).addClass("rotate"),$("#"+e).removeClass("hide-border-bottom"))}),e.on("show.bs.collapse",function(){var e="h_"+$(this).attr("id").substring("l_".length);e&&($(`#${e} .far.fa-folder`).attr("class","far fa-folder-open fa-fw"),$(`#${e} i.fas`).removeClass("rotate"),$("#"+e).addClass("hide-border-bottom"))})});
\ No newline at end of file
+$(function(){$(window).scroll(()=>{50<$(this).scrollTop()&&"none"===$("#sidebar-trigger").css("display")?$("#back-to-top").fadeIn():$("#back-to-top").fadeOut()}),$("#back-to-top").click(()=>($("body,html").animate({scrollTop:0},800),!1))}),$(function(){$(".mode-toggle").click(e=>{const o=$(e.target);let t=o.prop("tagName")==="button".toUpperCase()?o:o.parent();t.blur(),flipMode()})}),$(function(){const e=$("#sidebar-trigger"),o=$("#search-trigger"),t=$("#search-cancel"),s=$("#search-cleaner"),a=$("#main"),l=$("#topbar-title"),n=$("#search-wrapper"),r=$("#search-result-wrapper"),d=$("#search-results"),i=$("#search-input"),c=$("#search-hints"),u=function(){let e=0;return{block(){e=window.scrollY,$("html,body").scrollTop(0)},release(){$("html,body").scrollTop(e)},getOffset(){return e}}}(),f={on(){e.addClass("unloaded"),l.addClass("unloaded"),o.addClass("unloaded"),n.addClass("d-flex"),t.addClass("loaded")},off(){t.removeClass("loaded"),n.removeClass("d-flex"),e.removeClass("unloaded"),l.removeClass("unloaded"),o.removeClass("unloaded")}},p=function(){let e=!1;return{on(){e||(u.block(),r.removeClass("unloaded"),a.addClass("unloaded"),e=!0)},off(){e&&(d.empty(),c.hasClass("unloaded")&&c.removeClass("unloaded"),r.addClass("unloaded"),s.removeClass("visible"),a.removeClass("unloaded"),u.release(),i.val(""),e=!1)},isVisible(){return e}}}();function h(){return t.hasClass("loaded")}o.click(function(){f.on(),p.on(),i.focus()}),t.click(function(){f.off(),p.off()}),i.focus(function(){n.addClass("input-focus")}),i.focusout(function(){n.removeClass("input-focus")}),i.on("keyup",function(e){8===e.keyCode&&""===i.val()?h()?c.removeClass("unloaded"):p.off():""!==i.val()&&(p.on(),s.hasClass("visible")||s.addClass("visible"),h()&&c.addClass("unloaded"))}),s.on("click",function(){i.val(""),h()?(c.removeClass("unloaded"),d.empty()):p.off(),i.focus(),s.removeClass("visible")})}),$(function(){var e=function(){const e="sidebar-display";let o=!1;const t=$("body");return{toggle(){!1===o?t.attr(e,""):t.removeAttr(e),o=!o}}}();$("#sidebar-trigger").click(e.toggle),$("#mask").click(e.toggle)}),$(function(){$('[data-toggle="tooltip"]').tooltip()}),$(function(){const o=$("#topbar-wrapper"),t=$("#toc-wrapper"),s=$(".access"),a=$("#search-input");let l,n=0;const r=o.outerHeight();$(window).scroll(function(e){$("#topbar-title").is(":hidden")&&(l=!0)}),setInterval(function(){l&&(function(){var e=$(this).scrollTop();Math.abs(n-e)<=5||(e>n&&e>r?(o.removeClass("topbar-down").addClass("topbar-up"),0<t.length&&t.removeClass("topbar-down"),0<s.length&&s.removeClass("topbar-down"),a.is(":focus")&&a.blur()):e+$(window).height()<$(document).height()&&(o.removeClass("topbar-up").addClass("topbar-down"),0<t.length&&t.addClass("topbar-down"),0<s.length&&s.addClass("topbar-down")),n=e)}(),l=!1)},250)}),$(function(){const e=$("#topbar-title"),o=$("div.post>h1"),t=e.text().trim();let s=(0<o.length?o:$("h1")).text().trim();($("#page-category").length||$("#page-tag").length)&&/\s/.test(s)&&(s=s.replace(/[0-9]/g,"").trim()),$(window).scroll(function(){return!($("#post-list").length||o.is(":hidden")||e.is(":hidden")||$("#sidebar.sidebar-expand").length)&&void(95<=$(this).scrollTop()?e.text()!==s&&e.text(s):e.text()!==t&&e.text(t))}),e.click(function(){$("body,html").animate({scrollTop:0},800)})}),$(function(){const e=$(".collapse");e.on("hide.bs.collapse",function(){var e="h_"+$(this).attr("id").substring("l_".length);e&&($(`#${e} .far.fa-folder-open`).attr("class","far fa-folder fa-fw"),$(`#${e} i.fas`).addClass("rotate"),$("#"+e).removeClass("hide-border-bottom"))}),e.on("show.bs.collapse",function(){var e="h_"+$(this).attr("id").substring("l_".length);e&&($(`#${e} .far.fa-folder`).attr("class","far fa-folder-open fa-fw"),$(`#${e} i.fas`).removeClass("rotate"),$("#"+e).addClass("hide-border-bottom"))})});
\ No newline at end of file
diff --git a/assets/js/dist/commons.min.js b/assets/js/dist/commons.min.js
index 8d5402c..149b030 100644
--- a/assets/js/dist/commons.min.js
+++ b/assets/js/dist/commons.min.js
@@ -3,4 +3,4 @@
  * © 2019 Cotes Chung
  * MIT Licensed
  */
-$(function(){$(window).scroll(()=>{50<$(this).scrollTop()&&"none"===$("#sidebar-trigger").css("display")?$("#back-to-top").fadeIn():$("#back-to-top").fadeOut()}),$("#back-to-top").click(()=>($("body,html").animate({scrollTop:0},800),!1))}),$(function(){$("#mode-toggle-wrapper").keyup(e=>{13===e.keyCode&&flipMode()})}),$(function(){const e=$("#sidebar-trigger"),o=$("#search-trigger"),s=$("#search-cancel"),t=$("#search-cleaner"),a=$("#main"),l=$("#topbar-title"),n=$("#search-wrapper"),d=$("#search-result-wrapper"),r=$("#search-results"),i=$("#search-input"),c=$("#search-hints"),u=function(){let e=0;return{block(){e=window.scrollY,$("html,body").scrollTop(0)},release(){$("html,body").scrollTop(e)},getOffset(){return e}}}(),p={on(){e.addClass("unloaded"),l.addClass("unloaded"),o.addClass("unloaded"),n.addClass("d-flex"),s.addClass("loaded")},off(){s.removeClass("loaded"),n.removeClass("d-flex"),e.removeClass("unloaded"),l.removeClass("unloaded"),o.removeClass("unloaded")}},f=function(){let e=!1;return{on(){e||(u.block(),d.removeClass("unloaded"),a.addClass("unloaded"),e=!0)},off(){e&&(r.empty(),c.hasClass("unloaded")&&c.removeClass("unloaded"),d.addClass("unloaded"),t.removeClass("visible"),a.removeClass("unloaded"),u.release(),i.val(""),e=!1)},isVisible(){return e}}}();function h(){return s.hasClass("loaded")}o.click(function(){p.on(),f.on(),i.focus()}),s.click(function(){p.off(),f.off()}),i.focus(function(){n.addClass("input-focus")}),i.focusout(function(){n.removeClass("input-focus")}),i.on("keyup",function(e){8===e.keyCode&&""===i.val()?h()?c.removeClass("unloaded"):f.off():""!==i.val()&&(f.on(),t.hasClass("visible")||t.addClass("visible"),h()&&c.addClass("unloaded"))}),t.on("click",function(){i.val(""),h()?(c.removeClass("unloaded"),r.empty()):f.off(),i.focus(),t.removeClass("visible")})}),$(function(){var e=function(){const e="sidebar-display";let o=!1;const s=$("body");return{toggle(){!1===o?s.attr(e,""):s.removeAttr(e),o=!o}}}();$("#sidebar-trigger").click(e.toggle),$("#mask").click(e.toggle)}),$(function(){$('[data-toggle="tooltip"]').tooltip()}),$(function(){const o=$("#topbar-wrapper"),s=$("#toc-wrapper"),t=$(".access"),a=$("#search-input");let l,n=0;const d=o.outerHeight();$(window).scroll(function(e){$("#topbar-title").is(":hidden")&&(l=!0)}),setInterval(function(){l&&(function(){var e=$(this).scrollTop();Math.abs(n-e)<=5||(e>n&&e>d?(o.removeClass("topbar-down").addClass("topbar-up"),0<s.length&&s.removeClass("topbar-down"),0<t.length&&t.removeClass("topbar-down"),a.is(":focus")&&a.blur()):e+$(window).height()<$(document).height()&&(o.removeClass("topbar-up").addClass("topbar-down"),0<s.length&&s.addClass("topbar-down"),0<t.length&&t.addClass("topbar-down")),n=e)}(),l=!1)},250)}),$(function(){const e=$("#topbar-title"),o=$("div.post>h1"),s=e.text().trim();let t=(0<o.length?o:$("h1")).text().trim();($("#page-category").length||$("#page-tag").length)&&/\s/.test(t)&&(t=t.replace(/[0-9]/g,"").trim()),$(window).scroll(function(){return!($("#post-list").length||o.is(":hidden")||e.is(":hidden")||$("#sidebar.sidebar-expand").length)&&void(95<=$(this).scrollTop()?e.text()!==t&&e.text(t):e.text()!==s&&e.text(s))}),e.click(function(){$("body,html").animate({scrollTop:0},800)})});
\ No newline at end of file
+$(function(){$(window).scroll(()=>{50<$(this).scrollTop()&&"none"===$("#sidebar-trigger").css("display")?$("#back-to-top").fadeIn():$("#back-to-top").fadeOut()}),$("#back-to-top").click(()=>($("body,html").animate({scrollTop:0},800),!1))}),$(function(){$(".mode-toggle").click(e=>{const o=$(e.target);let t=o.prop("tagName")==="button".toUpperCase()?o:o.parent();t.blur(),flipMode()})}),$(function(){const e=$("#sidebar-trigger"),o=$("#search-trigger"),t=$("#search-cancel"),s=$("#search-cleaner"),a=$("#main"),l=$("#topbar-title"),n=$("#search-wrapper"),r=$("#search-result-wrapper"),d=$("#search-results"),i=$("#search-input"),c=$("#search-hints"),u=function(){let e=0;return{block(){e=window.scrollY,$("html,body").scrollTop(0)},release(){$("html,body").scrollTop(e)},getOffset(){return e}}}(),p={on(){e.addClass("unloaded"),l.addClass("unloaded"),o.addClass("unloaded"),n.addClass("d-flex"),t.addClass("loaded")},off(){t.removeClass("loaded"),n.removeClass("d-flex"),e.removeClass("unloaded"),l.removeClass("unloaded"),o.removeClass("unloaded")}},f=function(){let e=!1;return{on(){e||(u.block(),r.removeClass("unloaded"),a.addClass("unloaded"),e=!0)},off(){e&&(d.empty(),c.hasClass("unloaded")&&c.removeClass("unloaded"),r.addClass("unloaded"),s.removeClass("visible"),a.removeClass("unloaded"),u.release(),i.val(""),e=!1)},isVisible(){return e}}}();function h(){return t.hasClass("loaded")}o.click(function(){p.on(),f.on(),i.focus()}),t.click(function(){p.off(),f.off()}),i.focus(function(){n.addClass("input-focus")}),i.focusout(function(){n.removeClass("input-focus")}),i.on("keyup",function(e){8===e.keyCode&&""===i.val()?h()?c.removeClass("unloaded"):f.off():""!==i.val()&&(f.on(),s.hasClass("visible")||s.addClass("visible"),h()&&c.addClass("unloaded"))}),s.on("click",function(){i.val(""),h()?(c.removeClass("unloaded"),d.empty()):f.off(),i.focus(),s.removeClass("visible")})}),$(function(){var e=function(){const e="sidebar-display";let o=!1;const t=$("body");return{toggle(){!1===o?t.attr(e,""):t.removeAttr(e),o=!o}}}();$("#sidebar-trigger").click(e.toggle),$("#mask").click(e.toggle)}),$(function(){$('[data-toggle="tooltip"]').tooltip()}),$(function(){const o=$("#topbar-wrapper"),t=$("#toc-wrapper"),s=$(".access"),a=$("#search-input");let l,n=0;const r=o.outerHeight();$(window).scroll(function(e){$("#topbar-title").is(":hidden")&&(l=!0)}),setInterval(function(){l&&(function(){var e=$(this).scrollTop();Math.abs(n-e)<=5||(e>n&&e>r?(o.removeClass("topbar-down").addClass("topbar-up"),0<t.length&&t.removeClass("topbar-down"),0<s.length&&s.removeClass("topbar-down"),a.is(":focus")&&a.blur()):e+$(window).height()<$(document).height()&&(o.removeClass("topbar-up").addClass("topbar-down"),0<t.length&&t.addClass("topbar-down"),0<s.length&&s.addClass("topbar-down")),n=e)}(),l=!1)},250)}),$(function(){const e=$("#topbar-title"),o=$("div.post>h1"),t=e.text().trim();let s=(0<o.length?o:$("h1")).text().trim();($("#page-category").length||$("#page-tag").length)&&/\s/.test(s)&&(s=s.replace(/[0-9]/g,"").trim()),$(window).scroll(function(){return!($("#post-list").length||o.is(":hidden")||e.is(":hidden")||$("#sidebar.sidebar-expand").length)&&void(95<=$(this).scrollTop()?e.text()!==s&&e.text(s):e.text()!==t&&e.text(t))}),e.click(function(){$("body,html").animate({scrollTop:0},800)})});
\ No newline at end of file
diff --git a/assets/js/dist/home.min.js b/assets/js/dist/home.min.js
index 36e44e3..a43b848 100644
--- a/assets/js/dist/home.min.js
+++ b/assets/js/dist/home.min.js
@@ -3,4 +3,4 @@
  * © 2019 Cotes Chung
  * MIT Licensed
  */
-$(function(){$(window).scroll(()=>{50<$(this).scrollTop()&&"none"===$("#sidebar-trigger").css("display")?$("#back-to-top").fadeIn():$("#back-to-top").fadeOut()}),$("#back-to-top").click(()=>($("body,html").animate({scrollTop:0},800),!1))}),$(function(){$("#mode-toggle-wrapper").keyup(t=>{13===t.keyCode&&flipMode()})}),$(function(){const t=$("#sidebar-trigger"),e=$("#search-trigger"),o=$("#search-cancel"),a=$("#search-cleaner"),s=$("#main"),n=$("#topbar-title"),l=$("#search-wrapper"),r=$("#search-result-wrapper"),d=$("#search-results"),i=$("#search-input"),c=$("#search-hints"),u=function(){let t=0;return{block(){t=window.scrollY,$("html,body").scrollTop(0)},release(){$("html,body").scrollTop(t)},getOffset(){return t}}}(),p={on(){t.addClass("unloaded"),n.addClass("unloaded"),e.addClass("unloaded"),l.addClass("d-flex"),o.addClass("loaded")},off(){o.removeClass("loaded"),l.removeClass("d-flex"),t.removeClass("unloaded"),n.removeClass("unloaded"),e.removeClass("unloaded")}},f=function(){let t=!1;return{on(){t||(u.block(),r.removeClass("unloaded"),s.addClass("unloaded"),t=!0)},off(){t&&(d.empty(),c.hasClass("unloaded")&&c.removeClass("unloaded"),r.addClass("unloaded"),a.removeClass("visible"),s.removeClass("unloaded"),u.release(),i.val(""),t=!1)},isVisible(){return t}}}();function h(){return o.hasClass("loaded")}e.click(function(){p.on(),f.on(),i.focus()}),o.click(function(){p.off(),f.off()}),i.focus(function(){l.addClass("input-focus")}),i.focusout(function(){l.removeClass("input-focus")}),i.on("keyup",function(t){8===t.keyCode&&""===i.val()?h()?c.removeClass("unloaded"):f.off():""!==i.val()&&(f.on(),a.hasClass("visible")||a.addClass("visible"),h()&&c.addClass("unloaded"))}),a.on("click",function(){i.val(""),h()?(c.removeClass("unloaded"),d.empty()):f.off(),i.focus(),a.removeClass("visible")})}),$(function(){var t=function(){const t="sidebar-display";let e=!1;const o=$("body");return{toggle(){!1===e?o.attr(t,""):o.removeAttr(t),e=!e}}}();$("#sidebar-trigger").click(t.toggle),$("#mask").click(t.toggle)}),$(function(){$('[data-toggle="tooltip"]').tooltip()}),$(function(){const e=$("#topbar-wrapper"),o=$("#toc-wrapper"),a=$(".access"),s=$("#search-input");let n,l=0;const r=e.outerHeight();$(window).scroll(function(t){$("#topbar-title").is(":hidden")&&(n=!0)}),setInterval(function(){n&&(function(){var t=$(this).scrollTop();Math.abs(l-t)<=5||(t>l&&t>r?(e.removeClass("topbar-down").addClass("topbar-up"),0<o.length&&o.removeClass("topbar-down"),0<a.length&&a.removeClass("topbar-down"),s.is(":focus")&&s.blur()):t+$(window).height()<$(document).height()&&(e.removeClass("topbar-up").addClass("topbar-down"),0<o.length&&o.addClass("topbar-down"),0<a.length&&a.addClass("topbar-down")),l=t)}(),n=!1)},250)}),$(function(){const t=$("#topbar-title"),e=$("div.post>h1"),o=t.text().trim();let a=(0<e.length?e:$("h1")).text().trim();($("#page-category").length||$("#page-tag").length)&&/\s/.test(a)&&(a=a.replace(/[0-9]/g,"").trim()),$(window).scroll(function(){return!($("#post-list").length||e.is(":hidden")||t.is(":hidden")||$("#sidebar.sidebar-expand").length)&&void(95<=$(this).scrollTop()?t.text()!==a&&t.text(a):t.text()!==o&&t.text(o))}),t.click(function(){$("body,html").animate({scrollTop:0},800)})}),$(function(){let o=$(".timeago").length,t=void 0;const s=$("meta[name=day-prompt]").attr("content"),n=$("meta[name=hour-prompt]").attr("content"),l=$("meta[name=minute-prompt]").attr("content"),r=$("meta[name=justnow-prompt]").attr("content");function e(){return $(".timeago").each(function(){var t,e;!1!==$(this)[0].hasAttribute("date")?(e=function(t,e){let o=new Date,a=new Date(t);return a.getFullYear()!==o.getFullYear()||a.getMonth()!==o.getMonth()?e:(t=Math.floor((o-a)/1e3),1<=(e=Math.floor(t/86400))?` ${e} `+s:1<=(e=Math.floor(t/3600))?` ${e} `+n:1<=(t=Math.floor(t/60))?` ${t} `+l:r)}($(this).attr("date"),t=$(this).text()))===t?$(this).removeAttr("date"):$(this).text(e):--o}),0===o&&void 0!==t&&clearInterval(t),o}0!==o&&0<e()&&(t=setInterval(e,6e4))});
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diff --git a/assets/js/dist/page.min.js b/assets/js/dist/page.min.js
index 1d1fd6c..eafe775 100644
--- a/assets/js/dist/page.min.js
+++ b/assets/js/dist/page.min.js
@@ -3,4 +3,4 @@
  * © 2019 Cotes Chung
  * MIT Licensed
  */
-$(function(){$(window).scroll(()=>{50<$(this).scrollTop()&&"none"===$("#sidebar-trigger").css("display")?$("#back-to-top").fadeIn():$("#back-to-top").fadeOut()}),$("#back-to-top").click(()=>($("body,html").animate({scrollTop:0},800),!1))}),$(function(){$("#mode-toggle-wrapper").keyup(e=>{13===e.keyCode&&flipMode()})}),$(function(){const e=$("#sidebar-trigger"),t=$("#search-trigger"),o=$("#search-cancel"),a=$("#search-cleaner"),l=$("#main"),s=$("#topbar-title"),n=$("#search-wrapper"),i=$("#search-result-wrapper"),r=$("#search-results"),c=$("#search-input"),d=$("#search-hints"),u=function(){let e=0;return{block(){e=window.scrollY,$("html,body").scrollTop(0)},release(){$("html,body").scrollTop(e)},getOffset(){return e}}}(),p={on(){e.addClass("unloaded"),s.addClass("unloaded"),t.addClass("unloaded"),n.addClass("d-flex"),o.addClass("loaded")},off(){o.removeClass("loaded"),n.removeClass("d-flex"),e.removeClass("unloaded"),s.removeClass("unloaded"),t.removeClass("unloaded")}},f=function(){let e=!1;return{on(){e||(u.block(),i.removeClass("unloaded"),l.addClass("unloaded"),e=!0)},off(){e&&(r.empty(),d.hasClass("unloaded")&&d.removeClass("unloaded"),i.addClass("unloaded"),a.removeClass("visible"),l.removeClass("unloaded"),u.release(),c.val(""),e=!1)},isVisible(){return e}}}();function h(){return 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t="EM"===e.prop("tagName")?e.text():"",o=$(this).attr("data-src");$(this).wrap(`<a href="${o}" title="${t}" class="popup"></a>`)}),$(".popup").magnificPopup({type:"image",closeOnContentClick:!0,showCloseBtn:!1,zoom:{enabled:!0,duration:300,easing:"ease-in-out"}}),$(e+" a").has("img").addClass("img-link")}}),$(function(){var e=".code-header>button";const t="timeout";function l(e){if($(e)[0].hasAttribute(t)){e=$(e).attr(t);if(Number(e)>Date.now())return 1}}function s(e){$(e).attr(t,Date.now()+2e3)}function n(e){$(e).removeAttr(t)}const o=new ClipboardJS(e,{target(e){let t=e.parentNode.nextElementSibling;return t.querySelector("code .rouge-code")}});$(e).tooltip({trigger:"hover",placement:"left"});const a=function(e){let t=$(e).children();return t.attr("class")}(e);o.on("success",e=>{e.clearSelection();const t=e.trigger;var o;l(t)||(function(e){let t=$(e),o=t.children();o.attr("class","fas 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\ No newline at end of file
+$(function(){$(window).scroll(()=>{50<$(this).scrollTop()&&"none"===$("#sidebar-trigger").css("display")?$("#back-to-top").fadeIn():$("#back-to-top").fadeOut()}),$("#back-to-top").click(()=>($("body,html").animate({scrollTop:0},800),!1))}),$(function(){$(".mode-toggle").click(t=>{const e=$(t.target);let o=e.prop("tagName")==="button".toUpperCase()?e:e.parent();o.blur(),flipMode()})}),$(function(){const t=$("#sidebar-trigger"),e=$("#search-trigger"),o=$("#search-cancel"),a=$("#search-cleaner"),l=$("#main"),s=$("#topbar-title"),n=$("#search-wrapper"),r=$("#search-result-wrapper"),i=$("#search-results"),c=$("#search-input"),d=$("#search-hints"),u=function(){let t=0;return{block(){t=window.scrollY,$("html,body").scrollTop(0)},release(){$("html,body").scrollTop(t)},getOffset(){return 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a=(0<e.length?e:$("h1")).text().trim();($("#page-category").length||$("#page-tag").length)&&/\s/.test(a)&&(a=a.replace(/[0-9]/g,"").trim()),$(window).scroll(function(){return!($("#post-list").length||e.is(":hidden")||t.is(":hidden")||$("#sidebar.sidebar-expand").length)&&void(95<=$(this).scrollTop()?t.text()!==a&&t.text(a):t.text()!==o&&t.text(o))}),t.click(function(){$("body,html").animate({scrollTop:0},800)})}),$(function(){$("input[type=checkbox]").addClass("unloaded"),$("input[type=checkbox][checked]").before('<i class="fas fa-check-circle checked"></i>'),$("input[type=checkbox]:not([checked])").before('<i class="far fa-circle"></i>')}),$(function(){var t="#main > div.row:first-child > div:first-child";if(!($(t+" img").length<=0)){var e=document.querySelectorAll(t+" img[data-src]");const o=lozad(e);o.observe(),$(t+` p > img[data-src],${t} img[data-src].preview-img`).each(function(){let t=$(this).next();var e="EM"===t.prop("tagName")?t.text():"",o=$(this).attr("data-src");$(this).wrap(`<a href="${o}" title="${e}" class="popup"></a>`)}),$(".popup").magnificPopup({type:"image",closeOnContentClick:!0,showCloseBtn:!1,zoom:{enabled:!0,duration:300,easing:"ease-in-out"}}),$(t+" a").has("img").addClass("img-link")}}),$(function(){var t=".code-header>button";const e="timeout";function l(t){if($(t)[0].hasAttribute(e)){t=$(t).attr(e);if(Number(t)>Date.now())return 1}}function s(t){$(t).attr(e,Date.now()+2e3)}function n(t){$(t).removeAttr(e)}const o=new ClipboardJS(t,{target(t){let e=t.parentNode.nextElementSibling;return e.querySelector("code .rouge-code")}});$(t).tooltip({trigger:"hover",placement:"left"});const a=function(t){let e=$(t).children();return e.attr("class")}(t);o.on("success",t=>{t.clearSelection();const e=t.trigger;var o;l(e)||(function(t){let e=$(t),o=e.children();o.attr("class","fas 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\ No newline at end of file
diff --git a/assets/js/dist/post.min.js b/assets/js/dist/post.min.js
index 7886ae0..fd572de 100644
--- a/assets/js/dist/post.min.js
+++ b/assets/js/dist/post.min.js
@@ -3,4 +3,4 @@
  * © 2019 Cotes Chung
  * MIT Licensed
  */
-$(function(){$(window).scroll(()=>{50<$(this).scrollTop()&&"none"===$("#sidebar-trigger").css("display")?$("#back-to-top").fadeIn():$("#back-to-top").fadeOut()}),$("#back-to-top").click(()=>($("body,html").animate({scrollTop:0},800),!1))}),$(function(){$("#mode-toggle-wrapper").keyup(t=>{13===t.keyCode&&flipMode()})}),$(function(){const t=$("#sidebar-trigger"),e=$("#search-trigger"),o=$("#search-cancel"),a=$("#search-cleaner"),n=$("#main"),l=$("#topbar-title"),r=$("#search-wrapper"),s=$("#search-result-wrapper"),i=$("#search-results"),c=$("#search-input"),d=$("#search-hints"),u=function(){let t=0;return{block(){t=window.scrollY,$("html,body").scrollTop(0)},release(){$("html,body").scrollTop(t)},getOffset(){return t}}}(),p={on(){t.addClass("unloaded"),l.addClass("unloaded"),e.addClass("unloaded"),r.addClass("d-flex"),o.addClass("loaded")},off(){o.removeClass("loaded"),r.removeClass("d-flex"),t.removeClass("unloaded"),l.removeClass("unloaded"),e.removeClass("unloaded")}},h=function(){let t=!1;return{on(){t||(u.block(),s.removeClass("unloaded"),n.addClass("unloaded"),t=!0)},off(){t&&(i.empty(),d.hasClass("unloaded")&&d.removeClass("unloaded"),s.addClass("unloaded"),a.removeClass("visible"),n.removeClass("unloaded"),u.release(),c.val(""),t=!1)},isVisible(){return t}}}();function f(){return 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a").has("img").addClass("img-link")}}),$(function(){let o=$(".timeago").length,t=void 0;const n=$("meta[name=day-prompt]").attr("content"),l=$("meta[name=hour-prompt]").attr("content"),r=$("meta[name=minute-prompt]").attr("content"),s=$("meta[name=justnow-prompt]").attr("content");function e(){return $(".timeago").each(function(){var t,e;!1!==$(this)[0].hasAttribute("date")?(e=function(t,e){let o=new Date,a=new Date(t);return a.getFullYear()!==o.getFullYear()||a.getMonth()!==o.getMonth()?e:(t=Math.floor((o-a)/1e3),1<=(e=Math.floor(t/86400))?` ${e} `+n:1<=(e=Math.floor(t/3600))?` ${e} `+l:1<=(t=Math.floor(t/60))?` ${t} `+r:s)}($(this).attr("date"),t=$(this).text()))===t?$(this).removeAttr("date"):$(this).text(e):--o}),0===o&&void 0!==t&&clearInterval(t),o}0!==o&&0<e()&&(t=setInterval(e,6e4))}),$(function(){$("input[type=checkbox]").addClass("unloaded"),$("input[type=checkbox][checked]").before('<i class="fas fa-check-circle 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e=$(t.target);if(!n(e)){t=window.location.href;const o=$("<input>");$("body").append(o),o.val(t).select(),document.execCommand("copy"),o.remove();const a=e.attr("data-original-title");t=e.attr("title-succeed");e.attr("data-original-title",t).tooltip("show"),l(e),setTimeout(()=>{e.attr("data-original-title",a),r(e)},2e3)}})}),$(function(){const s=$("#topbar-title"),i=$("#topbar-wrapper").outerHeight(),c="scroll-focus";$("a[href*='#']").not("[href='#']").not("[href='#0']").click(function(n){if(this.pathname.replace(/^\//,"")===location.pathname.replace(/^\//,"")&&location.hostname===this.hostname){const r=decodeURI(this.hash);let e=RegExp(/^#fnref:/).test(r),o=!e&&RegExp(/^#fn:/).test(r);var l=r.includes(":")?r.replace(/\:/g,"\\:"):r;let a=$(l);l=$(this).parent().prop("tagName"),l=RegExp(/^H\d/).test(l);if(void 0!==a){n.preventDefault(),history.pushState&&history.pushState(null,null,r);n=l?$(this).offset().top:$(window).scrollTop();let t=a.offset().top;t<n?(e&&(t-=i+8),l&&s.is(":hidden")&&(t+=i)):l||o||(t+=i),$("html,body").animate({scrollTop:t},800,()=>(a.focus(),$(`[${c}=true]`).length&&$(`[${c}=true]`).attr(c,!1),$(":target").length&&$(":target").attr(c,!1),(o||e)&&a.attr(c,!0),a.is(":focus")?!1:(a.attr("tabindex","-1"),void a.focus())))}}})});
\ No newline at end of file
+$(function(){$(window).scroll(()=>{50<$(this).scrollTop()&&"none"===$("#sidebar-trigger").css("display")?$("#back-to-top").fadeIn():$("#back-to-top").fadeOut()}),$("#back-to-top").click(()=>($("body,html").animate({scrollTop:0},800),!1))}),$(function(){$(".mode-toggle").click(t=>{const e=$(t.target);let o=e.prop("tagName")==="button".toUpperCase()?e:e.parent();o.blur(),flipMode()})}),$(function(){const t=$("#sidebar-trigger"),e=$("#search-trigger"),o=$("#search-cancel"),a=$("#search-cleaner"),n=$("#main"),l=$("#topbar-title"),r=$("#search-wrapper"),s=$("#search-result-wrapper"),i=$("#search-results"),c=$("#search-input"),d=$("#search-hints"),u=function(){let t=0;return{block(){t=window.scrollY,$("html,body").scrollTop(0)},release(){$("html,body").scrollTop(t)},getOffset(){return t}}}(),p={on(){t.addClass("unloaded"),l.addClass("unloaded"),e.addClass("unloaded"),r.addClass("d-flex"),o.addClass("loaded")},off(){o.removeClass("loaded"),r.removeClass("d-flex"),t.removeClass("unloaded"),l.removeClass("unloaded"),e.removeClass("unloaded")}},h=function(){let t=!1;return{on(){t||(u.block(),s.removeClass("unloaded"),n.addClass("unloaded"),t=!0)},off(){t&&(i.empty(),d.hasClass("unloaded")&&d.removeClass("unloaded"),s.addClass("unloaded"),a.removeClass("visible"),n.removeClass("unloaded"),u.release(),c.val(""),t=!1)},isVisible(){return t}}}();function f(){return o.hasClass("loaded")}e.click(function(){p.on(),h.on(),c.focus()}),o.click(function(){p.off(),h.off()}),c.focus(function(){r.addClass("input-focus")}),c.focusout(function(){r.removeClass("input-focus")}),c.on("keyup",function(t){8===t.keyCode&&""===c.val()?f()?d.removeClass("unloaded"):h.off():""!==c.val()&&(h.on(),a.hasClass("visible")||a.addClass("visible"),f()&&d.addClass("unloaded"))}),a.on("click",function(){c.val(""),f()?(d.removeClass("unloaded"),i.empty()):h.off(),c.focus(),a.removeClass("visible")})}),$(function(){var t=function(){const t="sidebar-display";let e=!1;const o=$("body");return{toggle(){!1===e?o.attr(t,""):o.removeAttr(t),e=!e}}}();$("#sidebar-trigger").click(t.toggle),$("#mask").click(t.toggle)}),$(function(){$('[data-toggle="tooltip"]').tooltip()}),$(function(){const e=$("#topbar-wrapper"),o=$("#toc-wrapper"),a=$(".access"),n=$("#search-input");let l,r=0;const s=e.outerHeight();$(window).scroll(function(t){$("#topbar-title").is(":hidden")&&(l=!0)}),setInterval(function(){l&&(function(){var t=$(this).scrollTop();Math.abs(r-t)<=5||(t>r&&t>s?(e.removeClass("topbar-down").addClass("topbar-up"),0<o.length&&o.removeClass("topbar-down"),0<a.length&&a.removeClass("topbar-down"),n.is(":focus")&&n.blur()):t+$(window).height()<$(document).height()&&(e.removeClass("topbar-up").addClass("topbar-down"),0<o.length&&o.addClass("topbar-down"),0<a.length&&a.addClass("topbar-down")),r=t)}(),l=!1)},250)}),$(function(){const t=$("#topbar-title"),e=$("div.post>h1"),o=t.text().trim();let a=(0<e.length?e:$("h1")).text().trim();($("#page-category").length||$("#page-tag").length)&&/\s/.test(a)&&(a=a.replace(/[0-9]/g,"").trim()),$(window).scroll(function(){return!($("#post-list").length||e.is(":hidden")||t.is(":hidden")||$("#sidebar.sidebar-expand").length)&&void(95<=$(this).scrollTop()?t.text()!==a&&t.text(a):t.text()!==o&&t.text(o))}),t.click(function(){$("body,html").animate({scrollTop:0},800)})}),$(function(){var t="#main > div.row:first-child > div:first-child";if(!($(t+" img").length<=0)){var e=document.querySelectorAll(t+" img[data-src]");const o=lozad(e);o.observe(),$(t+` p > img[data-src],${t} img[data-src].preview-img`).each(function(){let t=$(this).next();var e="EM"===t.prop("tagName")?t.text():"",o=$(this).attr("data-src");$(this).wrap(`<a href="${o}" title="${e}" class="popup"></a>`)}),$(".popup").magnificPopup({type:"image",closeOnContentClick:!0,showCloseBtn:!1,zoom:{enabled:!0,duration:300,easing:"ease-in-out"}}),$(t+" a").has("img").addClass("img-link")}}),$(function(){let o=$(".timeago").length,t=void 0;const n=$("meta[name=day-prompt]").attr("content"),l=$("meta[name=hour-prompt]").attr("content"),r=$("meta[name=minute-prompt]").attr("content"),s=$("meta[name=justnow-prompt]").attr("content");function e(){return $(".timeago").each(function(){var t,e;!1!==$(this)[0].hasAttribute("date")?(e=function(t,e){let o=new Date,a=new Date(t);return a.getFullYear()!==o.getFullYear()||a.getMonth()!==o.getMonth()?e:(t=Math.floor((o-a)/1e3),1<=(e=Math.floor(t/86400))?` ${e} `+n:1<=(e=Math.floor(t/3600))?` ${e} `+l:1<=(t=Math.floor(t/60))?` ${t} `+r:s)}($(this).attr("date"),t=$(this).text()))===t?$(this).removeAttr("date"):$(this).text(e):--o}),0===o&&void 0!==t&&clearInterval(t),o}0!==o&&0<e()&&(t=setInterval(e,6e4))}),$(function(){$("input[type=checkbox]").addClass("unloaded"),$("input[type=checkbox][checked]").before('<i class="fas fa-check-circle checked"></i>'),$("input[type=checkbox]:not([checked])").before('<i class="far fa-circle"></i>')}),$(function(){var t=".code-header>button";const e="timeout";function n(t){if($(t)[0].hasAttribute(e)){t=$(t).attr(e);if(Number(t)>Date.now())return 1}}function l(t){$(t).attr(e,Date.now()+2e3)}function r(t){$(t).removeAttr(e)}const o=new ClipboardJS(t,{target(t){let e=t.parentNode.nextElementSibling;return e.querySelector("code .rouge-code")}});$(t).tooltip({trigger:"hover",placement:"left"});const a=function(t){let e=$(t).children();return e.attr("class")}(t);o.on("success",t=>{t.clearSelection();const e=t.trigger;var o;n(e)||(function(t){let e=$(t),o=e.children();o.attr("class","fas fa-check")}(e),o=e,t=$(o).attr("title-succeed"),$(o).attr("data-original-title",t).tooltip("show"),l(e),setTimeout(()=>{var t;t=e,$(t).tooltip("hide").removeAttr("data-original-title"),function(t){let e=$(t),o=e.children();o.attr("class",a)}(e),r(e)},2e3))}),$("#copy-link").click(t=>{let e=$(t.target);if(!n(e)){t=window.location.href;const o=$("<input>");$("body").append(o),o.val(t).select(),document.execCommand("copy"),o.remove();const a=e.attr("data-original-title");t=e.attr("title-succeed");e.attr("data-original-title",t).tooltip("show"),l(e),setTimeout(()=>{e.attr("data-original-title",a),r(e)},2e3)}})}),$(function(){const s=$("#topbar-title"),i=$("#topbar-wrapper").outerHeight(),c="scroll-focus";$("a[href*='#']").not("[href='#']").not("[href='#0']").click(function(n){if(this.pathname.replace(/^\//,"")===location.pathname.replace(/^\//,"")&&location.hostname===this.hostname){const r=decodeURI(this.hash);let e=RegExp(/^#fnref:/).test(r),o=!e&&RegExp(/^#fn:/).test(r);var l=r.includes(":")?r.replace(/\:/g,"\\:"):r;let a=$(l);l=$(this).parent().prop("tagName"),l=RegExp(/^H\d/).test(l);if(void 0!==a){n.preventDefault(),history.pushState&&history.pushState(null,null,r);n=l?$(this).offset().top:$(window).scrollTop();let t=a.offset().top;t<n?(e&&(t-=i+8),l&&s.is(":hidden")&&(t+=i)):l||o||(t+=i),$("html,body").animate({scrollTop:t},800,()=>(a.focus(),$(`[${c}=true]`).length&&$(`[${c}=true]`).attr(c,!1),$(":target").length&&$(":target").attr(c,!1),(o||e)&&a.attr(c,!0),a.is(":focus")?!1:(a.attr("tabindex","-1"),void a.focus())))}}})});
\ No newline at end of file

From cf6c8e9b3aa4002a09432911fc9b7c51a573df9a Mon Sep 17 00:00:00 2001
From: Cotes Chung <11371340+cotes2020@users.noreply.github.com>
Date: Tue, 7 Dec 2021 20:08:53 +0800
Subject: [PATCH 2/2] Improve accessibility of panel heading elements

---
 _includes/toc.html           |  4 +---
 _includes/trending-tags.html |  2 +-
 _includes/update-list.html   |  2 +-
 _sass/addon/commons.scss     |  6 ++----
 _sass/addon/module.scss      | 12 ------------
 _sass/layout/post.scss       |  3 ---
 6 files changed, 5 insertions(+), 24 deletions(-)

diff --git a/_includes/toc.html b/_includes/toc.html
index 0ddebdb..b9cea39 100644
--- a/_includes/toc.html
+++ b/_includes/toc.html
@@ -10,9 +10,7 @@
 <script src="https://cdn.jsdelivr.net/gh/afeld/bootstrap-toc@1.0.1/dist/bootstrap-toc.min.js"></script>
 
 <div id="toc-wrapper" class="pl-0 pr-4 mb-5">
-  <h4 class="pl-3 pt-2 mb-2">
-    {{- site.data.locales[lang].panel.toc -}}
-  </h4>
+  <div class="panel-heading pl-3 pt-2 mb-2">{{- site.data.locales[lang].panel.toc -}}</div>
   <nav id="toc" data-toggle="toc"></nav>
 </div>
 {% endif %}
diff --git a/_includes/trending-tags.html b/_includes/trending-tags.html
index a5ff0c0..eb645cd 100644
--- a/_includes/trending-tags.html
+++ b/_includes/trending-tags.html
@@ -37,7 +37,7 @@
 
 {% if trending_tags.size > 0 %}
   <div id="access-tags">
-    <h4 class="text-muted">{{- site.data.locales[lang].panel.trending_tags -}}</h4>
+    <div class="panel-heading">{{- site.data.locales[lang].panel.trending_tags -}}</div>
     <div class="d-flex flex-wrap mt-3 mb-1 mr-3">
 
     {% for tag_name in trending_tags %}
diff --git a/_includes/update-list.html b/_includes/update-list.html
index 4f4201b..e8ec23c 100644
--- a/_includes/update-list.html
+++ b/_includes/update-list.html
@@ -26,7 +26,7 @@
 {% if update_list.size > 0 %}
 
   <div id="access-lastmod" class="post">
-    <h4>{{- site.data.locales[lang].panel.lastmod -}}</h4>
+    <div class="panel-heading">{{- site.data.locales[lang].panel.lastmod -}}</div>
     <ul class="post-content pl-0 pb-1 ml-1 mt-2">
       {% for item in update_list %}
         {% assign index = item | split: "::" | last | plus: 0 %}
diff --git a/_sass/addon/commons.scss b/_sass/addon/commons.scss
index faae717..0729239 100644
--- a/_sass/addon/commons.scss
+++ b/_sass/addon/commons.scss
@@ -216,10 +216,8 @@ img[data-src] {
 }
 
 #panel-wrapper {
-  h4 {
-    @include panel-label;
-
-    font-family: inherit;
+  .panel-heading { // the headings
+    @include label(inherit);
   }
 
   .post-tag {
diff --git a/_sass/addon/module.scss b/_sass/addon/module.scss
index 45d57bc..7e25531 100644
--- a/_sass/addon/module.scss
+++ b/_sass/addon/module.scss
@@ -124,18 +124,6 @@
   font-weight: $font-weight;
 }
 
-@mixin panel-label {
-  @include label(inherit);
-
-  display: block;
-  line-height: 1.2;
-  padding-top: 0.5rem;
-  padding-bottom: 0.5rem;
-  margin-top: 0;
-  margin-bottom: 0;
-  letter-spacing: -0.02em;
-}
-
 @mixin align-center {
   position: relative;
   left: 50%;
diff --git a/_sass/layout/post.scss b/_sass/layout/post.scss
index bcb811f..4d09f23 100644
--- a/_sass/layout/post.scss
+++ b/_sass/layout/post.scss
@@ -150,9 +150,6 @@ img.preview-img {
     top: 6rem;
   }
 
-  > span {
-    @include panel-label;
-  }
 }
 
 #toc li a {