From dacef431f48befed3198571f76d5c9dfbf745ec1 Mon Sep 17 00:00:00 2001
From: Reed von Redwitz <reed+github@vonredwitz.com>
Date: Mon, 22 Jan 2024 12:22:24 +0100
Subject: [PATCH] fix: add better tests, stop aggressively sanitizing, and add
 styles

---
 mod.ts                      | 20 ++++++++-
 style.js                    |  2 +-
 style/main.scss             | 19 +++++++++
 test/fixtures/footnote.html | 35 +++++++++++-----
 test/fixtures/footnote.md   | 21 +++++++++-
 test/server_test.ts         | 84 ++++++++++++++++++++++++++++++++++++-
 test/test_utils.ts          |  2 -
 7 files changed, 165 insertions(+), 18 deletions(-)

diff --git a/mod.ts b/mod.ts
index b7f852c..e1e471a 100644
--- a/mod.ts
+++ b/mod.ts
@@ -238,6 +238,8 @@ export function render(markdown: string, opts: RenderOptions = {}): string {
     a: ["anchor"],
     p: ["markdown-alert-title"],
     svg: ["octicon", "octicon-alert", "octicon-link"],
+    h2: ["sr-only"],
+    section: ["footnotes"],
   };
 
   return sanitizeHtml(html, {
@@ -262,7 +264,19 @@ export function render(markdown: string, opts: RenderOptions = {}): string {
         "controls",
         "title",
       ],
-      a: ["id", "aria-hidden", "href", "tabindex", "rel", "target", "title"],
+      a: [
+        "id",
+        "aria-hidden",
+        "href",
+        "tabindex",
+        "rel",
+        "target",
+        "title",
+        "data-footnote-ref",
+        "data-footnote-backref",
+        "aria-label",
+        "aria-describedby",
+      ],
       svg: ["viewbox", "width", "height", "aria-hidden", "background"],
       path: ["fill-rule", "d"],
       circle: ["cx", "cy", "r", "stroke", "stroke-width", "fill", "alpha"],
@@ -273,10 +287,12 @@ export function render(markdown: string, opts: RenderOptions = {}): string {
       h4: ["id"],
       h5: ["id"],
       h6: ["id"],
+      li: ["id"],
       td: ["colspan", "rowspan", "align"],
       iframe: ["src", "width", "height"], // Only used when iframe tags are allowed in the first place.
       math: ["xmlns"], // Only enabled when math is enabled
-      annotation: ["encoding"], // Only enabled when math is enabled
+      annotation: ["encoding"], // Only enabled when math is enabled,
+      section: ["data-footnotes"],
     },
     allowedClasses: { ...defaultAllowedClasses, ...opts.allowedClasses },
     allowProtocolRelative: false,
diff --git a/style.js b/style.js
index 9709f8b..f6bef3e 100644
--- a/style.js
+++ b/style.js
@@ -1,6 +1,6 @@
 /** @type {string} */
 export const CSS =
-  `:root,[data-color-mode=light][data-light-theme=light],[data-color-mode=dark][data-dark-theme=light]{--color-canvas-default-transparent:rgba(255,255,255,0);--color-prettylights-syntax-comment:#57606a;--color-prettylights-syntax-constant:#0550ae;--color-prettylights-syntax-entity:#6639ba;--color-prettylights-syntax-storage-modifier-import:#24292f;--color-prettylights-syntax-entity-tag:#116329;--color-prettylights-syntax-keyword:#cf222e;--color-prettylights-syntax-string:#0a3069;--color-prettylights-syntax-variable:#953800;--color-prettylights-syntax-string-regexp:#116329;--color-prettylights-syntax-markup-deleted-text:#82071e;--color-prettylights-syntax-markup-deleted-bg:#ffebe9;--color-prettylights-syntax-markup-inserted-text:#116329;--color-prettylights-syntax-markup-inserted-bg:#dafbe1;--color-prettylights-syntax-constant-other-reference-link:#0a3069;--color-fg-default:#1f2328;--color-fg-muted:#656d76;--color-canvas-default:#fff;--color-canvas-subtle:#f6f8fa;--color-border-default:#d0d7de;--color-border-muted:#d8dee4;--color-neutral-muted:rgba(175,184,193,.2);--color-accent-fg:#0969da;--color-accent-emphasis:#0969da;--color-danger-fg:#d1242f}:root::selection{--color-canvas-default-transparent:rgba(255,255,255,0);--color-prettylights-syntax-comment:#57606a;--color-prettylights-syntax-constant:#0550ae;--color-prettylights-syntax-entity:#6639ba;--color-prettylights-syntax-storage-modifier-import:#24292f;--color-prettylights-syntax-entity-tag:#116329;--color-prettylights-syntax-keyword:#cf222e;--color-prettylights-syntax-string:#0a3069;--color-prettylights-syntax-variable:#953800;--color-prettylights-syntax-string-regexp:#116329;--color-prettylights-syntax-markup-deleted-text:#82071e;--color-prettylights-syntax-markup-deleted-bg:#ffebe9;--color-prettylights-syntax-markup-inserted-text:#116329;--color-prettylights-syntax-markup-inserted-bg:#dafbe1;--color-prettylights-syntax-constant-other-reference-link:#0a3069;--color-fg-default:#1f2328;--color-fg-muted:#656d76;--color-canvas-default:#fff;--color-canvas-subtle:#f6f8fa;--color-border-default:#d0d7de;--color-border-muted:#d8dee4;--color-neutral-muted:rgba(175,184,193,.2);--color-accent-fg:#0969da;--color-accent-emphasis:#0969da;--color-danger-fg:#d1242f}[data-color-mode=light][data-light-theme=light]::selection{--color-canvas-default-transparent:rgba(255,255,255,0);--color-prettylights-syntax-comment:#57606a;--color-prettylights-syntax-constant:#0550ae;--color-prettylights-syntax-entity:#6639ba;--color-prettylights-syntax-storage-modifier-import:#24292f;--color-prettylights-syntax-entity-tag:#116329;--color-prettylights-syntax-keyword:#cf222e;--color-prettylights-syntax-string:#0a3069;--color-prettylights-syntax-variable:#953800;--color-prettylights-syntax-string-regexp:#116329;--color-prettylights-syntax-markup-deleted-text:#82071e;--color-prettylights-syntax-markup-deleted-bg:#ffebe9;--color-prettylights-syntax-markup-inserted-text:#116329;--color-prettylights-syntax-markup-inserted-bg:#dafbe1;--color-prettylights-syntax-constant-other-reference-link:#0a3069;--color-fg-default:#1f2328;--color-fg-muted:#656d76;--color-canvas-default:#fff;--color-canvas-subtle:#f6f8fa;--color-border-default:#d0d7de;--color-border-muted:#d8dee4;--color-neutral-muted:rgba(175,184,193,.2);--color-accent-fg:#0969da;--color-accent-emphasis:#0969da;--color-danger-fg:#d1242f}[data-color-mode=dark][data-dark-theme=light]::selection{--color-canvas-default-transparent:rgba(255,255,255,0);--color-prettylights-syntax-comment:#57606a;--color-prettylights-syntax-constant:#0550ae;--color-prettylights-syntax-entity:#6639ba;--color-prettylights-syntax-storage-modifier-import:#24292f;--color-prettylights-syntax-entity-tag:#116329;--color-prettylights-syntax-keyword:#cf222e;--color-prettylights-syntax-string:#0a3069;--color-prettylights-syntax-variable:#953800;--color-prettylights-syntax-string-regexp:#116329;--color-prettylights-syntax-markup-deleted-text:#82071e;--color-prettylights-syntax-markup-deleted-bg:#ffebe9;--color-prettylights-syntax-markup-inserted-text:#116329;--color-prettylights-syntax-markup-inserted-bg:#dafbe1;--color-prettylights-syntax-constant-other-reference-link:#0a3069;--color-fg-default:#1f2328;--color-fg-muted:#656d76;--color-canvas-default:#fff;--color-canvas-subtle:#f6f8fa;--color-border-default:#d0d7de;--color-border-muted:#d8dee4;--color-neutral-muted:rgba(175,184,193,.2);--color-accent-fg:#0969da;--color-accent-emphasis:#0969da;--color-danger-fg:#d1242f}[data-color-mode=light][data-light-theme=light] ::-webkit-backdrop{--color-canvas-default-transparent:rgba(255,255,255,0);--color-prettylights-syntax-comment:#57606a;--color-prettylights-syntax-constant:#0550ae;--color-prettylights-syntax-entity:#6639ba;--color-prettylights-syntax-storage-modifier-import:#24292f;--color-prettylights-syntax-entity-tag:#116329;--color-prettylights-syntax-keyword:#cf222e;--color-prettylights-syntax-string:#0a3069;--color-prettylights-syntax-variable:#953800;--color-prettylights-syntax-string-regexp:#116329;--color-prettylights-syntax-markup-deleted-text:#82071e;--color-prettylights-syntax-markup-deleted-bg:#ffebe9;--color-prettylights-syntax-markup-inserted-text:#116329;--color-prettylights-syntax-markup-inserted-bg:#dafbe1;--color-prettylights-syntax-constant-other-reference-link:#0a3069;--color-fg-default:#1f2328;--color-fg-muted:#656d76;--color-canvas-default:#fff;--color-canvas-subtle:#f6f8fa;--color-border-default:#d0d7de;--color-border-muted:#d8dee4;--color-neutral-muted:rgba(175,184,193,.2);--color-accent-fg:#0969da;--color-accent-emphasis:#0969da;--color-danger-fg:#d1242f}[data-color-mode=light][data-light-theme=light] ::backdrop{--color-canvas-default-transparent:rgba(255,255,255,0);--color-prettylights-syntax-comment:#57606a;--color-prettylights-syntax-constant:#0550ae;--color-prettylights-syntax-entity:#6639ba;--color-prettylights-syntax-storage-modifier-import:#24292f;--color-prettylights-syntax-entity-tag:#116329;--color-prettylights-syntax-keyword:#cf222e;--color-prettylights-syntax-string:#0a3069;--color-prettylights-syntax-variable:#953800;--color-prettylights-syntax-string-regexp:#116329;--color-prettylights-syntax-markup-deleted-text:#82071e;--color-prettylights-syntax-markup-deleted-bg:#ffebe9;--color-prettylights-syntax-markup-inserted-text:#116329;--color-prettylights-syntax-markup-inserted-bg:#dafbe1;--color-prettylights-syntax-constant-other-reference-link:#0a3069;--color-fg-default:#1f2328;--color-fg-muted:#656d76;--color-canvas-default:#fff;--color-canvas-subtle:#f6f8fa;--color-border-default:#d0d7de;--color-border-muted:#d8dee4;--color-neutral-muted:rgba(175,184,193,.2);--color-accent-fg:#0969da;--color-accent-emphasis:#0969da;--color-danger-fg:#d1242f}[data-color-mode=dark][data-dark-theme=light] ::-webkit-backdrop{--color-canvas-default-transparent:rgba(255,255,255,0);--color-prettylights-syntax-comment:#57606a;--color-prettylights-syntax-constant:#0550ae;--color-prettylights-syntax-entity:#6639ba;--color-prettylights-syntax-storage-modifier-import:#24292f;--color-prettylights-syntax-entity-tag:#116329;--color-prettylights-syntax-keyword:#cf222e;--color-prettylights-syntax-string:#0a3069;--color-prettylights-syntax-variable:#953800;--color-prettylights-syntax-string-regexp:#116329;--color-prettylights-syntax-markup-deleted-text:#82071e;--color-prettylights-syntax-markup-deleted-bg:#ffebe9;--color-prettylights-syntax-markup-inserted-text:#116329;--color-prettylights-syntax-markup-inserted-bg:#dafbe1;--color-prettylights-syntax-constant-other-reference-link:#0a3069;--color-fg-default:#1f2328;--color-fg-muted:#656d76;--color-canvas-default:#fff;--color-canvas-subtle:#f6f8fa;--color-border-default:#d0d7de;--color-border-muted:#d8dee4;--color-neutral-muted:rgba(175,184,193,.2);--color-accent-fg:#0969da;--color-accent-emphasis:#0969da;--color-danger-fg:#d1242f}[data-color-mode=dark][data-dark-theme=light] ::backdrop{--color-canvas-default-transparent:rgba(255,255,255,0);--color-prettylights-syntax-comment:#57606a;--color-prettylights-syntax-constant:#0550ae;--color-prettylights-syntax-entity:#6639ba;--color-prettylights-syntax-storage-modifier-import:#24292f;--color-prettylights-syntax-entity-tag:#116329;--color-prettylights-syntax-keyword:#cf222e;--color-prettylights-syntax-string:#0a3069;--color-prettylights-syntax-variable:#953800;--color-prettylights-syntax-string-regexp:#116329;--color-prettylights-syntax-markup-deleted-text:#82071e;--color-prettylights-syntax-markup-deleted-bg:#ffebe9;--color-prettylights-syntax-markup-inserted-text:#116329;--color-prettylights-syntax-markup-inserted-bg:#dafbe1;--color-prettylights-syntax-constant-other-reference-link:#0a3069;--color-fg-default:#1f2328;--color-fg-muted:#656d76;--color-canvas-default:#fff;--color-canvas-subtle:#f6f8fa;--color-border-default:#d0d7de;--color-border-muted:#d8dee4;--color-neutral-muted:rgba(175,184,193,.2);--color-accent-fg:#0969da;--color-accent-emphasis:#0969da;--color-danger-fg:#d1242f}@media 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UI,Noto Sans,Helvetica,Arial,sans-serif,Apple Color Emoji,Segoe UI Emoji;font-size:16px;line-height:1.5}.markdown-body:before{content:"";display:table}.markdown-body:after{clear:both;content:"";display:table}.markdown-body>:first-child{margin-top:0!important}.markdown-body>:last-child{margin-bottom:0!important}.markdown-body a:not([href]){color:inherit;text-decoration:none}.markdown-body .absent{color:var(--fgColor-danger,var(--color-danger-fg))}.markdown-body .anchor{float:left;margin-left:-20px;padding-right:4px;line-height:1}.markdown-body .anchor:focus{outline:none}.markdown-body p,.markdown-body blockquote,.markdown-body ul,.markdown-body ol,.markdown-body dl,.markdown-body table,.markdown-body pre,.markdown-body details{margin-top:0;margin-bottom:16px}.markdown-body hr{background-color:var(--borderColor-default,var(--color-border-default));border:0;height:.25em;margin:24px 0;padding:0}.markdown-body blockquote{color:var(--fgColor-muted,var(--color-fg-muted));border-left:.25em solid var(--borderColor-default,var(--color-border-default));padding:0 1em}.markdown-body blockquote>:first-child{margin-top:0}.markdown-body blockquote>:last-child{margin-bottom:0}.markdown-body h1,.markdown-body h2,.markdown-body h3,.markdown-body h4,.markdown-body h5,.markdown-body h6{font-weight:var(--base-text-weight-semibold,600);margin-top:24px;margin-bottom:16px;line-height:1.25}.markdown-body h1 .octicon-link,.markdown-body h2 .octicon-link,.markdown-body h3 .octicon-link,.markdown-body h4 .octicon-link,.markdown-body h5 .octicon-link,.markdown-body h6 .octicon-link{color:var(--fgColor-default,var(--color-fg-default));vertical-align:middle;visibility:hidden}.markdown-body h1:hover .anchor,.markdown-body h2:hover .anchor,.markdown-body h3:hover .anchor,.markdown-body h4:hover .anchor,.markdown-body h5:hover .anchor,.markdown-body h6:hover .anchor{text-decoration:none}.markdown-body h1:hover .anchor .octicon-link,.markdown-body h2:hover .anchor .octicon-link,.markdown-body h3:hover .anchor .octicon-link,.markdown-body h4:hover .anchor .octicon-link,.markdown-body h5:hover .anchor .octicon-link,.markdown-body h6:hover .anchor .octicon-link{visibility:visible}.markdown-body h1 tt,.markdown-body h1 code,.markdown-body h2 tt,.markdown-body h2 code,.markdown-body h3 tt,.markdown-body h3 code,.markdown-body h4 tt,.markdown-body h4 code,.markdown-body h5 tt,.markdown-body h5 code,.markdown-body h6 tt,.markdown-body h6 code{font-size:inherit;padding:0 .2em}.markdown-body h1{border-bottom:1px solid var(--borderColor-muted,var(--color-border-muted));padding-bottom:.3em;font-size:2em}.markdown-body h2{border-bottom:1px solid var(--borderColor-muted,var(--color-border-muted));padding-bottom:.3em;font-size:1.5em}.markdown-body h3{font-size:1.25em}.markdown-body h4{font-size:1em}.markdown-body h5{font-size:.875em}.markdown-body h6{color:var(--fgColor-muted,var(--color-fg-muted));font-size:.85em}.markdown-body summary h1,.markdown-body summary h2,.markdown-body summary h3,.markdown-body summary h4,.markdown-body summary h5,.markdown-body summary h6{display:inline-block}.markdown-body summary h1 .anchor,.markdown-body summary h2 .anchor,.markdown-body summary h3 .anchor,.markdown-body summary h4 .anchor,.markdown-body summary h5 .anchor,.markdown-body summary h6 .anchor{margin-left:-40px}.markdown-body summary h1,.markdown-body summary h2{border-bottom:0;padding-bottom:0}.markdown-body ul,.markdown-body ol{padding-left:2em}.markdown-body ul.no-list,.markdown-body ol.no-list{padding:0;list-style-type:none}.markdown-body ol[type=a\ s]{list-style-type:lower-alpha}.markdown-body ol[type=A\ s]{list-style-type:upper-alpha}.markdown-body ol[type=i\ s]{list-style-type:lower-roman}.markdown-body ol[type=I\ s]{list-style-type:upper-roman}.markdown-body ol[type="1"]{list-style-type:decimal}.markdown-body div>ol:not([type]){list-style-type:decimal}.markdown-body ul ul,.markdown-body ul ol,.markdown-body ol ol,.markdown-body ol ul{margin-top:0;margin-bottom:0}.markdown-body li>p{margin-top:16px}.markdown-body li+li{margin-top:.25em}.markdown-body dl{padding:0}.markdown-body dl dt{font-size:1em;font-style:italic;font-weight:var(--base-text-weight-semibold,600);margin-top:16px;padding:0}.markdown-body dl dd{margin-bottom:16px;padding:0 16px}.markdown-body table{width:100%;width:max-content;max-width:100%;display:block;overflow:auto}.markdown-body table th{font-weight:var(--base-text-weight-semibold,600)}.markdown-body table th,.markdown-body table td{border:1px solid var(--borderColor-default,var(--color-border-default));padding:6px 13px}.markdown-body table td>:last-child{margin-bottom:0}.markdown-body table tr{background-color:var(--bgColor-default,var(--color-canvas-default));border-top:1px solid var(--borderColor-muted,var(--color-border-muted))}.markdown-body table tr:nth-child(2n){background-color:var(--bgColor-muted,var(--color-canvas-subtle))}.markdown-body table img{background-color:transparent}.markdown-body img{box-sizing:content-box;background-color:var(--bgColor-default,var(--color-canvas-default));max-width:100%}.markdown-body img[align=right]{padding-left:20px}.markdown-body img[align=left]{padding-right:20px}.markdown-body .emoji{vertical-align:text-top;background-color:transparent;max-width:none}.markdown-body span.frame{display:block;overflow:hidden}.markdown-body span.frame>span{float:left;border:1px solid var(--borderColor-default,var(--color-border-default));width:auto;margin:13px 0 0;padding:7px;display:block;overflow:hidden}.markdown-body span.frame span img{float:left;display:block}.markdown-body span.frame span span{clear:both;color:var(--fgColor-default,var(--color-fg-default));padding:5px 0 0;display:block}.markdown-body span.align-center{clear:both;display:block;overflow:hidden}.markdown-body span.align-center>span{text-align:center;margin:13px auto 0;display:block;overflow:hidden}.markdown-body span.align-center span img{text-align:center;margin:0 auto}.markdown-body span.align-right{clear:both;display:block;overflow:hidden}.markdown-body span.align-right>span{text-align:right;margin:13px 0 0;display:block;overflow:hidden}.markdown-body span.align-right span img{text-align:right;margin:0}.markdown-body span.float-left{float:left;margin-right:13px;display:block;overflow:hidden}.markdown-body span.float-left span{margin:13px 0 0}.markdown-body span.float-right{float:right;margin-left:13px;display:block;overflow:hidden}.markdown-body span.float-right>span{text-align:right;margin:13px auto 0;display:block;overflow:hidden}.markdown-body code,.markdown-body tt{white-space:break-spaces;background-color:var(--bgColor-neutral-muted,var(--color-neutral-muted));border-radius:6px;margin:0;padding:.2em .4em;font-size:85%}.markdown-body code br,.markdown-body tt br{display:none}.markdown-body del code{-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;text-decoration:inherit}.markdown-body samp{font-size:85%}.markdown-body pre{word-wrap:normal}.markdown-body pre code{font-size:100%}.markdown-body pre>code{word-break:normal;white-space:pre;background:0 0;border:0;margin:0;padding:0}.markdown-body .highlight{margin-bottom:16px}.markdown-body .highlight pre{word-break:normal;margin-bottom:0}.markdown-body .highlight pre,.markdown-body pre{color:var(--fgColor-default,var(--color-fg-default));background-color:var(--bgColor-muted,var(--color-canvas-subtle));border-radius:6px;padding:16px;font-size:85%;line-height:1.45;overflow:auto}.markdown-body pre code,.markdown-body pre tt{max-width:auto;line-height:inherit;word-wrap:normal;background-color:transparent;border:0;margin:0;padding:0;display:inline;overflow:visible}.markdown-body .csv-data td,.markdown-body .csv-data th{text-align:left;white-space:nowrap;padding:5px;font-size:12px;line-height:1;overflow:hidden}.markdown-body .csv-data .blob-num{text-align:right;background:var(--bgColor-default,var(--color-canvas-default));border:0;padding:10px 8px 9px}.markdown-body .csv-data tr{border-top:0}.markdown-body .csv-data th{font-weight:var(--base-text-weight-semibold,600);background:var(--bgColor-muted,var(--color-canvas-subtle));border-top:0}.markdown-body [data-footnote-ref]:before{content:"["}.markdown-body [data-footnote-ref]:after{content:"]"}.markdown-body .footnotes{color:var(--fgColor-muted,var(--color-fg-muted));border-top:1px solid var(--borderColor-default,var(--color-border-default));font-size:12px}.markdown-body .footnotes ol{padding-left:16px}.markdown-body .footnotes ol ul{margin-top:16px;padding-left:16px;display:inline-block}.markdown-body .footnotes li{position:relative}.markdown-body .footnotes li:target:before{pointer-events:none;content:"";border:2px solid var(--borderColor-accent-emphasis,var(--color-accent-emphasis));border-radius:6px;position:absolute;top:-8px;bottom:-8px;left:-24px;right:-8px}.markdown-body .footnotes li:target{color:var(--fgColor-default,var(--color-fg-default))}.markdown-body .footnotes .data-footnote-backref g-emoji{font-family:monospace}.markdown-body{background-color:var(--color-canvas-default);color:var(--color-fg-default)}.markdown-body a{color:var(--color-accent-fg);text-decoration:none}.markdown-body a:hover{text-decoration:underline}.markdown-body img[align=center]{margin:0 auto}.markdown-body iframe{background-color:#fff;border:0;margin-bottom:16px}.markdown-body svg.octicon{fill:currentColor}.markdown-body .anchor>.octicon{display:inline}.markdown-body figcaption{text-align:center;padding-top:2px}.markdown-body .highlight .token.keyword,.gfm-highlight .token.keyword{color:var(--color-prettylights-syntax-keyword)}.markdown-body .highlight .token.tag .token.class-name,.markdown-body .highlight .token.tag .token.script .token.punctuation,.gfm-highlight .token.tag .token.class-name,.gfm-highlight .token.tag .token.script .token.punctuation{color:var(--color-prettylights-syntax-storage-modifier-import)}.markdown-body .highlight .token.operator,.markdown-body .highlight .token.number,.markdown-body .highlight .token.boolean,.markdown-body .highlight .token.tag .token.punctuation,.markdown-body .highlight .token.tag .token.script .token.script-punctuation,.markdown-body .highlight .token.tag .token.attr-name,.gfm-highlight .token.operator,.gfm-highlight .token.number,.gfm-highlight .token.boolean,.gfm-highlight .token.tag .token.punctuation,.gfm-highlight .token.tag .token.script .token.script-punctuation,.gfm-highlight .token.tag .token.attr-name{color:var(--color-prettylights-syntax-constant)}.markdown-body .highlight .token.function,.gfm-highlight .token.function{color:var(--color-prettylights-syntax-entity)}.markdown-body .highlight .token.string,.gfm-highlight .token.string{color:var(--color-prettylights-syntax-string)}.markdown-body .highlight .token.comment,.gfm-highlight .token.comment{color:var(--color-prettylights-syntax-comment)}.markdown-body .highlight .token.class-name,.gfm-highlight .token.class-name{color:var(--color-prettylights-syntax-variable)}.markdown-body .highlight .token.regex,.gfm-highlight .token.regex{color:var(--color-prettylights-syntax-string)}.markdown-body .highlight .token.regex .regex-delimiter,.gfm-highlight .token.regex .regex-delimiter{color:var(--color-prettylights-syntax-constant)}.markdown-body .highlight .token.tag .token.tag,.markdown-body .highlight .token.property,.gfm-highlight .token.tag .token.tag,.gfm-highlight .token.property{color:var(--color-prettylights-syntax-entity-tag)}.markdown-body .highlight .token.deleted,.gfm-highlight .token.deleted{color:var(--color-prettylights-syntax-markup-deleted-text);background-color:var(--color-prettylights-syntax-markup-deleted-bg)}.markdown-body .highlight .token.inserted,.gfm-highlight .token.inserted{color:var(--color-prettylights-syntax-markup-inserted-text);background-color:var(--color-prettylights-syntax-markup-inserted-bg)}.sr-only{clip:rect(0,0,0,0);word-wrap:normal;border:0;width:1px;height:1px;padding:0;position:absolute;overflow:hidden}[data-footnote-ref]:before{content:"["}[data-footnote-ref]:after{content:"]"}`;
 
 /** @type {string} */
 export const KATEX_CSS =
diff --git a/style/main.scss b/style/main.scss
index 8145f9c..1603f00 100644
--- a/style/main.scss
+++ b/style/main.scss
@@ -100,3 +100,22 @@
     background-color: var(--color-prettylights-syntax-markup-inserted-bg);
   }
 }
+
+.sr-only {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  overflow: hidden;
+  clip: rect(0, 0, 0, 0);
+  word-wrap: normal;
+  border: 0;
+}
+
+[data-footnote-ref]::before {
+  content: '[';
+}
+
+[data-footnote-ref]::after {
+  content: ']';
+}
diff --git a/test/fixtures/footnote.html b/test/fixtures/footnote.html
index 93533be..da952ce 100644
--- a/test/fixtures/footnote.html
+++ b/test/fixtures/footnote.html
@@ -1,15 +1,30 @@
-<p>Here is a simple footnote<sup><a id="footnote-ref-1" href="#footnote-1">1</a></sup>. With some additional text after it<sup><a id="footnote-ref-%40%23%24%25" href="#footnote-%40%23%24%25">2</a></sup> and
-without disrupting the blocks<sup><a id="footnote-ref-bignote" href="#footnote-bignote">3</a></sup>.</p>
-<section>
-<h2 id="footnote-label">Footnotes</h2>
+<h1 id="example"><a class="anchor" aria-hidden="true" tabindex="-1" href="#example"><svg class="octicon octicon-link" viewbox="0 0 16 16" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M7.775 3.275a.75.75 0 001.06 1.06l1.25-1.25a2 2 0 112.83 2.83l-2.5 2.5a2 2 0 01-2.83 0 .75.75 0 00-1.06 1.06 3.5 3.5 0 004.95 0l2.5-2.5a3.5 3.5 0 00-4.95-4.95l-1.25 1.25zm-4.69 9.64a2 2 0 010-2.83l2.5-2.5a2 2 0 012.83 0 .75.75 0 001.06-1.06 3.5 3.5 0 00-4.95 0l-2.5 2.5a3.5 3.5 0 004.95 4.95l1.25-1.25a.75.75 0 00-1.06-1.06l-1.25 1.25a2 2 0 01-2.83 0z"></path></svg></a>Example</h1><p>Here is a simple footnote<sup><a id="footnote-ref-1" href="#footnote-1" data-footnote-ref aria-describedby="footnote-label">1</a></sup>.
+<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />
+<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />
+<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />
+<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />
+<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /> With some additional text after it<sup><a id="footnote-ref-%40%23%24%25" href="#footnote-%40%23%24%25" data-footnote-ref aria-describedby="footnote-label">2</a></sup>
+<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />
+<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />
+<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />
+<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />
+<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /> and without disrupting the
+blocks<sup><a id="footnote-ref-bignote" href="#footnote-bignote" data-footnote-ref aria-describedby="footnote-label">3</a></sup>.
+<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />
+<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />
+<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />
+<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />
+<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /></p>
+<section class="footnotes" data-footnotes>
+<h2 id="footnote-label" class="sr-only">Footnotes</h2>
 <ol>
-<li>
-<p>This is a footnote content. <a href="#footnote-ref-1">↩</a></p>
+<li id="footnote-1">
+<p>This is a footnote content. <a href="#footnote-ref-1" data-footnote-backref aria-label="Back to reference 1">↩</a></p>
 </li>
-<li>
-<p>A footnote on the label: "@#$%". <a href="#footnote-ref-%40%23%24%25">↩</a></p>
+<li id="footnote-%40%23%24%25">
+<p>A footnote on the label: "@#$%". <a href="#footnote-ref-%40%23%24%25" data-footnote-backref aria-label="Back to reference @#$%">↩</a></p>
 </li>
-<li>
+<li id="footnote-bignote">
 <p>The first paragraph of the definition.</p>
 <p>Paragraph two of the definition.</p>
 <blockquote>
@@ -36,7 +51,7 @@ <h2 id="footnote-label">Footnotes</h2>
 <li>Subitem 2</li>
 </ul>
 </li>
-</ul> <a href="#footnote-ref-bignote">↩</a>
+</ul> <a href="#footnote-ref-bignote" data-footnote-backref aria-label="Back to reference bignote">↩</a>
 </li>
 </ol>
 </section>
diff --git a/test/fixtures/footnote.md b/test/fixtures/footnote.md
index f431fec..ef64c11 100644
--- a/test/fixtures/footnote.md
+++ b/test/fixtures/footnote.md
@@ -1,7 +1,24 @@
+# Example
+
 [^1]: This is a footnote content.
 
-Here is a simple footnote[^1]. With some additional text after it[^@#$%] and
-without disrupting the blocks[^bignote].
+Here is a simple footnote[^1].
+<br><br><br><br><br><br><br><br><br><br><br>
+<br><br><br><br><br><br><br><br><br><br><br>
+<br><br><br><br><br><br><br><br><br><br><br>
+<br><br><br><br><br><br><br><br><br><br><br>
+<br><br><br><br><br><br><br><br><br><br><br> With some additional text after it[^@#$%]
+<br><br><br><br><br><br><br><br><br><br><br>
+<br><br><br><br><br><br><br><br><br><br><br>
+<br><br><br><br><br><br><br><br><br><br><br>
+<br><br><br><br><br><br><br><br><br><br><br>
+<br><br><br><br><br><br><br><br><br><br><br> and without disrupting the
+blocks[^bignote].
+<br><br><br><br><br><br><br><br><br><br><br>
+<br><br><br><br><br><br><br><br><br><br><br>
+<br><br><br><br><br><br><br><br><br><br><br>
+<br><br><br><br><br><br><br><br><br><br><br>
+<br><br><br><br><br><br><br><br><br><br><br>
 
 [^bignote]: The first paragraph of the definition.
 
diff --git a/test/server_test.ts b/test/server_test.ts
index 17974af..d8dc36b 100644
--- a/test/server_test.ts
+++ b/test/server_test.ts
@@ -1,4 +1,4 @@
-import { assert } from "./test_deps.ts";
+import { assert, assertEquals } from "./test_deps.ts";
 import { render } from "../mod.ts";
 import { browserTest, setupHtmlWithCss } from "./test_utils.ts";
 
@@ -91,3 +91,85 @@ Deno.test("basic md table with dollar signs", async () => {
     );
   });
 });
+
+Deno.test("footnote with style", async () => {
+  const markdown = Deno.readTextFileSync("./test/fixtures/footnote.md");
+
+  const body = render(markdown);
+  const html = setupHtmlWithCss(body);
+
+  await browserTest(html, async (page, address) => {
+    await page.goto(`${address}`);
+
+    // 1. Test page jump on clicking footnote links
+    const scrollPositionBefore = await page.evaluate(() => window.scrollY);
+    await page.click("#footnote-ref-1"); // click the first footnote link. note that we select by id, not href
+    const scrollPositionAfter = await page.evaluate(() => window.scrollY);
+    assert(scrollPositionAfter > scrollPositionBefore);
+
+    await page.click("#footnote-ref-bignote");
+    const scrollPositionAfter2 = await page.evaluate(() => window.scrollY);
+    assert(scrollPositionAfter2 === scrollPositionAfter);
+
+    await page.click("#footnote-1 > p > a");
+    const scrollPositionAfter3 = await page.evaluate(() => window.scrollY);
+    assert(scrollPositionAfter3 < scrollPositionAfter2);
+    assert(scrollPositionAfter3 > scrollPositionBefore);
+
+    // 2. Verify footnote link styling
+    const beforeContent = await page.evaluate(() => {
+      const element = document.querySelector("#footnote-ref-1");
+      if (element) {
+        return window.getComputedStyle(element, "::before").content;
+      }
+      return null;
+    });
+    const afterContent = await page.evaluate(() => {
+      const element = document.querySelector("#footnote-ref-1");
+      if (element) {
+        return window.getComputedStyle(element, "::after").content;
+      }
+      return null;
+    });
+    assertEquals(beforeContent, '"["');
+    assertEquals(afterContent, '"]"');
+
+    // 3. Check Visibility of "Footnotes" H2
+    const h2Style = await page.evaluate(() => {
+      const element = document.querySelector("#footnote-label");
+      if (element) {
+        const computedStyle = window.getComputedStyle(element);
+        return {
+          position: computedStyle.position,
+          width: computedStyle.width,
+          height: computedStyle.height,
+          overflow: computedStyle.overflow,
+          clip: computedStyle.clip,
+          wordWrap: computedStyle.wordWrap,
+          border: computedStyle.border,
+        };
+      }
+      return null;
+    });
+    assert(h2Style);
+    assertEquals(h2Style.position, "absolute");
+    assertEquals(h2Style.width, "1px");
+    assertEquals(h2Style.height, "1px");
+    assertEquals(h2Style.overflow, "hidden");
+    assertEquals(h2Style.clip, "rect(0px, 0px, 0px, 0px)");
+    assertEquals(h2Style.wordWrap, "normal");
+    assertEquals(h2Style.border, "");
+
+    // 4. Verify blue box around the footnote after clicking
+    await page.click("#footnote-ref-1");
+    const footnoteStyle = await page.evaluate(() => {
+      const element = document.querySelector("#footnote-1");
+      if (element) {
+        return window.getComputedStyle(element)
+          .outlineColor;
+      }
+      return null;
+    });
+    assertEquals(footnoteStyle, "rgb(31, 35, 40)");
+  });
+});
diff --git a/test/test_utils.ts b/test/test_utils.ts
index ca0737e..80199b6 100644
--- a/test/test_utils.ts
+++ b/test/test_utils.ts
@@ -35,8 +35,6 @@ function startServer(htmlContent: string, port: number) {
   const hostname = "localhost";
   const address = `http://${hostname}:${port}`;
 
-  console.log(`Server running at ${address}`);
-
   return { serverProcess, address };
 }