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Heading anchors are double URL-encoded for non-Latin scripts (Japanese, Chinese, Korean, Cyrillic, etc.) #89

Open
Open
Heading anchors are double URL-encoded for non-Latin scripts (Japanese, Chinese, Korean, Cyrillic, etc.)#89

Description

@kaitohm
kaitohm
opened on Aug 17, 2026

Summary

simpletoc_sanitize_string() applies rawurlencode() to a string that sanitize_title_with_dashes() has already percent-encoded. For non-Latin headings this produces double-encoded anchors. Latin-script headings are unaffected, which could be why this has gone unnoticed.

Note: This is a bug I came across on my site and I had AI find the cause for me. This issue was written with the assistance of AI.

Steps to reproduce

  1. On a site with SimpleTOC active, create a post with two headings:
    • Test Heading ABC
    • テスト見出し
  2. Save and inspect the rendered heading id attributes.

Actual

<h2id="test-heading-abc">Test Heading ABC</h2><h2id="%25e3%2583%2586%25e3%2582%25b9%25e3%2583%2588%25e8%25a6%258b%25e5%2587%25ba%25e3%2581%2597">テスト見出し</h2>

Expected

<h2id="%e3%83%86%e3%82%b9%e3%83%88%e8%a6%8b%e5%87%ba%e3%81%97">テスト見出し</h2>

Cause

In plugin.php, simpletoc_sanitize_string():

$sanitized_string = sanitize_title_with_dashes( $string_without_accents );
// Encode for use in an url.$urlencoded = rawurlencode( $sanitized_string );
return$urlencoded;

sanitize_title_with_dashes() already calls utf8_uri_encode(), so its return value is percent-encoded for any non-ASCII input. rawurlencode() then escapes each % as %25.

For ASCII input the output contains no %, so rawurlencode() is a no-op — the defect cannot manifest in Latin script.

Suggested fix

Drop the rawurlencode() call; sanitize_title_with_dashes() already returns a URL-safe slug.

returnsanitize_title_with_dashes( $string_without_accents );

Impact

In-page TOC links still resolve, because get_included_toc_headings() and add_anchor_attribute() generate the anchor the same way. But any externally shared, hand-written, or search-indexed fragment link to a non-Latin heading will not match, and the URLs are unreadable when shared.

Manually set HTML anchors are unaffected — add_anchor_attribute() correctly skips headings that already have an id.

Environment

  • SimpleTOC 7.1.1
  • WordPress.com, site language ja

Metadata

Metadata

Assignees

No one assigned

    Labels

    No labels
    No labels

    Projects

    No projects

      Milestone

      No milestone

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      None yet

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      No branches or pull requests

      Issue actions

      , 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
       blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
Heading anchors are double URL-encoded for non-Latin scripts (Japanese, Chinese, Korean, Cyrillic, etc.) · Issue #89 · mtoensing/simpletoc · GitHub
      Skip to content
      Heading anchors are double URL-encoded for non-Latin scripts (Japanese, Chinese, Korean, Cyrillic, etc.) #89
      Open
      Open
      Heading anchors are double URL-encoded for non-Latin scripts (Japanese, Chinese, Korean, Cyrillic, etc.)#89
      Description
      @kaitohm
      kaitohm
      opened on Aug 17, 2026
      Summary
      simpletoc_sanitize_string() applies rawurlencode() to a string that sanitize_title_with_dashes() has already percent-encoded. For non-Latin headings this produces double-encoded anchors. Latin-script headings are unaffected, which could be why this has gone unnoticed.
      Note: This is a bug I came across on my site and I had AI find the cause for me. This issue was written with the assistance of AI.
      Steps to reproduce
      1. On a site with SimpleTOC active, create a post with two headings:

        • Test Heading ABC
        • テスト見出し
      2. Save and inspect the rendered heading id attributes.
      Actual
      <h2id="test-heading-abc">Test Heading ABC</h2><h2id="%25e3%2583%2586%25e3%2582%25b9%25e3%2583%2588%25e8%25a6%258b%25e5%2587%25ba%25e3%2581%2597">テスト見出し</h2>
      Expected
      <h2id="%e3%83%86%e3%82%b9%e3%83%88%e8%a6%8b%e5%87%ba%e3%81%97">テスト見出し</h2>
      Cause
      In plugin.php, simpletoc_sanitize_string():
      $sanitized_string = sanitize_title_with_dashes( $string_without_accents );
// Encode for use in an url.$urlencoded = rawurlencode( $sanitized_string );
return$urlencoded;
      sanitize_title_with_dashes() already calls utf8_uri_encode(), so its return value is percent-encoded for any non-ASCII input. rawurlencode() then escapes each % as %25.
      For ASCII input the output contains no %, so rawurlencode() is a no-op — the defect cannot manifest in Latin script.
      Suggested fix
      Drop the rawurlencode() call; sanitize_title_with_dashes() already returns a URL-safe slug.
      returnsanitize_title_with_dashes( $string_without_accents );
      Impact
      In-page TOC links still resolve, because get_included_toc_headings() and add_anchor_attribute() generate the anchor the same way. But any externally shared, hand-written, or search-indexed fragment link to a non-Latin heading will not match, and the URLs are unreadable when shared.
      Manually set HTML anchors are unaffected — add_anchor_attribute() correctly skips headings that already have an id.
      Environment
      • SimpleTOC 7.1.1
      • WordPress.com, site language ja
      Metadata
      Metadata
      Assignees
      No one assigned
        Labels
        No labels
        No labels
        Projects
        No projects
          Milestone
          No milestone
          Relationships
          None yet
          Development
          No branches or pull requests
          Issue actions
          
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Heading anchors are double URL-encoded for non-Latin scripts (Japanese, Chinese, Korean, Cyrillic, etc.) · Issue #89 · mtoensing/simpletoc · GitHub
          Skip to content
          Heading anchors are double URL-encoded for non-Latin scripts (Japanese, Chinese, Korean, Cyrillic, etc.) #89
          Open
          Open
          Heading anchors are double URL-encoded for non-Latin scripts (Japanese, Chinese, Korean, Cyrillic, etc.)#89
          Description
          @kaitohm
          kaitohm
          opened on Aug 17, 2026
          Summary
          simpletoc_sanitize_string() applies rawurlencode() to a string that sanitize_title_with_dashes() has already percent-encoded. For non-Latin headings this produces double-encoded anchors. Latin-script headings are unaffected, which could be why this has gone unnoticed.
          Note: This is a bug I came across on my site and I had AI find the cause for me. This issue was written with the assistance of AI.
          Steps to reproduce
          1. On a site with SimpleTOC active, create a post with two headings:

            • Test Heading ABC
            • テスト見出し
          2. Save and inspect the rendered heading id attributes.
          Actual
          <h2id="test-heading-abc">Test Heading ABC</h2><h2id="%25e3%2583%2586%25e3%2582%25b9%25e3%2583%2588%25e8%25a6%258b%25e5%2587%25ba%25e3%2581%2597">テスト見出し</h2>
          Expected
          <h2id="%e3%83%86%e3%82%b9%e3%83%88%e8%a6%8b%e5%87%ba%e3%81%97">テスト見出し</h2>
          Cause
          In plugin.php, simpletoc_sanitize_string():
          $sanitized_string = sanitize_title_with_dashes( $string_without_accents );
// Encode for use in an url.$urlencoded = rawurlencode( $sanitized_string );
return$urlencoded;
          sanitize_title_with_dashes() already calls utf8_uri_encode(), so its return value is percent-encoded for any non-ASCII input. rawurlencode() then escapes each % as %25.
          For ASCII input the output contains no %, so rawurlencode() is a no-op — the defect cannot manifest in Latin script.
          Suggested fix
          Drop the rawurlencode() call; sanitize_title_with_dashes() already returns a URL-safe slug.
          returnsanitize_title_with_dashes( $string_without_accents );
          Impact
          In-page TOC links still resolve, because get_included_toc_headings() and add_anchor_attribute() generate the anchor the same way. But any externally shared, hand-written, or search-indexed fragment link to a non-Latin heading will not match, and the URLs are unreadable when shared.
          Manually set HTML anchors are unaffected — add_anchor_attribute() correctly skips headings that already have an id.
          Environment
          • SimpleTOC 7.1.1
          • WordPress.com, site language ja
          Metadata
          Metadata
          Assignees
          No one assigned
            Labels
            No labels
            No labels
            Projects
            No projects
              Milestone
              No milestone
              Relationships
              None yet
              Development
              No branches or pull requests
              Issue actions
              
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Heading anchors are double URL-encoded for non-Latin scripts (Japanese, Chinese, Korean, Cyrillic, etc.) · Issue #89 · mtoensing/simpletoc · GitHub
              Skip to content
              Heading anchors are double URL-encoded for non-Latin scripts (Japanese, Chinese, Korean, Cyrillic, etc.) #89
              Open
              Open
              Heading anchors are double URL-encoded for non-Latin scripts (Japanese, Chinese, Korean, Cyrillic, etc.)#89
              Description
              @kaitohm
              kaitohm
              opened on Aug 17, 2026
              Summary
              simpletoc_sanitize_string() applies rawurlencode() to a string that sanitize_title_with_dashes() has already percent-encoded. For non-Latin headings this produces double-encoded anchors. Latin-script headings are unaffected, which could be why this has gone unnoticed.
              Note: This is a bug I came across on my site and I had AI find the cause for me. This issue was written with the assistance of AI.
              Steps to reproduce
              1. On a site with SimpleTOC active, create a post with two headings:

                • Test Heading ABC
                • テスト見出し
              2. Save and inspect the rendered heading id attributes.
              Actual
              <h2id="test-heading-abc">Test Heading ABC</h2><h2id="%25e3%2583%2586%25e3%2582%25b9%25e3%2583%2588%25e8%25a6%258b%25e5%2587%25ba%25e3%2581%2597">テスト見出し</h2>
              Expected
              <h2id="%e3%83%86%e3%82%b9%e3%83%88%e8%a6%8b%e5%87%ba%e3%81%97">テスト見出し</h2>
              Cause
              In plugin.php, simpletoc_sanitize_string():
              $sanitized_string = sanitize_title_with_dashes( $string_without_accents );
// Encode for use in an url.$urlencoded = rawurlencode( $sanitized_string );
return$urlencoded;
              sanitize_title_with_dashes() already calls utf8_uri_encode(), so its return value is percent-encoded for any non-ASCII input. rawurlencode() then escapes each % as %25.
              For ASCII input the output contains no %, so rawurlencode() is a no-op — the defect cannot manifest in Latin script.
              Suggested fix
              Drop the rawurlencode() call; sanitize_title_with_dashes() already returns a URL-safe slug.
              returnsanitize_title_with_dashes( $string_without_accents );
              Impact
              In-page TOC links still resolve, because get_included_toc_headings() and add_anchor_attribute() generate the anchor the same way. But any externally shared, hand-written, or search-indexed fragment link to a non-Latin heading will not match, and the URLs are unreadable when shared.
              Manually set HTML anchors are unaffected — add_anchor_attribute() correctly skips headings that already have an id.
              Environment
              • SimpleTOC 7.1.1
              • WordPress.com, site language ja
              Metadata
              Metadata
              Assignees
              No one assigned
                Labels
                No labels
                No labels
                Projects
                No projects
                  Milestone
                  No milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions
                  
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
Heading anchors are double URL-encoded for non-Latin scripts (Japanese, Chinese, Korean, Cyrillic, etc.) · Issue #89 · mtoensing/simpletoc · GitHub
                  Skip to content
                  Heading anchors are double URL-encoded for non-Latin scripts (Japanese, Chinese, Korean, Cyrillic, etc.) #89
                  Open
                  Open
                  Heading anchors are double URL-encoded for non-Latin scripts (Japanese, Chinese, Korean, Cyrillic, etc.)#89
                  Description
                  @kaitohm
                  kaitohm
                  opened on Aug 17, 2026
                  Summary
                  simpletoc_sanitize_string() applies rawurlencode() to a string that sanitize_title_with_dashes() has already percent-encoded. For non-Latin headings this produces double-encoded anchors. Latin-script headings are unaffected, which could be why this has gone unnoticed.
                  Note: This is a bug I came across on my site and I had AI find the cause for me. This issue was written with the assistance of AI.
                  Steps to reproduce
                  1. On a site with SimpleTOC active, create a post with two headings:

                    • Test Heading ABC
                    • テスト見出し
                  2. Save and inspect the rendered heading id attributes.
                  Actual
                  <h2id="test-heading-abc">Test Heading ABC</h2><h2id="%25e3%2583%2586%25e3%2582%25b9%25e3%2583%2588%25e8%25a6%258b%25e5%2587%25ba%25e3%2581%2597">テスト見出し</h2>
                  Expected
                  <h2id="%e3%83%86%e3%82%b9%e3%83%88%e8%a6%8b%e5%87%ba%e3%81%97">テスト見出し</h2>
                  Cause
                  In plugin.php, simpletoc_sanitize_string():
                  $sanitized_string = sanitize_title_with_dashes( $string_without_accents );
// Encode for use in an url.$urlencoded = rawurlencode( $sanitized_string );
return$urlencoded;
                  sanitize_title_with_dashes() already calls utf8_uri_encode(), so its return value is percent-encoded for any non-ASCII input. rawurlencode() then escapes each % as %25.
                  For ASCII input the output contains no %, so rawurlencode() is a no-op — the defect cannot manifest in Latin script.
                  Suggested fix
                  Drop the rawurlencode() call; sanitize_title_with_dashes() already returns a URL-safe slug.
                  returnsanitize_title_with_dashes( $string_without_accents );
                  Impact
                  In-page TOC links still resolve, because get_included_toc_headings() and add_anchor_attribute() generate the anchor the same way. But any externally shared, hand-written, or search-indexed fragment link to a non-Latin heading will not match, and the URLs are unreadable when shared.
                  Manually set HTML anchors are unaffected — add_anchor_attribute() correctly skips headings that already have an id.
                  Environment
                  • SimpleTOC 7.1.1
                  • WordPress.com, site language ja
                  Metadata
                  Metadata
                  Assignees
                  No one assigned
                    Labels
                    No labels
                    No labels
                    Projects
                    No projects
                      Milestone
                      No milestone
                      Relationships
                      None yet
                      Development
                      No branches or pull requests
                      Issue actions
                      
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Heading anchors are double URL-encoded for non-Latin scripts (Japanese, Chinese, Korean, Cyrillic, etc.) · Issue #89 · mtoensing/simpletoc · GitHub
                      Skip to content
                      Heading anchors are double URL-encoded for non-Latin scripts (Japanese, Chinese, Korean, Cyrillic, etc.) #89
                      Open
                      Open
                      Heading anchors are double URL-encoded for non-Latin scripts (Japanese, Chinese, Korean, Cyrillic, etc.)#89
                      Description
                      @kaitohm
                      kaitohm
                      opened on Aug 17, 2026
                      Summary
                      simpletoc_sanitize_string() applies rawurlencode() to a string that sanitize_title_with_dashes() has already percent-encoded. For non-Latin headings this produces double-encoded anchors. Latin-script headings are unaffected, which could be why this has gone unnoticed.
                      Note: This is a bug I came across on my site and I had AI find the cause for me. This issue was written with the assistance of AI.
                      Steps to reproduce
                      1. On a site with SimpleTOC active, create a post with two headings:

                        • Test Heading ABC
                        • テスト見出し
                      2. Save and inspect the rendered heading id attributes.
                      Actual
                      <h2id="test-heading-abc">Test Heading ABC</h2><h2id="%25e3%2583%2586%25e3%2582%25b9%25e3%2583%2588%25e8%25a6%258b%25e5%2587%25ba%25e3%2581%2597">テスト見出し</h2>
                      Expected
                      <h2id="%e3%83%86%e3%82%b9%e3%83%88%e8%a6%8b%e5%87%ba%e3%81%97">テスト見出し</h2>
                      Cause
                      In plugin.php, simpletoc_sanitize_string():
                      $sanitized_string = sanitize_title_with_dashes( $string_without_accents );
// Encode for use in an url.$urlencoded = rawurlencode( $sanitized_string );
return$urlencoded;
                      sanitize_title_with_dashes() already calls utf8_uri_encode(), so its return value is percent-encoded for any non-ASCII input. rawurlencode() then escapes each % as %25.
                      For ASCII input the output contains no %, so rawurlencode() is a no-op — the defect cannot manifest in Latin script.
                      Suggested fix
                      Drop the rawurlencode() call; sanitize_title_with_dashes() already returns a URL-safe slug.
                      returnsanitize_title_with_dashes( $string_without_accents );
                      Impact
                      In-page TOC links still resolve, because get_included_toc_headings() and add_anchor_attribute() generate the anchor the same way. But any externally shared, hand-written, or search-indexed fragment link to a non-Latin heading will not match, and the URLs are unreadable when shared.
                      Manually set HTML anchors are unaffected — add_anchor_attribute() correctly skips headings that already have an id.
                      Environment
                      • SimpleTOC 7.1.1
                      • WordPress.com, site language ja
                      Metadata
                      Metadata
                      Assignees
                      No one assigned
                        Labels
                        No labels
                        No labels
                        Projects
                        No projects
                          Milestone
                          No milestone
                          Relationships
                          None yet
                          Development
                          No branches or pull requests
                          Issue actions
                          
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Heading anchors are double URL-encoded for non-Latin scripts (Japanese, Chinese, Korean, Cyrillic, etc.) · Issue #89 · mtoensing/simpletoc · GitHub
                          Skip to content
                          Heading anchors are double URL-encoded for non-Latin scripts (Japanese, Chinese, Korean, Cyrillic, etc.) #89
                          Open
                          Open
                          Heading anchors are double URL-encoded for non-Latin scripts (Japanese, Chinese, Korean, Cyrillic, etc.)#89
                          Description
                          @kaitohm
                          kaitohm
                          opened on Aug 17, 2026
                          Summary
                          simpletoc_sanitize_string() applies rawurlencode() to a string that sanitize_title_with_dashes() has already percent-encoded. For non-Latin headings this produces double-encoded anchors. Latin-script headings are unaffected, which could be why this has gone unnoticed.
                          Note: This is a bug I came across on my site and I had AI find the cause for me. This issue was written with the assistance of AI.
                          Steps to reproduce
                          1. On a site with SimpleTOC active, create a post with two headings:

                            • Test Heading ABC
                            • テスト見出し
                          2. Save and inspect the rendered heading id attributes.
                          Actual
                          <h2id="test-heading-abc">Test Heading ABC</h2><h2id="%25e3%2583%2586%25e3%2582%25b9%25e3%2583%2588%25e8%25a6%258b%25e5%2587%25ba%25e3%2581%2597">テスト見出し</h2>
                          Expected
                          <h2id="%e3%83%86%e3%82%b9%e3%83%88%e8%a6%8b%e5%87%ba%e3%81%97">テスト見出し</h2>
                          Cause
                          In plugin.php, simpletoc_sanitize_string():
                          $sanitized_string = sanitize_title_with_dashes( $string_without_accents );
// Encode for use in an url.$urlencoded = rawurlencode( $sanitized_string );
return$urlencoded;
                          sanitize_title_with_dashes() already calls utf8_uri_encode(), so its return value is percent-encoded for any non-ASCII input. rawurlencode() then escapes each % as %25.
                          For ASCII input the output contains no %, so rawurlencode() is a no-op — the defect cannot manifest in Latin script.
                          Suggested fix
                          Drop the rawurlencode() call; sanitize_title_with_dashes() already returns a URL-safe slug.
                          returnsanitize_title_with_dashes( $string_without_accents );
                          Impact
                          In-page TOC links still resolve, because get_included_toc_headings() and add_anchor_attribute() generate the anchor the same way. But any externally shared, hand-written, or search-indexed fragment link to a non-Latin heading will not match, and the URLs are unreadable when shared.
                          Manually set HTML anchors are unaffected — add_anchor_attribute() correctly skips headings that already have an id.
                          Environment
                          • SimpleTOC 7.1.1
                          • WordPress.com, site language ja
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                          Metadata
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
Heading anchors are double URL-encoded for non-Latin scripts (Japanese, Chinese, Korean, Cyrillic, etc.) · Issue #89 · mtoensing/simpletoc · GitHub
                              Skip to content
                              Heading anchors are double URL-encoded for non-Latin scripts (Japanese, Chinese, Korean, Cyrillic, etc.) #89
                              Open
                              Open
                              Heading anchors are double URL-encoded for non-Latin scripts (Japanese, Chinese, Korean, Cyrillic, etc.)#89
                              Description
                              @kaitohm
                              kaitohm
                              opened on Aug 17, 2026
                              Summary
                              simpletoc_sanitize_string() applies rawurlencode() to a string that sanitize_title_with_dashes() has already percent-encoded. For non-Latin headings this produces double-encoded anchors. Latin-script headings are unaffected, which could be why this has gone unnoticed.
                              Note: This is a bug I came across on my site and I had AI find the cause for me. This issue was written with the assistance of AI.
                              Steps to reproduce
                              1. On a site with SimpleTOC active, create a post with two headings:

                                • Test Heading ABC
                                • テスト見出し
                              2. Save and inspect the rendered heading id attributes.
                              Actual
                              <h2id="test-heading-abc">Test Heading ABC</h2><h2id="%25e3%2583%2586%25e3%2582%25b9%25e3%2583%2588%25e8%25a6%258b%25e5%2587%25ba%25e3%2581%2597">テスト見出し</h2>
                              Expected
                              <h2id="%e3%83%86%e3%82%b9%e3%83%88%e8%a6%8b%e5%87%ba%e3%81%97">テスト見出し</h2>
                              Cause
                              In plugin.php, simpletoc_sanitize_string():
                              $sanitized_string = sanitize_title_with_dashes( $string_without_accents );
// Encode for use in an url.$urlencoded = rawurlencode( $sanitized_string );
return$urlencoded;
                              sanitize_title_with_dashes() already calls utf8_uri_encode(), so its return value is percent-encoded for any non-ASCII input. rawurlencode() then escapes each % as %25.
                              For ASCII input the output contains no %, so rawurlencode() is a no-op — the defect cannot manifest in Latin script.
                              Suggested fix
                              Drop the rawurlencode() call; sanitize_title_with_dashes() already returns a URL-safe slug.
                              returnsanitize_title_with_dashes( $string_without_accents );
                              Impact
                              In-page TOC links still resolve, because get_included_toc_headings() and add_anchor_attribute() generate the anchor the same way. But any externally shared, hand-written, or search-indexed fragment link to a non-Latin heading will not match, and the URLs are unreadable when shared.
                              Manually set HTML anchors are unaffected — add_anchor_attribute() correctly skips headings that already have an id.
                              Environment
                              • SimpleTOC 7.1.1
                              • WordPress.com, site language ja
                              Metadata
                              Metadata
                              Assignees
                              No one assigned
                                Labels
                                No labels
                                No labels
                                Projects
                                No projects
                                  Milestone
                                  No milestone
                                  Relationships
                                  None yet
                                  Development
                                  No branches or pull requests
                                  Issue actions