diff --git a/.github/workflows/stack.yml b/.github/workflows/stack.yml
new file mode 100644
index 0000000..e29e121
--- /dev/null
+++ b/.github/workflows/stack.yml
@@ -0,0 +1,12 @@
+on: [push, pull_request]
+
+name: build
+
+jobs:
+  haskell:
+    name: Build and test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - run: stack build
+      - run: stack test
diff --git a/.gitignore b/.gitignore
index 01e585a..cd13951 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,4 @@ cabal-dev
 .cabal-sandbox/
 cabal.sandbox.config
 cabal.config
+stack.yaml.lock
diff --git a/cbits/cmark-gfm-core-extensions.h b/cbits/cmark-gfm-core-extensions.h
index 8ab049d..0645915 100644
--- a/cbits/cmark-gfm-core-extensions.h
+++ b/cbits/cmark-gfm-core-extensions.h
@@ -7,6 +7,7 @@ extern "C" {
 
 #include "cmark-gfm-extension_api.h"
 #include "cmark-gfm-extensions_export.h"
+#include "config.h" // for bool
 #include <stdint.h>
 
 CMARK_GFM_EXTENSIONS_EXPORT
@@ -15,14 +16,36 @@ void cmark_gfm_core_extensions_ensure_registered(void);
 CMARK_GFM_EXTENSIONS_EXPORT
 uint16_t cmark_gfm_extensions_get_table_columns(cmark_node *node);
 
+/** Sets the number of columns for the table, returning 1 on success and 0 on error.
+ */
+CMARK_GFM_EXTENSIONS_EXPORT
+int cmark_gfm_extensions_set_table_columns(cmark_node *node, uint16_t n_columns);
+
 CMARK_GFM_EXTENSIONS_EXPORT
 uint8_t *cmark_gfm_extensions_get_table_alignments(cmark_node *node);
 
+/** Sets the alignments for the table, returning 1 on success and 0 on error.
+ */
+CMARK_GFM_EXTENSIONS_EXPORT
+int cmark_gfm_extensions_set_table_alignments(cmark_node *node, uint16_t ncols, uint8_t *alignments);
+
 CMARK_GFM_EXTENSIONS_EXPORT
 int cmark_gfm_extensions_get_table_row_is_header(cmark_node *node);
 
+/** Sets whether the node is a table header row, returning 1 on success and 0 on error.
+ */
+CMARK_GFM_EXTENSIONS_EXPORT
+int cmark_gfm_extensions_set_table_row_is_header(cmark_node *node, int is_header);
+
+CMARK_GFM_EXTENSIONS_EXPORT
+bool cmark_gfm_extensions_get_tasklist_item_checked(cmark_node *node);
+/* For backwards compatibility */
+#define cmark_gfm_extensions_tasklist_is_checked cmark_gfm_extensions_get_tasklist_item_checked
+
+/** Sets whether a tasklist item is "checked" (completed), returning 1 on success and 0 on error.
+ */
 CMARK_GFM_EXTENSIONS_EXPORT
-char *cmark_gfm_extensions_get_tasklist_state(cmark_node *node);
+int cmark_gfm_extensions_set_tasklist_item_checked(cmark_node *node, bool is_checked);
 
 #ifdef __cplusplus
 }
diff --git a/cbits/ext_scanners.c b/cbits/ext_scanners.c
index c3de227..0d3ba28 100644
--- a/cbits/ext_scanners.c
+++ b/cbits/ext_scanners.c
@@ -1,4 +1,5 @@
-/* Generated by re2c 1.1.1 */
+/* Generated by re2c 1.3 */
+
 #include "ext_scanners.h"
 #include <stdlib.h>
 
@@ -39,265 +40,180 @@ bufsize_t _scan_table_start(const unsigned char *p) {
         0, 0,   0, 0, 0, 0, 0, 0, 0, 0,  0,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0,
         0, 0,   0, 0, 0, 0, 0, 0, 0, 0,  0,  0,  0,  0,
     };
-    yych = *(marker = p);
-    if (yych <= '{') {
-      if (yych <= 0x1F) {
-        if (yych <= '\t') {
-          if (yych <= 0x08)
-            goto yy3;
+    yych = *p;
+    if (yych <= ' ') {
+      if (yych <= '\n') {
+        if (yych == '\t')
           goto yy4;
-        } else {
-          if (yych <= '\n')
-            goto yy2;
-          if (yych <= '\f')
-            goto yy4;
-          goto yy3;
-        }
       } else {
-        if (yych <= '-') {
-          if (yych <= ' ')
-            goto yy4;
-          if (yych <= ',')
-            goto yy3;
-          goto yy5;
-        } else {
-          if (yych == ':')
-            goto yy6;
-          goto yy3;
-        }
+        if (yych <= '\f')
+          goto yy4;
+        if (yych >= ' ')
+          goto yy4;
       }
     } else {
-      if (yych <= 0xEC) {
-        if (yych <= 0xC1) {
-          if (yych <= '|')
-            goto yy4;
-          if (yych <= 0x7F)
-            goto yy3;
-        } else {
-          if (yych <= 0xDF)
-            goto yy7;
-          if (yych <= 0xE0)
-            goto yy9;
-          goto yy10;
-        }
+      if (yych <= '9') {
+        if (yych == '-')
+          goto yy5;
       } else {
-        if (yych <= 0xF0) {
-          if (yych <= 0xED)
-            goto yy11;
-          if (yych <= 0xEF)
-            goto yy10;
-          goto yy12;
-        } else {
-          if (yych <= 0xF3)
-            goto yy13;
-          if (yych <= 0xF4)
-            goto yy14;
-        }
+        if (yych <= ':')
+          goto yy6;
+        if (yych == '|')
+          goto yy4;
       }
     }
-  yy2 : { return 0; }
-  yy3:
     ++p;
-    goto yy2;
+  yy3 : { return 0; }
   yy4:
     yych = *(marker = ++p);
     if (yybm[0 + yych] & 64) {
-      goto yy15;
+      goto yy7;
     }
     if (yych == '-')
-      goto yy17;
+      goto yy10;
     if (yych == ':')
-      goto yy19;
-    goto yy2;
+      goto yy12;
+    goto yy3;
   yy5:
     yych = *(marker = ++p);
     if (yybm[0 + yych] & 128) {
-      goto yy17;
+      goto yy10;
     }
     if (yych <= ' ') {
       if (yych <= 0x08)
-        goto yy2;
+        goto yy3;
       if (yych <= '\r')
-        goto yy21;
+        goto yy14;
       if (yych <= 0x1F)
-        goto yy2;
-      goto yy21;
+        goto yy3;
+      goto yy14;
     } else {
       if (yych <= ':') {
         if (yych <= '9')
-          goto yy2;
-        goto yy20;
+          goto yy3;
+        goto yy13;
       } else {
         if (yych == '|')
-          goto yy21;
-        goto yy2;
+          goto yy14;
+        goto yy3;
       }
     }
   yy6:
     yych = *(marker = ++p);
     if (yybm[0 + yych] & 128) {
-      goto yy17;
+      goto yy10;
     }
-    goto yy2;
+    goto yy3;
   yy7:
-    yych = *++p;
-    if (yych <= 0x7F)
-      goto yy8;
-    if (yych <= 0xBF)
-      goto yy3;
-  yy8:
-    p = marker;
-    goto yy2;
-  yy9:
-    yych = *++p;
-    if (yych <= 0x9F)
-      goto yy8;
-    if (yych <= 0xBF)
-      goto yy7;
-    goto yy8;
-  yy10:
-    yych = *++p;
-    if (yych <= 0x7F)
-      goto yy8;
-    if (yych <= 0xBF)
-      goto yy7;
-    goto yy8;
-  yy11:
-    yych = *++p;
-    if (yych <= 0x7F)
-      goto yy8;
-    if (yych <= 0x9F)
-      goto yy7;
-    goto yy8;
-  yy12:
-    yych = *++p;
-    if (yych <= 0x8F)
-      goto yy8;
-    if (yych <= 0xBF)
-      goto yy10;
-    goto yy8;
-  yy13:
-    yych = *++p;
-    if (yych <= 0x7F)
-      goto yy8;
-    if (yych <= 0xBF)
-      goto yy10;
-    goto yy8;
-  yy14:
-    yych = *++p;
-    if (yych <= 0x7F)
-      goto yy8;
-    if (yych <= 0x8F)
-      goto yy10;
-    goto yy8;
-  yy15:
     yych = *++p;
     if (yybm[0 + yych] & 64) {
-      goto yy15;
+      goto yy7;
     }
     if (yych == '-')
-      goto yy17;
+      goto yy10;
     if (yych == ':')
-      goto yy19;
-    goto yy8;
-  yy17:
+      goto yy12;
+  yy9:
+    p = marker;
+    goto yy3;
+  yy10:
     yych = *++p;
     if (yybm[0 + yych] & 128) {
-      goto yy17;
+      goto yy10;
     }
     if (yych <= 0x1F) {
       if (yych <= '\n') {
         if (yych <= 0x08)
-          goto yy8;
+          goto yy9;
         if (yych <= '\t')
-          goto yy20;
-        goto yy22;
+          goto yy13;
+        goto yy15;
       } else {
         if (yych <= '\f')
-          goto yy20;
+          goto yy13;
         if (yych <= '\r')
-          goto yy24;
-        goto yy8;
+          goto yy17;
+        goto yy9;
       }
     } else {
       if (yych <= ':') {
         if (yych <= ' ')
-          goto yy20;
+          goto yy13;
         if (yych <= '9')
-          goto yy8;
-        goto yy20;
+          goto yy9;
+        goto yy13;
       } else {
         if (yych == '|')
-          goto yy25;
-        goto yy8;
+          goto yy18;
+        goto yy9;
       }
     }
-  yy19:
+  yy12:
     yych = *++p;
     if (yybm[0 + yych] & 128) {
-      goto yy17;
+      goto yy10;
     }
-    goto yy8;
-  yy20:
+    goto yy9;
+  yy13:
     yych = *++p;
-  yy21:
+  yy14:
     if (yych <= '\r') {
       if (yych <= '\t') {
         if (yych <= 0x08)
-          goto yy8;
-        goto yy20;
+          goto yy9;
+        goto yy13;
       } else {
         if (yych <= '\n')
-          goto yy22;
+          goto yy15;
         if (yych <= '\f')
-          goto yy20;
-        goto yy24;
+          goto yy13;
+        goto yy17;
       }
     } else {
       if (yych <= ' ') {
         if (yych <= 0x1F)
-          goto yy8;
-        goto yy20;
+          goto yy9;
+        goto yy13;
       } else {
         if (yych == '|')
-          goto yy25;
-        goto yy8;
+          goto yy18;
+        goto yy9;
       }
     }
-  yy22:
+  yy15:
     ++p;
     { return (bufsize_t)(p - start); }
-  yy24:
+  yy17:
     yych = *++p;
     if (yych == '\n')
-      goto yy22;
-    goto yy8;
-  yy25:
+      goto yy15;
+    goto yy9;
+  yy18:
     yych = *++p;
     if (yybm[0 + yych] & 128) {
-      goto yy17;
+      goto yy10;
     }
     if (yych <= '\r') {
       if (yych <= '\t') {
         if (yych <= 0x08)
-          goto yy8;
-        goto yy25;
+          goto yy9;
+        goto yy18;
       } else {
         if (yych <= '\n')
-          goto yy22;
+          goto yy15;
         if (yych <= '\f')
-          goto yy25;
-        goto yy24;
+          goto yy18;
+        goto yy17;
       }
     } else {
       if (yych <= ' ') {
         if (yych <= 0x1F)
-          goto yy8;
-        goto yy25;
+          goto yy9;
+        goto yy18;
       } else {
         if (yych == ':')
-          goto yy19;
-        goto yy8;
+          goto yy12;
+        goto yy9;
       }
     }
   }
@@ -309,6 +225,7 @@ bufsize_t _scan_table_cell(const unsigned char *p) {
 
   {
     unsigned char yych;
+    unsigned int yyaccept = 0;
     static const unsigned char yybm[] = {
         64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 0,  64, 64, 0,  64, 64, 64, 64,
         64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
@@ -326,53 +243,51 @@ bufsize_t _scan_table_cell(const unsigned char *p) {
         0,  0,  0,   0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
         0,  0,  0,   0,
     };
-    yych = *(marker = p);
+    yych = *p;
     if (yybm[0 + yych] & 64) {
-      goto yy30;
+      goto yy22;
     }
-    if (yych <= 0xE0) {
-      if (yych <= '\\') {
-        if (yych <= '\n')
-          goto yy29;
+    if (yych <= 0xEC) {
+      if (yych <= 0xC1) {
         if (yych <= '\r')
-          goto yy32;
-        goto yy34;
+          goto yy25;
+        if (yych <= '\\')
+          goto yy27;
+        goto yy25;
       } else {
-        if (yych <= '|')
-          goto yy32;
-        if (yych <= 0xC1)
-          goto yy29;
         if (yych <= 0xDF)
-          goto yy36;
-        goto yy38;
+          goto yy29;
+        if (yych <= 0xE0)
+          goto yy30;
+        goto yy31;
       }
     } else {
-      if (yych <= 0xEF) {
-        if (yych == 0xED)
-          goto yy40;
-        goto yy39;
+      if (yych <= 0xF0) {
+        if (yych <= 0xED)
+          goto yy32;
+        if (yych <= 0xEF)
+          goto yy31;
+        goto yy33;
       } else {
-        if (yych <= 0xF0)
-          goto yy41;
         if (yych <= 0xF3)
-          goto yy42;
+          goto yy34;
         if (yych <= 0xF4)
-          goto yy43;
+          goto yy35;
+        goto yy25;
       }
     }
-  yy29 : { return (bufsize_t)(p - start); }
-  yy30:
+  yy22:
+    yyaccept = 0;
     yych = *(marker = ++p);
     if (yybm[0 + yych] & 64) {
-      goto yy30;
+      goto yy22;
     }
     if (yych <= 0xEC) {
       if (yych <= 0xC1) {
         if (yych <= '\r')
-          goto yy29;
+          goto yy24;
         if (yych <= '\\')
-          goto yy34;
-        goto yy29;
+          goto yy27;
       } else {
         if (yych <= 0xDF)
           goto yy36;
@@ -392,29 +307,31 @@ bufsize_t _scan_table_cell(const unsigned char *p) {
           goto yy42;
         if (yych <= 0xF4)
           goto yy43;
-        goto yy29;
       }
     }
-  yy32:
+  yy24 : { return (bufsize_t)(p - start); }
+  yy25:
     ++p;
-    { return 0; }
-  yy34:
+  yy26 : { return 0; }
+  yy27:
+    yyaccept = 0;
     yych = *(marker = ++p);
     if (yybm[0 + yych] & 128) {
-      goto yy34;
+      goto yy27;
     }
     if (yych <= 0xDF) {
       if (yych <= '\f') {
         if (yych == '\n')
-          goto yy29;
-        goto yy30;
+          goto yy24;
+        goto yy22;
       } else {
         if (yych <= '\r')
-          goto yy29;
+          goto yy24;
         if (yych <= 0x7F)
-          goto yy30;
+          goto yy22;
         if (yych <= 0xC1)
-          goto yy29;
+          goto yy24;
+        goto yy36;
       }
     } else {
       if (yych <= 0xEF) {
@@ -430,18 +347,77 @@ bufsize_t _scan_table_cell(const unsigned char *p) {
           goto yy42;
         if (yych <= 0xF4)
           goto yy43;
-        goto yy29;
+        goto yy24;
       }
     }
+  yy29:
+    yych = *++p;
+    if (yych <= 0x7F)
+      goto yy26;
+    if (yych <= 0xBF)
+      goto yy22;
+    goto yy26;
+  yy30:
+    yyaccept = 1;
+    yych = *(marker = ++p);
+    if (yych <= 0x9F)
+      goto yy26;
+    if (yych <= 0xBF)
+      goto yy36;
+    goto yy26;
+  yy31:
+    yyaccept = 1;
+    yych = *(marker = ++p);
+    if (yych <= 0x7F)
+      goto yy26;
+    if (yych <= 0xBF)
+      goto yy36;
+    goto yy26;
+  yy32:
+    yyaccept = 1;
+    yych = *(marker = ++p);
+    if (yych <= 0x7F)
+      goto yy26;
+    if (yych <= 0x9F)
+      goto yy36;
+    goto yy26;
+  yy33:
+    yyaccept = 1;
+    yych = *(marker = ++p);
+    if (yych <= 0x8F)
+      goto yy26;
+    if (yych <= 0xBF)
+      goto yy39;
+    goto yy26;
+  yy34:
+    yyaccept = 1;
+    yych = *(marker = ++p);
+    if (yych <= 0x7F)
+      goto yy26;
+    if (yych <= 0xBF)
+      goto yy39;
+    goto yy26;
+  yy35:
+    yyaccept = 1;
+    yych = *(marker = ++p);
+    if (yych <= 0x7F)
+      goto yy26;
+    if (yych <= 0x8F)
+      goto yy39;
+    goto yy26;
   yy36:
     yych = *++p;
     if (yych <= 0x7F)
       goto yy37;
     if (yych <= 0xBF)
-      goto yy30;
+      goto yy22;
   yy37:
     p = marker;
-    goto yy29;
+    if (yyaccept == 0) {
+      goto yy24;
+    } else {
+      goto yy26;
+    }
   yy38:
     yych = *++p;
     if (yych <= 0x9F)
@@ -488,12 +464,10 @@ bufsize_t _scan_table_cell(const unsigned char *p) {
 }
 
 bufsize_t _scan_table_cell_end(const unsigned char *p) {
-  const unsigned char *marker = NULL;
   const unsigned char *start = p;
 
   {
     unsigned char yych;
-    unsigned int yyaccept = 0;
     static const unsigned char yybm[] = {
         0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 0, 128, 128, 0, 0, 0, 0, 0, 0, 0,
         0, 0, 0, 0, 0, 0, 0, 0, 0, 0,   0, 0,   128, 0, 0, 0, 0, 0, 0, 0,
@@ -509,115 +483,17 @@ bufsize_t _scan_table_cell_end(const unsigned char *p) {
         0, 0, 0, 0, 0, 0, 0, 0, 0, 0,   0, 0,   0,   0, 0, 0, 0, 0, 0, 0,
         0, 0, 0, 0, 0, 0, 0, 0, 0, 0,   0, 0,   0,   0, 0, 0,
     };
-    yych = *(marker = p);
-    if (yych <= 0xDF) {
-      if (yych <= '{') {
-        if (yych != '\n')
-          goto yy47;
-      } else {
-        if (yych <= '|')
-          goto yy48;
-        if (yych <= 0x7F)
-          goto yy47;
-        if (yych >= 0xC2)
-          goto yy51;
-      }
-    } else {
-      if (yych <= 0xEF) {
-        if (yych <= 0xE0)
-          goto yy53;
-        if (yych == 0xED)
-          goto yy55;
-        goto yy54;
-      } else {
-        if (yych <= 0xF0)
-          goto yy56;
-        if (yych <= 0xF3)
-          goto yy57;
-        if (yych <= 0xF4)
-          goto yy58;
-      }
-    }
-  yy46 : { return 0; }
-  yy47:
+    yych = *p;
+    if (yych == '|')
+      goto yy48;
     ++p;
-    goto yy46;
+    { return 0; }
   yy48:
-    yyaccept = 1;
-    yych = *(marker = ++p);
+    yych = *++p;
     if (yybm[0 + yych] & 128) {
       goto yy48;
     }
-    if (yych <= 0x08)
-      goto yy50;
-    if (yych <= '\n')
-      goto yy59;
-    if (yych <= '\r')
-      goto yy60;
-  yy50 : { return (bufsize_t)(p - start); }
-  yy51:
-    yych = *++p;
-    if (yych <= 0x7F)
-      goto yy52;
-    if (yych <= 0xBF)
-      goto yy47;
-  yy52:
-    p = marker;
-    if (yyaccept == 0) {
-      goto yy46;
-    } else {
-      goto yy50;
-    }
-  yy53:
-    yych = *++p;
-    if (yych <= 0x9F)
-      goto yy52;
-    if (yych <= 0xBF)
-      goto yy51;
-    goto yy52;
-  yy54:
-    yych = *++p;
-    if (yych <= 0x7F)
-      goto yy52;
-    if (yych <= 0xBF)
-      goto yy51;
-    goto yy52;
-  yy55:
-    yych = *++p;
-    if (yych <= 0x7F)
-      goto yy52;
-    if (yych <= 0x9F)
-      goto yy51;
-    goto yy52;
-  yy56:
-    yych = *++p;
-    if (yych <= 0x8F)
-      goto yy52;
-    if (yych <= 0xBF)
-      goto yy54;
-    goto yy52;
-  yy57:
-    yych = *++p;
-    if (yych <= 0x7F)
-      goto yy52;
-    if (yych <= 0xBF)
-      goto yy54;
-    goto yy52;
-  yy58:
-    yych = *++p;
-    if (yych <= 0x7F)
-      goto yy52;
-    if (yych <= 0x8F)
-      goto yy54;
-    goto yy52;
-  yy59:
-    ++p;
-    goto yy50;
-  yy60:
-    yych = *++p;
-    if (yych == '\n')
-      goto yy59;
-    goto yy52;
+    { return (bufsize_t)(p - start); }
   }
 }
 
@@ -642,138 +518,62 @@ bufsize_t _scan_table_row_end(const unsigned char *p) {
         0, 0, 0, 0, 0, 0, 0, 0, 0, 0,   0, 0,   0,   0, 0, 0, 0, 0, 0, 0,
         0, 0, 0, 0, 0, 0, 0, 0, 0, 0,   0, 0,   0,   0, 0, 0,
     };
-    yych = *(marker = p);
-    if (yych <= 0xC1) {
-      if (yych <= '\f') {
-        if (yych <= 0x08)
-          goto yy64;
-        if (yych == '\n')
-          goto yy66;
-        goto yy65;
-      } else {
-        if (yych <= 0x1F) {
-          if (yych <= '\r')
-            goto yy68;
-          goto yy64;
-        } else {
-          if (yych <= ' ')
-            goto yy65;
-          if (yych <= 0x7F)
-            goto yy64;
-        }
-      }
+    yych = *p;
+    if (yych <= '\f') {
+      if (yych <= 0x08)
+        goto yy53;
+      if (yych == '\n')
+        goto yy56;
+      goto yy55;
     } else {
-      if (yych <= 0xED) {
-        if (yych <= 0xDF)
-          goto yy69;
-        if (yych <= 0xE0)
-          goto yy71;
-        if (yych <= 0xEC)
-          goto yy72;
-        goto yy73;
-      } else {
-        if (yych <= 0xF0) {
-          if (yych <= 0xEF)
-            goto yy72;
-          goto yy74;
-        } else {
-          if (yych <= 0xF3)
-            goto yy75;
-          if (yych <= 0xF4)
-            goto yy76;
-        }
-      }
+      if (yych <= '\r')
+        goto yy58;
+      if (yych == ' ')
+        goto yy55;
     }
-  yy63 : { return 0; }
-  yy64:
+  yy53:
     ++p;
-    goto yy63;
-  yy65:
+  yy54 : { return 0; }
+  yy55:
     yych = *(marker = ++p);
     if (yych <= 0x08)
-      goto yy63;
+      goto yy54;
     if (yych <= '\r')
-      goto yy78;
+      goto yy60;
     if (yych == ' ')
-      goto yy78;
-    goto yy63;
-  yy66:
+      goto yy60;
+    goto yy54;
+  yy56:
     ++p;
     { return (bufsize_t)(p - start); }
-  yy68:
+  yy58:
     yych = *++p;
     if (yych == '\n')
-      goto yy66;
-    goto yy63;
-  yy69:
-    yych = *++p;
-    if (yych <= 0x7F)
-      goto yy70;
-    if (yych <= 0xBF)
-      goto yy64;
-  yy70:
-    p = marker;
-    goto yy63;
-  yy71:
-    yych = *++p;
-    if (yych <= 0x9F)
-      goto yy70;
-    if (yych <= 0xBF)
-      goto yy69;
-    goto yy70;
-  yy72:
-    yych = *++p;
-    if (yych <= 0x7F)
-      goto yy70;
-    if (yych <= 0xBF)
-      goto yy69;
-    goto yy70;
-  yy73:
-    yych = *++p;
-    if (yych <= 0x7F)
-      goto yy70;
-    if (yych <= 0x9F)
-      goto yy69;
-    goto yy70;
-  yy74:
-    yych = *++p;
-    if (yych <= 0x8F)
-      goto yy70;
-    if (yych <= 0xBF)
-      goto yy72;
-    goto yy70;
-  yy75:
-    yych = *++p;
-    if (yych <= 0x7F)
-      goto yy70;
-    if (yych <= 0xBF)
-      goto yy72;
-    goto yy70;
-  yy76:
-    yych = *++p;
-    if (yych <= 0x7F)
-      goto yy70;
-    if (yych <= 0x8F)
-      goto yy72;
-    goto yy70;
-  yy77:
+      goto yy56;
+    goto yy54;
+  yy59:
     yych = *++p;
-  yy78:
+  yy60:
     if (yybm[0 + yych] & 128) {
-      goto yy77;
+      goto yy59;
     }
     if (yych <= 0x08)
-      goto yy70;
+      goto yy61;
     if (yych <= '\n')
-      goto yy66;
-    if (yych >= 0x0E)
-      goto yy70;
+      goto yy56;
+    if (yych <= '\r')
+      goto yy62;
+  yy61:
+    p = marker;
+    goto yy54;
+  yy62:
     yych = *++p;
     if (yych == '\n')
-      goto yy66;
-    goto yy70;
+      goto yy56;
+    goto yy61;
   }
 }
+
 bufsize_t _scan_tasklist(const unsigned char *p) {
   const unsigned char *marker = NULL;
   const unsigned char *start = p;
@@ -798,361 +598,281 @@ bufsize_t _scan_tasklist(const unsigned char *p) {
         0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0, 0,  0,  0, 0, 0,
         0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0, 0,  0,  0, 0, 0,
     };
-    yych = *(marker = p);
-    if (yych <= '/') {
-      if (yych <= 0x1F) {
-        if (yych <= '\t') {
-          if (yych <= 0x08)
-            goto yy83;
-          goto yy84;
-        } else {
-          if (yych <= '\n')
-            goto yy82;
-          if (yych <= '\f')
-            goto yy84;
-          goto yy83;
-        }
+    yych = *p;
+    if (yych <= ' ') {
+      if (yych <= '\n') {
+        if (yych == '\t')
+          goto yy67;
       } else {
-        if (yych <= '+') {
-          if (yych <= ' ')
-            goto yy84;
-          if (yych <= ')')
-            goto yy83;
-          goto yy85;
-        } else {
-          if (yych == '-')
-            goto yy85;
-          goto yy83;
-        }
+        if (yych <= '\f')
+          goto yy67;
+        if (yych >= ' ')
+          goto yy67;
       }
     } else {
-      if (yych <= 0xEC) {
-        if (yych <= 0xC1) {
-          if (yych <= '9')
-            goto yy86;
-          if (yych <= 0x7F)
-            goto yy83;
-        } else {
-          if (yych <= 0xDF)
-            goto yy87;
-          if (yych <= 0xE0)
-            goto yy89;
-          goto yy90;
-        }
+      if (yych <= ',') {
+        if (yych <= ')')
+          goto yy65;
+        if (yych <= '+')
+          goto yy68;
       } else {
-        if (yych <= 0xF0) {
-          if (yych <= 0xED)
-            goto yy91;
-          if (yych <= 0xEF)
-            goto yy90;
-          goto yy92;
-        } else {
-          if (yych <= 0xF3)
-            goto yy93;
-          if (yych <= 0xF4)
-            goto yy94;
-        }
+        if (yych <= '-')
+          goto yy68;
+        if (yych <= '/')
+          goto yy65;
+        if (yych <= '9')
+          goto yy69;
       }
     }
-  yy82 : { return 0; }
-  yy83:
+  yy65:
     ++p;
-    goto yy82;
-  yy84:
+  yy66 : { return 0; }
+  yy67:
     yych = *(marker = ++p);
     if (yybm[0 + yych] & 64) {
-      goto yy95;
+      goto yy70;
     }
     if (yych <= ',') {
       if (yych <= ')')
-        goto yy82;
+        goto yy66;
       if (yych <= '+')
-        goto yy97;
-      goto yy82;
+        goto yy73;
+      goto yy66;
     } else {
       if (yych <= '-')
-        goto yy97;
+        goto yy73;
       if (yych <= '/')
-        goto yy82;
+        goto yy66;
       if (yych <= '9')
-        goto yy98;
-      goto yy82;
+        goto yy74;
+      goto yy66;
     }
-  yy85:
+  yy68:
     yych = *(marker = ++p);
     if (yych <= '\n') {
       if (yych == '\t')
-        goto yy99;
-      goto yy82;
+        goto yy75;
+      goto yy66;
     } else {
       if (yych <= '\f')
-        goto yy99;
+        goto yy75;
       if (yych == ' ')
-        goto yy99;
-      goto yy82;
+        goto yy75;
+      goto yy66;
     }
-  yy86:
+  yy69:
     yych = *(marker = ++p);
     if (yych <= 0x1F) {
       if (yych <= '\t') {
         if (yych <= 0x08)
-          goto yy102;
-        goto yy97;
+          goto yy78;
+        goto yy73;
       } else {
         if (yych <= '\n')
-          goto yy82;
+          goto yy66;
         if (yych <= '\f')
-          goto yy97;
-        goto yy102;
+          goto yy73;
+        goto yy78;
       }
     } else {
       if (yych <= 0x7F) {
         if (yych <= ' ')
-          goto yy97;
-        goto yy102;
+          goto yy73;
+        goto yy78;
       } else {
         if (yych <= 0xC1)
-          goto yy82;
+          goto yy66;
         if (yych <= 0xF4)
-          goto yy102;
-        goto yy82;
+          goto yy78;
+        goto yy66;
       }
     }
-  yy87:
-    yych = *++p;
-    if (yych <= 0x7F)
-      goto yy88;
-    if (yych <= 0xBF)
-      goto yy83;
-  yy88:
-    p = marker;
-    goto yy82;
-  yy89:
-    yych = *++p;
-    if (yych <= 0x9F)
-      goto yy88;
-    if (yych <= 0xBF)
-      goto yy87;
-    goto yy88;
-  yy90:
-    yych = *++p;
-    if (yych <= 0x7F)
-      goto yy88;
-    if (yych <= 0xBF)
-      goto yy87;
-    goto yy88;
-  yy91:
-    yych = *++p;
-    if (yych <= 0x7F)
-      goto yy88;
-    if (yych <= 0x9F)
-      goto yy87;
-    goto yy88;
-  yy92:
-    yych = *++p;
-    if (yych <= 0x8F)
-      goto yy88;
-    if (yych <= 0xBF)
-      goto yy90;
-    goto yy88;
-  yy93:
-    yych = *++p;
-    if (yych <= 0x7F)
-      goto yy88;
-    if (yych <= 0xBF)
-      goto yy90;
-    goto yy88;
-  yy94:
-    yych = *++p;
-    if (yych <= 0x7F)
-      goto yy88;
-    if (yych <= 0x8F)
-      goto yy90;
-    goto yy88;
-  yy95:
+  yy70:
     yych = *++p;
     if (yybm[0 + yych] & 64) {
-      goto yy95;
+      goto yy70;
     }
     if (yych <= ',') {
       if (yych <= ')')
-        goto yy88;
-      if (yych >= ',')
-        goto yy88;
+        goto yy72;
+      if (yych <= '+')
+        goto yy73;
     } else {
       if (yych <= '-')
-        goto yy97;
+        goto yy73;
       if (yych <= '/')
-        goto yy88;
+        goto yy72;
       if (yych <= '9')
-        goto yy98;
-      goto yy88;
+        goto yy74;
     }
-  yy97:
+  yy72:
+    p = marker;
+    goto yy66;
+  yy73:
     yych = *++p;
     if (yych == '[')
-      goto yy88;
-    goto yy100;
-  yy98:
+      goto yy72;
+    goto yy76;
+  yy74:
     yych = *++p;
     if (yych <= '\n') {
       if (yych == '\t')
-        goto yy97;
-      goto yy102;
+        goto yy73;
+      goto yy78;
     } else {
       if (yych <= '\f')
-        goto yy97;
+        goto yy73;
       if (yych == ' ')
-        goto yy97;
-      goto yy102;
+        goto yy73;
+      goto yy78;
     }
-  yy99:
+  yy75:
     yych = *++p;
-  yy100:
+  yy76:
     if (yych <= '\f') {
       if (yych == '\t')
-        goto yy99;
+        goto yy75;
       if (yych <= '\n')
-        goto yy88;
-      goto yy99;
+        goto yy72;
+      goto yy75;
     } else {
       if (yych <= ' ') {
         if (yych <= 0x1F)
-          goto yy88;
-        goto yy99;
+          goto yy72;
+        goto yy75;
       } else {
         if (yych == '[')
-          goto yy110;
-        goto yy88;
+          goto yy86;
+        goto yy72;
       }
     }
-  yy101:
+  yy77:
     yych = *++p;
-  yy102:
+  yy78:
     if (yybm[0 + yych] & 128) {
-      goto yy101;
+      goto yy77;
     }
     if (yych <= 0xC1) {
       if (yych <= '\f') {
         if (yych <= 0x08)
-          goto yy97;
+          goto yy73;
         if (yych == '\n')
-          goto yy88;
-        goto yy99;
+          goto yy72;
+        goto yy75;
       } else {
         if (yych == ' ')
-          goto yy99;
+          goto yy75;
         if (yych <= 0x7F)
-          goto yy97;
-        goto yy88;
+          goto yy73;
+        goto yy72;
       }
     } else {
       if (yych <= 0xED) {
         if (yych <= 0xDF)
-          goto yy103;
+          goto yy79;
         if (yych <= 0xE0)
-          goto yy104;
+          goto yy80;
         if (yych <= 0xEC)
-          goto yy105;
-        goto yy106;
+          goto yy81;
+        goto yy82;
       } else {
         if (yych <= 0xF0) {
           if (yych <= 0xEF)
-            goto yy105;
-          goto yy107;
+            goto yy81;
+          goto yy83;
         } else {
           if (yych <= 0xF3)
-            goto yy108;
+            goto yy84;
           if (yych <= 0xF4)
-            goto yy109;
-          goto yy88;
+            goto yy85;
+          goto yy72;
         }
       }
     }
-  yy103:
+  yy79:
     yych = *++p;
     if (yych <= 0x7F)
-      goto yy88;
+      goto yy72;
     if (yych <= 0xBF)
-      goto yy97;
-    goto yy88;
-  yy104:
+      goto yy73;
+    goto yy72;
+  yy80:
     yych = *++p;
     if (yych <= 0x9F)
-      goto yy88;
+      goto yy72;
     if (yych <= 0xBF)
-      goto yy103;
-    goto yy88;
-  yy105:
+      goto yy79;
+    goto yy72;
+  yy81:
     yych = *++p;
     if (yych <= 0x7F)
-      goto yy88;
+      goto yy72;
     if (yych <= 0xBF)
-      goto yy103;
-    goto yy88;
-  yy106:
+      goto yy79;
+    goto yy72;
+  yy82:
     yych = *++p;
     if (yych <= 0x7F)
-      goto yy88;
+      goto yy72;
     if (yych <= 0x9F)
-      goto yy103;
-    goto yy88;
-  yy107:
+      goto yy79;
+    goto yy72;
+  yy83:
     yych = *++p;
     if (yych <= 0x8F)
-      goto yy88;
+      goto yy72;
     if (yych <= 0xBF)
-      goto yy105;
-    goto yy88;
-  yy108:
+      goto yy81;
+    goto yy72;
+  yy84:
     yych = *++p;
     if (yych <= 0x7F)
-      goto yy88;
+      goto yy72;
     if (yych <= 0xBF)
-      goto yy105;
-    goto yy88;
-  yy109:
+      goto yy81;
+    goto yy72;
+  yy85:
     yych = *++p;
     if (yych <= 0x7F)
-      goto yy88;
+      goto yy72;
     if (yych <= 0x8F)
-      goto yy105;
-    goto yy88;
-  yy110:
+      goto yy81;
+    goto yy72;
+  yy86:
     yych = *++p;
     if (yych <= 'W') {
       if (yych != ' ')
-        goto yy88;
+        goto yy72;
     } else {
       if (yych <= 'X')
-        goto yy111;
+        goto yy87;
       if (yych != 'x')
-        goto yy88;
+        goto yy72;
     }
-  yy111:
+  yy87:
     yych = *++p;
     if (yych != ']')
-      goto yy88;
+      goto yy72;
     yych = *++p;
     if (yych <= '\n') {
       if (yych != '\t')
-        goto yy88;
+        goto yy72;
     } else {
       if (yych <= '\f')
-        goto yy113;
+        goto yy89;
       if (yych != ' ')
-        goto yy88;
+        goto yy72;
     }
-  yy113:
+  yy89:
     yych = *++p;
     if (yych <= '\n') {
       if (yych == '\t')
-        goto yy113;
+        goto yy89;
     } else {
       if (yych <= '\f')
-        goto yy113;
+        goto yy89;
       if (yych == ' ')
-        goto yy113;
+        goto yy89;
     }
     { return (bufsize_t)(p - start); }
   }
diff --git a/cbits/node.h b/cbits/node.h
index 6b05df1..6391db9 100644
--- a/cbits/node.h
+++ b/cbits/node.h
@@ -21,6 +21,7 @@ typedef struct {
   cmark_delim_type delimiter;
   unsigned char bullet_char;
   bool tight;
+  bool checked; // For task list extension
 } cmark_list;
 
 typedef struct {
diff --git a/cbits/table.c b/cbits/table.c
index 9829c3d..a5bb440 100644
--- a/cbits/table.c
+++ b/cbits/table.c
@@ -16,6 +16,7 @@ cmark_node_type CMARK_NODE_TABLE, CMARK_NODE_TABLE_ROW,
 
 typedef struct {
   uint16_t n_columns;
+  int paragraph_offset;
   cmark_llist *cells;
 } table_row;
 
@@ -113,22 +114,39 @@ static cmark_strbuf *unescape_pipes(cmark_mem *mem, unsigned char *string, bufsi
 static table_row *row_from_string(cmark_syntax_extension *self,
                                   cmark_parser *parser, unsigned char *string,
                                   int len) {
+  // Parses a single table row. It has the following form:
+  // `delim? table_cell (delim table_cell)* delim? newline`
+  // Note that cells are allowed to be empty.
+  //
+  // From the GitHub-flavored Markdown specification:
+  //
+  // > Each row consists of cells containing arbitrary text, in which inlines
+  // > are parsed, separated by pipes (|). A leading and trailing pipe is also
+  // > recommended for clarity of reading, and if there’s otherwise parsing
+  // > ambiguity.
+
   table_row *row = NULL;
   bufsize_t cell_matched = 1, pipe_matched = 1, offset;
+  int expect_more_cells = 1;
+  int row_end_offset = 0;
 
   row = (table_row *)parser->mem->calloc(1, sizeof(table_row));
   row->n_columns = 0;
   row->cells = NULL;
 
+  // Scan past the (optional) leading pipe.
   offset = scan_table_cell_end(string, len, 0);
 
   // Parse the cells of the row. Stop if we reach the end of the input, or if we
   // cannot detect any more cells.
-  while (offset < len && (cell_matched || pipe_matched)) {
+  while (offset < len && expect_more_cells) {
     cell_matched = scan_table_cell(string, len, offset);
     pipe_matched = scan_table_cell_end(string, len, offset + cell_matched);
 
     if (cell_matched || pipe_matched) {
+      // We are guaranteed to have a cell, since (1) either we found some
+      // content and cell_matched, or (2) we found an empty cell followed by a
+      // pipe.
       cmark_strbuf *cell_buf = unescape_pipes(parser->mem, string + offset,
           cell_matched);
       cmark_strbuf_trim(cell_buf);
@@ -137,23 +155,46 @@ static table_row *row_from_string(cmark_syntax_extension *self,
       cell->buf = cell_buf;
       cell->start_offset = offset;
       cell->end_offset = offset + cell_matched - 1;
+
       while (cell->start_offset > 0 && string[cell->start_offset - 1] != '|') {
         --cell->start_offset;
         ++cell->internal_offset;
       }
+
       row->n_columns += 1;
       row->cells = cmark_llist_append(parser->mem, row->cells, cell);
     }
 
     offset += cell_matched + pipe_matched;
 
-    if (!pipe_matched) {
-      pipe_matched = scan_table_row_end(string, len, offset);
-      offset += pipe_matched;
+    if (pipe_matched) {
+      expect_more_cells = 1;
+    } else {
+      // We've scanned the last cell. Check if we have reached the end of the row
+      row_end_offset = scan_table_row_end(string, len, offset);
+      offset += row_end_offset;
+
+      // If the end of the row is not the end of the input,
+      // the row is not a real row but potentially part of the paragraph
+      // preceding the table.
+      if (row_end_offset && offset != len) {
+        row->paragraph_offset = offset;
+
+        cmark_llist_free_full(parser->mem, row->cells, (cmark_free_func)free_table_cell);
+        row->cells = NULL;
+        row->n_columns = 0;
+
+        // Scan past the (optional) leading pipe.
+        offset += scan_table_cell_end(string, len, offset);
+
+        expect_more_cells = 1;
+      } else {
+        expect_more_cells = 0;
+      }
     }
   }
 
-  if (offset != len || !row->n_columns) {
+  if (offset != len || row->n_columns == 0) {
     free_table_row(parser->mem, row);
     row = NULL;
   }
@@ -161,12 +202,30 @@ static table_row *row_from_string(cmark_syntax_extension *self,
   return row;
 }
 
+static void try_inserting_table_header_paragraph(cmark_parser *parser,
+                                                 cmark_node *parent_container,
+                                                 unsigned char *parent_string,
+                                                 int paragraph_offset) {
+  cmark_node *paragraph;
+  cmark_strbuf *paragraph_content;
+
+  paragraph = cmark_node_new_with_mem(CMARK_NODE_PARAGRAPH, parser->mem);
+
+  paragraph_content = unescape_pipes(parser->mem, parent_string, paragraph_offset);
+  cmark_strbuf_trim(paragraph_content);
+  cmark_node_set_string_content(paragraph, (char *) paragraph_content->ptr);
+  cmark_strbuf_free(paragraph_content);
+  parser->mem->free(paragraph_content);
+
+  if (!cmark_node_insert_before(parent_container, paragraph)) {
+    parser->mem->free(paragraph);
+  }
+}
+
 static cmark_node *try_opening_table_header(cmark_syntax_extension *self,
                                             cmark_parser *parser,
                                             cmark_node *parent_container,
                                             unsigned char *input, int len) {
-  bufsize_t matched =
-      scan_table_start(input, len, cmark_parser_get_first_nonspace(parser));
   cmark_node *table_header;
   table_row *header_row = NULL;
   table_row *marker_row = NULL;
@@ -174,41 +233,37 @@ static cmark_node *try_opening_table_header(cmark_syntax_extension *self,
   const char *parent_string;
   uint16_t i;
 
-  if (!matched)
-    return parent_container;
-
-  parent_string = cmark_node_get_string_content(parent_container);
-
-  cmark_arena_push();
-
-  header_row = row_from_string(self, parser, (unsigned char *)parent_string,
-                               (int)strlen(parent_string));
-
-  if (!header_row) {
-    free_table_row(parser->mem, header_row);
-    cmark_arena_pop();
+  if (!scan_table_start(input, len, cmark_parser_get_first_nonspace(parser))) {
     return parent_container;
   }
 
+  // Since scan_table_start was successful, we must have a marker row.
   marker_row = row_from_string(self, parser,
                                input + cmark_parser_get_first_nonspace(parser),
                                len - cmark_parser_get_first_nonspace(parser));
-
   assert(marker_row);
 
-  if (header_row->n_columns != marker_row->n_columns) {
-    free_table_row(parser->mem, header_row);
+  cmark_arena_push();
+
+  // Check for a matching header row. We call `row_from_string` with the entire
+  // (potentially long) parent container as input, but this should be safe since
+  // `row_from_string` bails out early if it does not find a row.
+  parent_string = cmark_node_get_string_content(parent_container);
+  header_row = row_from_string(self, parser, (unsigned char *)parent_string,
+                               (int)strlen(parent_string));
+  if (!header_row || header_row->n_columns != marker_row->n_columns) {
     free_table_row(parser->mem, marker_row);
+    free_table_row(parser->mem, header_row);
     cmark_arena_pop();
     return parent_container;
   }
 
   if (cmark_arena_pop()) {
+    marker_row = row_from_string(
+        self, parser, input + cmark_parser_get_first_nonspace(parser),
+        len - cmark_parser_get_first_nonspace(parser));
     header_row = row_from_string(self, parser, (unsigned char *)parent_string,
                                  (int)strlen(parent_string));
-    marker_row = row_from_string(self, parser,
-                                 input + cmark_parser_get_first_nonspace(parser),
-                                 len - cmark_parser_get_first_nonspace(parser));
   }
 
   if (!cmark_node_set_type(parent_container, CMARK_NODE_TABLE)) {
@@ -217,10 +272,13 @@ static cmark_node *try_opening_table_header(cmark_syntax_extension *self,
     return parent_container;
   }
 
-  cmark_node_set_syntax_extension(parent_container, self);
+  if (header_row->paragraph_offset) {
+    try_inserting_table_header_paragraph(parser, parent_container, (unsigned char *)parent_string,
+                                         header_row->paragraph_offset);
+  }
 
+  cmark_node_set_syntax_extension(parent_container, self);
   parent_container->as.opaque = parser->mem->calloc(1, sizeof(node_table));
-
   set_n_table_columns(parent_container, header_row->n_columns);
 
   uint8_t *alignments =
diff --git a/cbits/tasklist.c b/cbits/tasklist.c
index 3c273fc..7bef454 100644
--- a/cbits/tasklist.c
+++ b/cbits/tasklist.c
@@ -9,19 +9,33 @@ typedef enum {
   CMARK_TASKLIST_CHECKED,
 } cmark_tasklist_type;
 
+// Local constants
+static const char *TYPE_STRING = "tasklist";
+
 static const char *get_type_string(cmark_syntax_extension *extension, cmark_node *node) {
-  return "tasklist";
+  return TYPE_STRING;
 }
 
-char *cmark_gfm_extensions_get_tasklist_state(cmark_node *node) {
-  if (!node || ((int)node->as.opaque != CMARK_TASKLIST_CHECKED && (int)node->as.opaque != CMARK_TASKLIST_NOCHECKED))
+
+// Return 1 if state was set, 0 otherwise
+int cmark_gfm_extensions_set_tasklist_item_checked(cmark_node *node, bool is_checked) {
+  // The node has to exist, and be an extension, and actually be the right type in order to get the value.
+  if (!node || !node->extension || strcmp(cmark_node_get_type_string(node), TYPE_STRING))
     return 0;
 
-  if ((int)node->as.opaque != CMARK_TASKLIST_CHECKED) {
-    return "checked";
+  node->as.list.checked = is_checked;
+  return 1;
+}
+
+bool cmark_gfm_extensions_get_tasklist_item_checked(cmark_node *node) {
+  if (!node || !node->extension || strcmp(cmark_node_get_type_string(node), TYPE_STRING))
+    return false;
+
+  if (node->as.list.checked) {
+    return true;
   }
   else {
-    return "unchecked";
+    return false;
   }
 }
 
@@ -74,11 +88,8 @@ static cmark_node *open_tasklist_item(cmark_syntax_extension *self,
   cmark_node_set_syntax_extension(parent_container, self);
   cmark_parser_advance_offset(parser, (char *)input, 3, false);
 
-  if (strstr((char*)input, "[x]")) {
-    parent_container->as.opaque = (void *)CMARK_TASKLIST_CHECKED;
-  } else {
-    parent_container->as.opaque = (void *)CMARK_TASKLIST_NOCHECKED;
-  }
+  // Either an upper or lower case X means the task is completed.
+  parent_container->as.list.checked = (strstr((char*)input, "[x]") || strstr((char*)input, "[X]"));
 
   return NULL;
 }
@@ -89,7 +100,7 @@ static void commonmark_render(cmark_syntax_extension *extension,
   bool entering = (ev_type == CMARK_EVENT_ENTER);
   if (entering) {
     renderer->cr(renderer);
-    if ((int)node->as.opaque == CMARK_TASKLIST_CHECKED) {
+    if (node->as.list.checked) {
       renderer->out(renderer, node, "- [x] ", false, LITERAL);
     } else {
       renderer->out(renderer, node, "- [ ] ", false, LITERAL);
@@ -110,7 +121,7 @@ static void html_render(cmark_syntax_extension *extension,
     cmark_strbuf_puts(renderer->html, "<li");
     cmark_html_render_sourcepos(node, renderer->html, options);
     cmark_strbuf_putc(renderer->html, '>');
-    if ((int)node->as.opaque == CMARK_TASKLIST_CHECKED) {
+    if (node->as.list.checked) {
       cmark_strbuf_puts(renderer->html, "<input type=\"checkbox\" checked=\"\" disabled=\"\" /> ");
     } else {
       cmark_strbuf_puts(renderer->html, "<input type=\"checkbox\" disabled=\"\" /> ");
@@ -120,6 +131,15 @@ static void html_render(cmark_syntax_extension *extension,
   }
 }
 
+static const char *xml_attr(cmark_syntax_extension *extension,
+                            cmark_node *node) {
+  if (node->as.list.checked) {
+    return " completed=\"true\"";
+  } else {
+    return " completed=\"false\"";
+  }
+}
+
 cmark_syntax_extension *create_tasklist_extension(void) {
   cmark_syntax_extension *ext = cmark_syntax_extension_new("tasklist");
 
@@ -130,6 +150,7 @@ cmark_syntax_extension *create_tasklist_extension(void) {
   cmark_syntax_extension_set_commonmark_render_func(ext, commonmark_render);
   cmark_syntax_extension_set_plaintext_render_func(ext, commonmark_render);
   cmark_syntax_extension_set_html_render_func(ext, html_render);
+  cmark_syntax_extension_set_xml_attr_func(ext, xml_attr);
 
   return ext;
 }