diff --git a/layouts/partials/head.html b/layouts/partials/head.html
index d721a57..ed233bf 100644
--- a/layouts/partials/head.html
+++ b/layouts/partials/head.html
@@ -62,7 +62,7 @@
 {{- end }}
 
 <!-- Styles -->
-<link href="{{ "dist/even.min.css?v=2.7.1" | relURL }}" rel="stylesheet">
+<link href="{{ "dist/even.min.css?v=2.7.2" | relURL }}" rel="stylesheet">
 {{ if .Site.Params.bootcdn -}}
   {{ if .Site.Params.fancybox }}<link href="https://cdn.bootcss.com/fancybox/3.1.20/jquery.fancybox.min.css" rel="stylesheet" crossorigin="anonymous">{{ end }}
 {{- else if .Site.Params.publicCDN.enable -}}
diff --git a/layouts/partials/scripts.html b/layouts/partials/scripts.html
index 83ad1ac..1a284ee 100644
--- a/layouts/partials/scripts.html
+++ b/layouts/partials/scripts.html
@@ -13,7 +13,7 @@
   <script type="text/javascript" src="{{ "lib/slideout/slideout-1.0.1.min.js" | relURL }}"></script>
   {{ if .Site.Params.fancybox }}<script type="text/javascript" src="{{ "lib/fancybox/jquery.fancybox-3.1.20.min.js" | relURL }}"></script>{{ end }}
 {{- end }}
-<script type="text/javascript" src="{{ "dist/even.min.js?v=2.7.1" | relURL }}"></script>
+<script type="text/javascript" src="{{ "dist/even.min.js?v=2.7.2" | relURL }}"></script>
 
 {{- if and (or .Params.mathjax (and .Site.Params.mathjax (ne .Params.mathjax false))) (or .IsPage .IsHome) }}
   <script type="text/javascript">
diff --git a/src/js/even.js b/src/js/even.js
index 33ca2f3..0d5813a 100644
--- a/src/js/even.js
+++ b/src/js/even.js
@@ -183,6 +183,7 @@ Even.toc = function () {
 }
 
 Even._refactorToc = function (toc) {
+  // when headings do not start with `h1`
   const oldTocList = toc.children[0]
   let newTocList = oldTocList
   let temp
@@ -192,14 +193,14 @@ Even._refactorToc = function (toc) {
 }
 
 Even._linkToc = function () {
-  const links = document.querySelectorAll('#TableOfContents a')
+  const links = document.querySelectorAll('#TableOfContents a:first-child')
   for (let i = 0; i < links.length; i++) links[i].className += ' toc-link'
 
   for (let num = 1; num <= 6; num++) {
     const headers = document.querySelectorAll('.post-content>h' + num)
     for (let i = 0; i < headers.length; i++) {
       const header = headers[i]
-      header.innerHTML = `<a href="#${header.id}" class="headerlink" title="${header.innerHTML}"></a>${header.innerHTML}`
+      header.innerHTML = `<a href="#${header.id}" class="headerlink"></a>${header.innerHTML}`
     }
   }
 }
diff --git a/src/package.json b/src/package.json
index dcae54f..ffc23a8 100644
--- a/src/package.json
+++ b/src/package.json
@@ -1,6 +1,6 @@
 {
   "name": "even-src",
-  "version": "2.7.1",
+  "version": "2.7.2",
   "description": "even source file",
   "main": "index.js",
   "scripts": {
diff --git a/static/dist/even.min.js b/static/dist/even.min.js
index b6f5daf..a3795bf 100644
--- a/static/dist/even.min.js
+++ b/static/dist/even.min.js
@@ -1,2 +1,2 @@
-!function(e){var n={};function t(o){if(n[o])return n[o].exports;var r=n[o]={i:o,l:!1,exports:{}};return e[o].call(r.exports,r,r.exports,t),r.l=!0,r.exports}t.m=e,t.c=n,t.d=function(e,n,o){t.o(e,n)||Object.defineProperty(e,n,{configurable:!1,enumerable:!0,get:o})},t.n=function(e){var n=e&&e.__esModule?function(){return e.default}:function(){return e};return t.d(n,"a",n),n},t.o=function(e,n){return Object.prototype.hasOwnProperty.call(e,n)},t.p="",t(t.s=0)}([function(e,n,t){"use strict";var o=t(1);t(2),$(document).ready(function(){o.Even.backToTop(),o.Even.mobileNavbar(),o.Even.toc(),o.Even.fancybox()}),hljs.initHighlighting(),o.Even.highlight()},function(e,n,t){"use strict";Object.defineProperty(n,"__esModule",{value:!0});var o={};o.backToTop=function(){var e=$("#back-to-top");$(window).scroll(function(){$(window).scrollTop()>100?e.fadeIn(1e3):e.fadeOut(1e3)}),e.click(function(){$("body,html").animate({scrollTop:0})})},o.mobileNavbar=function(){var e=$("#mobile-navbar"),n=$(".mobile-navbar-icon"),t=new Slideout({panel:document.getElementById("mobile-panel"),menu:document.getElementById("mobile-menu"),padding:180,tolerance:70});t.disableTouch(),n.click(function(){t.toggle()}),t.on("beforeopen",function(){e.addClass("fixed-open"),n.addClass("icon-click").removeClass("icon-out")}),t.on("beforeclose",function(){e.removeClass("fixed-open"),n.addClass("icon-out").removeClass("icon-click")}),$("#mobile-panel").on("touchend",function(){t.isOpen()&&n.click()})},o._initToc=function(){var e=$(".post-toc"),n=$(".post-footer");if(e.length){var t=e.offset().top-20,o=n.offset().top-e.height()-20,r={start:{position:"absolute",top:t},process:{position:"fixed",top:20},end:{position:"absolute",top:o}};$(window).scroll(function(){var n=$(window).scrollTop();n<t?e.css(r.start):n>o?e.css(r.end):e.css(r.process)})}var c=$(".toc-link"),i=$(".headerlink"),a=$(".post-toc-content li"),l=$.map(i,function(e){return $(e).offset().top}),s=$.map(l,function(e){return e-30});$(window).scroll(function(){var e=$(window).scrollTop(),n=function(e,n){for(var t=0;t<e.length-1;t++)if(n>e[t]&&n<=e[t+1])return t;return n>e[e.length-1]?e.length-1:-1}(s,e);if($(c).removeClass("active"),$(a).removeClass("has-active"),-1!==n){$(c[n]).addClass("active");for(var t=c[n].parentNode;"NAV"!==t.tagName;)$(t).addClass("has-active"),t=t.parentNode.parentNode}})},o.fancybox=function(){$.fancybox&&($(".post-content").each(function(){$(this).find("img").each(function(){$(this).wrap('<a class="fancybox" href="'+this.src+'" data-fancybox="gallery" data-caption="'+this.title+'"></a>')})}),$(".fancybox").fancybox({selector:".fancybox",protect:!0}))},o.highlight=function(){for(var e=document.querySelectorAll("pre code"),n=0;n<e.length;n++){var t=e[n],o=t.parentElement,r=t.innerHTML.split(/\n/);""===r[r.length-1]&&r.pop();for(var c=r.length,i="",a=0;a<c;a++)i+='<div class="line">'+(a+1)+"</div>";for(var l="",s=0;s<c;s++)l+='<div class="line">'+r[s]+"</div>";t.className+=" highlight";var d=document.createElement("figure");d.className=t.className,d.innerHTML='<table><tbody><tr><td class="gutter"><pre>'+i+'</pre></td><td class="code"><pre>'+l+"</pre></td></tr></tbody></table>",o.parentElement.replaceChild(d,o)}},o.toc=function(){var e=document.getElementById("post-toc");if(null!==e){var n=document.getElementById("TableOfContents");null===n?e.parentNode.removeChild(e):(this._refactorToc(n),this._linkToc(),this._initToc())}},o._refactorToc=function(e){for(var n=e.children[0],t=n,o=void 0;1===t.children.length&&"UL"===(o=t.children[0].children[0]).tagName;)t=o;t!==n&&e.replaceChild(t,n)},o._linkToc=function(){for(var e=document.querySelectorAll("#TableOfContents a"),n=0;n<e.length;n++)e[n].className+=" toc-link";for(var t=1;t<=6;t++)for(var o=document.querySelectorAll(".post-content>h"+t),r=0;r<o.length;r++){var c=o[r];c.innerHTML='<a href="#'+c.id+'" class="headerlink" title="'+c.innerHTML+'"></a>'+c.innerHTML}},n.Even=o},function(e,n){}]);
+!function(e){var n={};function t(o){if(n[o])return n[o].exports;var c=n[o]={i:o,l:!1,exports:{}};return e[o].call(c.exports,c,c.exports,t),c.l=!0,c.exports}t.m=e,t.c=n,t.d=function(e,n,o){t.o(e,n)||Object.defineProperty(e,n,{configurable:!1,enumerable:!0,get:o})},t.n=function(e){var n=e&&e.__esModule?function(){return e.default}:function(){return e};return t.d(n,"a",n),n},t.o=function(e,n){return Object.prototype.hasOwnProperty.call(e,n)},t.p="",t(t.s=0)}([function(e,n,t){"use strict";var o=t(1);t(2),$(document).ready(function(){o.Even.backToTop(),o.Even.mobileNavbar(),o.Even.toc(),o.Even.fancybox()}),hljs.initHighlighting(),o.Even.highlight()},function(e,n,t){"use strict";Object.defineProperty(n,"__esModule",{value:!0});var o={};o.backToTop=function(){var e=$("#back-to-top");$(window).scroll(function(){$(window).scrollTop()>100?e.fadeIn(1e3):e.fadeOut(1e3)}),e.click(function(){$("body,html").animate({scrollTop:0})})},o.mobileNavbar=function(){var e=$("#mobile-navbar"),n=$(".mobile-navbar-icon"),t=new Slideout({panel:document.getElementById("mobile-panel"),menu:document.getElementById("mobile-menu"),padding:180,tolerance:70});t.disableTouch(),n.click(function(){t.toggle()}),t.on("beforeopen",function(){e.addClass("fixed-open"),n.addClass("icon-click").removeClass("icon-out")}),t.on("beforeclose",function(){e.removeClass("fixed-open"),n.addClass("icon-out").removeClass("icon-click")}),$("#mobile-panel").on("touchend",function(){t.isOpen()&&n.click()})},o._initToc=function(){var e=$(".post-toc"),n=$(".post-footer");if(e.length){var t=e.offset().top-20,o=n.offset().top-e.height()-20,c={start:{position:"absolute",top:t},process:{position:"fixed",top:20},end:{position:"absolute",top:o}};$(window).scroll(function(){var n=$(window).scrollTop();n<t?e.css(c.start):n>o?e.css(c.end):e.css(c.process)})}var r=$(".toc-link"),i=$(".headerlink"),a=$(".post-toc-content li"),l=$.map(i,function(e){return $(e).offset().top}),s=$.map(l,function(e){return e-30});$(window).scroll(function(){var e=$(window).scrollTop(),n=function(e,n){for(var t=0;t<e.length-1;t++)if(n>e[t]&&n<=e[t+1])return t;return n>e[e.length-1]?e.length-1:-1}(s,e);if($(r).removeClass("active"),$(a).removeClass("has-active"),-1!==n){$(r[n]).addClass("active");for(var t=r[n].parentNode;"NAV"!==t.tagName;)$(t).addClass("has-active"),t=t.parentNode.parentNode}})},o.fancybox=function(){$.fancybox&&($(".post-content").each(function(){$(this).find("img").each(function(){$(this).wrap('<a class="fancybox" href="'+this.src+'" data-fancybox="gallery" data-caption="'+this.title+'"></a>')})}),$(".fancybox").fancybox({selector:".fancybox",protect:!0}))},o.highlight=function(){for(var e=document.querySelectorAll("pre code"),n=0;n<e.length;n++){var t=e[n],o=t.parentElement,c=t.innerHTML.split(/\n/);""===c[c.length-1]&&c.pop();for(var r=c.length,i="",a=0;a<r;a++)i+='<div class="line">'+(a+1)+"</div>";for(var l="",s=0;s<r;s++)l+='<div class="line">'+c[s]+"</div>";t.className+=" highlight";var d=document.createElement("figure");d.className=t.className,d.innerHTML='<table><tbody><tr><td class="gutter"><pre>'+i+'</pre></td><td class="code"><pre>'+l+"</pre></td></tr></tbody></table>",o.parentElement.replaceChild(d,o)}},o.toc=function(){var e=document.getElementById("post-toc");if(null!==e){var n=document.getElementById("TableOfContents");null===n?e.parentNode.removeChild(e):(this._refactorToc(n),this._linkToc(),this._initToc())}},o._refactorToc=function(e){for(var n=e.children[0],t=n,o=void 0;1===t.children.length&&"UL"===(o=t.children[0].children[0]).tagName;)t=o;t!==n&&e.replaceChild(t,n)},o._linkToc=function(){for(var e=document.querySelectorAll("#TableOfContents a:first-child"),n=0;n<e.length;n++)e[n].className+=" toc-link";for(var t=1;t<=6;t++)for(var o=document.querySelectorAll(".post-content>h"+t),c=0;c<o.length;c++){var r=o[c];r.innerHTML='<a href="#'+r.id+'" class="headerlink"></a>'+r.innerHTML}},n.Even=o},function(e,n){}]);
 //# sourceMappingURL=even.min.js.map
\ No newline at end of file
diff --git a/static/dist/even.min.js.map b/static/dist/even.min.js.map
index be3f9cd..2d49471 100644
--- a/static/dist/even.min.js.map
+++ b/static/dist/even.min.js.map
@@ -1 +1 @@
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\t\tif(!__webpack_require__.o(exports, name)) {\n \t\t\tObject.defineProperty(exports, name, {\n \t\t\t\tconfigurable: false,\n \t\t\t\tenumerable: true,\n \t\t\t\tget: getter\n \t\t\t});\n \t\t}\n \t};\n\n \t// getDefaultExport function for compatibility with non-harmony modules\n \t__webpack_require__.n = function(module) {\n \t\tvar getter = module && module.__esModule ?\n \t\t\tfunction getDefault() { return module['default']; } :\n \t\t\tfunction getModuleExports() { return module; };\n \t\t__webpack_require__.d(getter, 'a', getter);\n \t\treturn getter;\n \t};\n\n \t// Object.prototype.hasOwnProperty.call\n \t__webpack_require__.o = function(object, property) { return Object.prototype.hasOwnProperty.call(object, property); };\n\n \t// __webpack_public_path__\n \t__webpack_require__.p = \"\";\n\n \t// Load entry module and return exports\n \treturn __webpack_require__(__webpack_require__.s = 0);\n\n\n\n// WEBPACK FOOTER //\n// webpack/bootstrap 40610dccf0446872bd93","import {Even} from './even.js'\r\n\r\nimport '../css/style.scss'\r\n\r\n$(document).ready(function () {\r\n  Even.backToTop()\r\n  Even.mobileNavbar()\r\n  Even.toc()\r\n  Even.fancybox()\r\n})\r\n\r\nhljs.initHighlighting()\r\nEven.highlight()\r\n\n\n\n// WEBPACK FOOTER //\n// ./js/main.js","'use strict'\r\n\r\nconst Even = {}\r\n\r\nEven.backToTop = function () {\r\n  const $backToTop = $('#back-to-top')\r\n\r\n  $(window).scroll(function () {\r\n    if ($(window).scrollTop() > 100) {\r\n      $backToTop.fadeIn(1000)\r\n    } else {\r\n      $backToTop.fadeOut(1000)\r\n    }\r\n  })\r\n\r\n  $backToTop.click(function () {\r\n    $('body,html').animate({ scrollTop: 0 })\r\n  })\r\n}\r\n\r\nEven.mobileNavbar = function () {\r\n  const $mobileNav = $('#mobile-navbar')\r\n  const $mobileNavIcon = $('.mobile-navbar-icon')\r\n  const slideout = new Slideout({\r\n    'panel': document.getElementById('mobile-panel'),\r\n    'menu': document.getElementById('mobile-menu'),\r\n    'padding': 180,\r\n    'tolerance': 70\r\n  })\r\n  slideout.disableTouch()\r\n\r\n  $mobileNavIcon.click(function () {\r\n    slideout.toggle()\r\n  })\r\n\r\n  slideout.on('beforeopen', function () {\r\n    $mobileNav.addClass('fixed-open')\r\n    $mobileNavIcon.addClass('icon-click').removeClass('icon-out')\r\n  })\r\n\r\n  slideout.on('beforeclose', function () {\r\n    $mobileNav.removeClass('fixed-open')\r\n    $mobileNavIcon.addClass('icon-out').removeClass('icon-click')\r\n  })\r\n\r\n  $('#mobile-panel').on('touchend', function () {\r\n    slideout.isOpen() && $mobileNavIcon.click()\r\n  })\r\n}\r\n\r\nEven._initToc = function () {\r\n  const SPACING = 20\r\n  const $toc = $('.post-toc')\r\n  const $footer = $('.post-footer')\r\n\r\n  if ($toc.length) {\r\n    const minScrollTop = $toc.offset().top - SPACING\r\n    const maxScrollTop = $footer.offset().top - $toc.height() - SPACING\r\n\r\n    const tocState = {\r\n      start: {\r\n        'position': 'absolute',\r\n        'top': minScrollTop\r\n      },\r\n      process: {\r\n        'position': 'fixed',\r\n        'top': SPACING\r\n      },\r\n      end: {\r\n        'position': 'absolute',\r\n        'top': maxScrollTop\r\n      }\r\n    }\r\n\r\n    $(window).scroll(function () {\r\n      const scrollTop = $(window).scrollTop()\r\n\r\n      if (scrollTop < minScrollTop) {\r\n        $toc.css(tocState.start)\r\n      } else if (scrollTop > maxScrollTop) {\r\n        $toc.css(tocState.end)\r\n      } else {\r\n        $toc.css(tocState.process)\r\n      }\r\n    })\r\n  }\r\n\r\n  const HEADERFIX = 30\r\n  const $toclink = $('.toc-link')\r\n  const $headerlink = $('.headerlink')\r\n  const $tocLinkLis = $('.post-toc-content li')\r\n\r\n  const headerlinkTop = $.map($headerlink, function (link) {\r\n    return $(link).offset().top\r\n  })\r\n\r\n  const headerLinksOffsetForSearch = $.map(headerlinkTop, function (offset) {\r\n    return offset - HEADERFIX\r\n  })\r\n\r\n  const searchActiveTocIndex = function (array, target) {\r\n    for (let i = 0; i < array.length - 1; i++) {\r\n      if (target > array[i] && target <= array[i + 1]) return i\r\n    }\r\n    if (target > array[array.length - 1]) return array.length - 1\r\n    return -1\r\n  }\r\n\r\n  $(window).scroll(function () {\r\n    const scrollTop = $(window).scrollTop()\r\n    const activeTocIndex = searchActiveTocIndex(headerLinksOffsetForSearch, scrollTop)\r\n\r\n    $($toclink).removeClass('active')\r\n    $($tocLinkLis).removeClass('has-active')\r\n\r\n    if (activeTocIndex !== -1) {\r\n      $($toclink[activeTocIndex]).addClass('active')\r\n      let ancestor = $toclink[activeTocIndex].parentNode\r\n      while (ancestor.tagName !== 'NAV') {\r\n        $(ancestor).addClass('has-active')\r\n        ancestor = ancestor.parentNode.parentNode\r\n      }\r\n    }\r\n  })\r\n}\r\n\r\nEven.fancybox = function () {\r\n  if ($.fancybox) {\r\n    $('.post-content').each(function () {\r\n      $(this).find('img').each(function () {\r\n        $(this).wrap(`<a class=\"fancybox\" href=\"${this.src}\" data-fancybox=\"gallery\" data-caption=\"${this.title}\"></a>`)\r\n      })\r\n    })\r\n\r\n    $('.fancybox').fancybox({\r\n      selector: '.fancybox',\r\n      protect: true\r\n    })\r\n  }\r\n}\r\n\r\nEven.highlight = function () {\r\n  const blocks = document.querySelectorAll('pre code')\r\n  for (let i = 0; i < blocks.length; i++) {\r\n    const block = blocks[i]\r\n    const rootElement = block.parentElement\r\n    const lineCodes = block.innerHTML.split(/\\n/)\r\n    if (lineCodes[lineCodes.length - 1] === '') lineCodes.pop()\r\n    const lineLength = lineCodes.length\r\n\r\n    let codeLineHtml = ''\r\n    for (let i = 0; i < lineLength; i++) {\r\n      codeLineHtml += `<div class=\"line\">${i + 1}</div>`\r\n    }\r\n\r\n    let codeHtml = ''\r\n    for (let i = 0; i < lineLength; i++) {\r\n      codeHtml += `<div class=\"line\">${lineCodes[i]}</div>`\r\n    }\r\n\r\n    block.className += ' highlight'\r\n    const figure = document.createElement('figure')\r\n    figure.className = block.className\r\n    figure.innerHTML = `<table><tbody><tr><td class=\"gutter\"><pre>${codeLineHtml}</pre></td><td class=\"code\"><pre>${codeHtml}</pre></td></tr></tbody></table>`\r\n\r\n    rootElement.parentElement.replaceChild(figure, rootElement)\r\n  }\r\n}\r\n\r\nEven.toc = function () {\r\n  const tocContainer = document.getElementById('post-toc')\r\n  if (tocContainer !== null) {\r\n    const toc = document.getElementById('TableOfContents')\r\n    if (toc === null) {\r\n      // toc = true, but there are no headings\r\n      tocContainer.parentNode.removeChild(tocContainer)\r\n    } else {\r\n      this._refactorToc(toc)\r\n      this._linkToc()\r\n      this._initToc()\r\n    }\r\n  }\r\n}\r\n\r\nEven._refactorToc = function (toc) {\r\n  // when headings do not start with `h1`\r\n  const oldTocList = toc.children[0]\r\n  let newTocList = oldTocList\r\n  let temp\r\n  while (newTocList.children.length === 1 && (temp = newTocList.children[0].children[0]).tagName === 'UL') newTocList = temp\r\n\r\n  if (newTocList !== oldTocList) toc.replaceChild(newTocList, oldTocList)\r\n}\r\n\r\nEven._linkToc = function () {\r\n  const links = document.querySelectorAll('#TableOfContents a:first-child')\r\n  for (let i = 0; i < links.length; i++) links[i].className += ' toc-link'\r\n\r\n  for (let num = 1; num <= 6; num++) {\r\n    const headers = document.querySelectorAll('.post-content>h' + num)\r\n    for (let i = 0; i < headers.length; i++) {\r\n      const header = headers[i]\r\n      header.innerHTML = `<a href=\"#${header.id}\" class=\"headerlink\"></a>${header.innerHTML}`\r\n    }\r\n  }\r\n}\r\n\r\nexport {Even}\r\n\n\n\n// WEBPACK FOOTER //\n// ./js/even.js"],"sourceRoot":""}
\ No newline at end of file