diff --git a/src/Lexer.js b/src/Lexer.js
adds linetracking to marked.js v3.0.4;
add data-ln="%d" to most tags, %d is the source markdown line
--- a/src/Lexer.js
+++ b/src/Lexer.js
@@ -50,4 +50,5 @@ function mangle(text) {
 module.exports = class Lexer {
   constructor(options) {
+    this.ln = 1;  // like most editors, start couting from 1
     this.tokens = [];
     this.tokens.links = Object.create(null);
@@ -127,4 +128,15 @@ module.exports = class Lexer {
   }
 
+  set_ln(token, ln = this.ln) {
+    // assigns ln (the current line numer) to the token,
+    // then bump this.ln by the number of newlines in the contents
+    //
+    // if ln is set, also assigns the line counter to a new value
+    // (usually a backup value from before a call into a subparser
+    //  which bumped the linecounter by a subset of the newlines)
+    token.ln = ln;
+    this.ln = ln + (token.raw.match(/\n/g) || []).length;
+  }
+
   /**
    * Lexing
@@ -134,7 +146,11 @@ module.exports = class Lexer {
       src = src.replace(/^ +$/gm, '');
     }
-    let token, lastToken, cutSrc, lastParagraphClipped;
+    let token, lastToken, cutSrc, lastParagraphClipped, ln;
 
     while (src) {
+      // this.ln will be bumped by recursive calls into this func;
+      // reset the count and rely on the outermost token's raw only
+      ln = this.ln;
+
       if (this.options.extensions
         && this.options.extensions.block
@@ -142,4 +158,5 @@ module.exports = class Lexer {
           if (token = extTokenizer.call({ lexer: this }, src, tokens)) {
             src = src.substring(token.raw.length);
+            this.set_ln(token, ln);
             tokens.push(token);
             return true;
@@ -153,4 +170,5 @@ module.exports = class Lexer {
       if (token = this.tokenizer.space(src)) {
         src = src.substring(token.raw.length);
+        this.set_ln(token, ln); // is \n if not type
         if (token.type) {
           tokens.push(token);
@@ -162,4 +180,5 @@ module.exports = class Lexer {
       if (token = this.tokenizer.code(src)) {
         src = src.substring(token.raw.length);
+        this.set_ln(token, ln);
         lastToken = tokens[tokens.length - 1];
         // An indented code block cannot interrupt a paragraph.
@@ -177,4 +196,5 @@ module.exports = class Lexer {
       if (token = this.tokenizer.fences(src)) {
         src = src.substring(token.raw.length);
+        this.set_ln(token, ln);
         tokens.push(token);
         continue;
@@ -184,4 +204,5 @@ module.exports = class Lexer {
       if (token = this.tokenizer.heading(src)) {
         src = src.substring(token.raw.length);
+        this.set_ln(token, ln);
         tokens.push(token);
         continue;
@@ -191,4 +212,5 @@ module.exports = class Lexer {
       if (token = this.tokenizer.hr(src)) {
         src = src.substring(token.raw.length);
+        this.set_ln(token, ln);
         tokens.push(token);
         continue;
@@ -198,4 +220,5 @@ module.exports = class Lexer {
       if (token = this.tokenizer.blockquote(src)) {
         src = src.substring(token.raw.length);
+        this.set_ln(token, ln);
         tokens.push(token);
         continue;
@@ -205,4 +228,5 @@ module.exports = class Lexer {
       if (token = this.tokenizer.list(src)) {
         src = src.substring(token.raw.length);
+        this.set_ln(token, ln);
         tokens.push(token);
         continue;
@@ -212,4 +236,5 @@ module.exports = class Lexer {
       if (token = this.tokenizer.html(src)) {
         src = src.substring(token.raw.length);
+        this.set_ln(token, ln);
         tokens.push(token);
         continue;
@@ -219,4 +244,5 @@ module.exports = class Lexer {
       if (token = this.tokenizer.def(src)) {
         src = src.substring(token.raw.length);
+        this.set_ln(token, ln);
         lastToken = tokens[tokens.length - 1];
         if (lastToken && (lastToken.type === 'paragraph' || lastToken.type === 'text')) {
@@ -236,4 +262,5 @@ module.exports = class Lexer {
       if (token = this.tokenizer.table(src)) {
         src = src.substring(token.raw.length);
+        this.set_ln(token, ln);
         tokens.push(token);
         continue;
@@ -243,4 +270,5 @@ module.exports = class Lexer {
       if (token = this.tokenizer.lheading(src)) {
         src = src.substring(token.raw.length);
+        this.set_ln(token, ln);
         tokens.push(token);
         continue;
@@ -263,4 +291,5 @@ module.exports = class Lexer {
       }
       if (this.state.top && (token = this.tokenizer.paragraph(cutSrc))) {
+        this.set_ln(token, ln);
         lastToken = tokens[tokens.length - 1];
         if (lastParagraphClipped && lastToken.type === 'paragraph') {
@@ -280,4 +309,6 @@ module.exports = class Lexer {
       if (token = this.tokenizer.text(src)) {
         src = src.substring(token.raw.length);
+        this.set_ln(token, ln);
+        this.ln++;
         lastToken = tokens[tokens.length - 1];
         if (lastToken && lastToken.type === 'text') {
@@ -355,4 +386,5 @@ module.exports = class Lexer {
           if (token = extTokenizer.call({ lexer: this }, src, tokens)) {
             src = src.substring(token.raw.length);
+            this.ln = token.ln || this.ln;
             tokens.push(token);
             return true;
@@ -420,4 +452,6 @@ module.exports = class Lexer {
       if (token = this.tokenizer.br(src)) {
         src = src.substring(token.raw.length);
+        // no need to reset (no more blockTokens anyways)
+        token.ln = this.ln++;
         tokens.push(token);
         continue;
@@ -462,4 +496,5 @@ module.exports = class Lexer {
       if (token = this.tokenizer.inlineText(cutSrc, smartypants)) {
         src = src.substring(token.raw.length);
+        this.ln = token.ln || this.ln;
         if (token.raw.slice(-1) !== '_') { // Track prevChar before string of ____ started
           prevChar = token.raw.slice(-1);
diff --git a/src/Parser.js b/src/Parser.js
--- a/src/Parser.js
+++ b/src/Parser.js
@@ -18,4 +18,5 @@ module.exports = class Parser {
     this.textRenderer = new TextRenderer();
     this.slugger = new Slugger();
+    this.ln = 0; // error indicator; should always be set >=1 from tokens
   }
 
@@ -64,4 +65,8 @@ module.exports = class Parser {
     for (i = 0; i < l; i++) {
       token = tokens[i];
+      // take line-numbers from tokens whenever possible
+      // and update the renderer's html attribute with the new value
+      this.ln = token.ln || this.ln;
+      this.renderer.tag_ln(this.ln);
 
       // Run any renderer extensions
@@ -124,7 +129,10 @@ module.exports = class Parser {
             }
 
-            body += this.renderer.tablerow(cell);
+            // the +2 is to skip the table header
+            body += this.renderer.tag_ln(token.ln + j + 2).tablerow(cell);
           }
-          out += this.renderer.table(header, body);
+          // the html attribute is now at the end of the table,
+          // reset it before writing the <table> tag now
+          out += this.renderer.tag_ln(token.ln).table(header, body);
           continue;
         }
@@ -167,8 +175,12 @@ module.exports = class Parser {
 
             itemBody += this.parse(item.tokens, loose);
-            body += this.renderer.listitem(itemBody, task, checked);
+            // similar to tables, writing contents before the <ul> tag
+            // so update the tag attribute as we go
+            // (assuming all list entries got tagged with a source-line, probably safe w)
+            body += this.renderer.tag_ln((item.tokens[0] || token).ln).listitem(itemBody, task, checked);
           }
 
-          out += this.renderer.list(body, ordered, start);
+          // then reset to the <ul>'s correct line number and write it
+          out += this.renderer.tag_ln(token.ln).list(body, ordered, start);
           continue;
         }
@@ -179,5 +191,6 @@ module.exports = class Parser {
         }
         case 'paragraph': {
-          out += this.renderer.paragraph(this.parseInline(token.tokens));
+          let t = this.parseInline(token.tokens);
+          out += this.renderer.tag_ln(token.ln).paragraph(t);
           continue;
         }
@@ -221,4 +234,7 @@ module.exports = class Parser {
       token = tokens[i];
 
+      // another thing that only affects <br/> and other inlines
+      this.ln = token.ln || this.ln;
+
       // Run any renderer extensions
       if (this.options.extensions && this.options.extensions.renderers && this.options.extensions.renderers[token.type]) {
diff --git a/src/Renderer.js b/src/Renderer.js
--- a/src/Renderer.js
+++ b/src/Renderer.js
@@ -11,6 +11,12 @@ module.exports = class Renderer {
   constructor(options) {
     this.options = options || defaults;
+    this.ln = "";
   }
 
+  tag_ln(n) {
+    this.ln = ' data-ln="' + n + '"';
+    return this;
+  };
+  
   code(code, infostring, escaped) {
     const lang = (infostring || '').match(/\S*/)[0];
@@ -26,10 +32,10 @@ module.exports = class Renderer {
 
     if (!lang) {
-      return '<pre><code>'
+      return '<pre' + this.ln + '><code>'
         + (escaped ? code : escape(code, true))
         + '</code></pre>\n';
     }
 
-    return '<pre><code class="'
+    return '<pre' + this.ln + '><code class="'
       + this.options.langPrefix
       + escape(lang, true)
@@ -40,5 +46,5 @@ module.exports = class Renderer {
 
   blockquote(quote) {
-    return '<blockquote>\n' + quote + '</blockquote>\n';
+    return '<blockquote' + this.ln + '>\n' + quote + '</blockquote>\n';
   }
 
@@ -51,4 +57,5 @@ module.exports = class Renderer {
       return '<h'
         + level
+        + this.ln
         + ' id="'
         + this.options.headerPrefix
@@ -61,5 +68,5 @@ module.exports = class Renderer {
     }
     // ignore IDs
-    return '<h' + level + '>' + text + '</h' + level + '>\n';
+    return '<h' + level + this.ln + '>' + text + '</h' + level + '>\n';
   }
 
@@ -75,5 +82,5 @@ module.exports = class Renderer {
 
   listitem(text) {
-    return '<li>' + text + '</li>\n';
+    return '<li' + this.ln + '>' + text + '</li>\n';
   }
 
@@ -87,5 +94,5 @@ module.exports = class Renderer {
 
   paragraph(text) {
-    return '<p>' + text + '</p>\n';
+    return '<p' + this.ln + '>' + text + '</p>\n';
   }
 
@@ -102,5 +109,5 @@ module.exports = class Renderer {
 
   tablerow(content) {
-    return '<tr>\n' + content + '</tr>\n';
+    return '<tr' + this.ln + '>\n' + content + '</tr>\n';
   }
 
@@ -127,5 +134,5 @@ module.exports = class Renderer {
 
   br() {
-    return this.options.xhtml ? '<br/>' : '<br>';
+    return this.options.xhtml ? '<br' + this.ln + '/>' : '<br' + this.ln + '>';
   }
 
@@ -153,5 +160,5 @@ module.exports = class Renderer {
     }
 
-    let out = '<img src="' + href + '" alt="' + text + '"';
+    let out = '<img' + this.ln + ' src="' + href + '" alt="' + text + '"';
     if (title) {
       out += ' title="' + title + '"';
diff --git a/src/Tokenizer.js b/src/Tokenizer.js
--- a/src/Tokenizer.js
+++ b/src/Tokenizer.js
@@ -301,4 +301,7 @@ module.exports = class Tokenizer {
       const l = list.items.length;
 
+      // each nested list gets +1 ahead; this hack makes every listgroup -1 but atleast it doesn't get infinitely bad
+      this.lexer.ln--;
+
       // Item child tokens handled here at end because we needed to have the final item to trim it first
       for (i = 0; i < l; i++) {