diff --git a/src/Node/Block/ListItem.php b/src/Node/Block/ListItem.php
index f6eea4e..3a6a412 100644
--- a/src/Node/Block/ListItem.php
+++ b/src/Node/Block/ListItem.php
@@ -9,21 +9,68 @@
  */
 class ListItem extends BlockNode
 {
-    public function __construct(protected ?bool $checked = null)
-    {
+    /**
+     * @var string
+     */
+    public const STATE_PENDING = 'pending';
+
+    /**
+     * @var string
+     */
+    public const STATE_DONE = 'done';
+
+    /**
+     * @var string
+     */
+    public const STATE_CANCELLED = 'cancelled';
+
+    /**
+     * @var string
+     */
+    public const STATE_DEFERRED = 'deferred';
+
+    /**
+     * @var string
+     */
+    public const STATE_QUESTION = 'question';
+
+    public function __construct(
+        protected ?bool $checked = null,
+        protected ?string $taskState = null,
+    ) {
+        // BC: derive taskState from checked if not explicitly set
+        if ($this->taskState === null && $this->checked !== null) {
+            $this->taskState = $this->checked ? self::STATE_DONE : self::STATE_PENDING;
+        }
+        // Also derive checked from taskState for BC
+        if ($this->taskState !== null && $this->checked === null) {
+            $this->checked = $this->taskState === self::STATE_DONE;
+        }
     }
 
     /**
      * For task lists: null = not a task, true = checked, false = unchecked
+     *
+     * @deprecated Use getTaskState() for extended states
      */
     public function getChecked(): ?bool
     {
         return $this->checked;
     }
 
+    /**
+     * Get the task state for extended task lists
+     *
+     * @return string|null One of STATE_* constants, or null if not a task
+     */
+    public function getTaskState(): ?string
+    {
+        return $this->taskState;
+    }
+
     public function isTask(): bool
     {
-        return $this->checked !== null;
+        return $this->taskState !== null;
     }
 
     public function getType(): string
diff --git a/src/Parser/BlockParser.php b/src/Parser/BlockParser.php
index a8c705b..7d7b652 100644
--- a/src/Parser/BlockParser.php
+++ b/src/Parser/BlockParser.php
@@ -1511,7 +1511,10 @@ protected function tryParseList(Node $parent, array $lines, int $start): ?int
                 $list->setTight(false);
             }
 
-            $listItem = new ListItem($itemInfo['checked'] ?? null);
+            $listItem = new ListItem(
+                $itemInfo['checked'] ?? null,
+                $itemInfo['taskState'] ?? null,
+            );
             $itemContent = $itemInfo['content'];
 
             // Collect item content lines (without blank line = tight continuation)
@@ -1934,14 +1937,24 @@ protected function disambiguateListStyle(array $listInfo, array $lines, int $sta
      */
     protected function parseListItemMarker(string $line): ?array
     {
-        // Task list: - [ ] or - [x] or - [X]
+        // Task list: - [ ] or - [x] or - [X] or extended states: [-] [>] [?]
         // Space after marker is syntax delimiter - must be space(s) per spec, not tab
-        if (preg_match('/^[-*+] +\[([ xX])\] +(.*)$/', $line, $matches)) {
+        if (preg_match('/^[-*+] +\[([ xX\->?])\] +(.*)$/', $line, $matches)) {
+            $marker = $matches[1];
+            $taskState = match (strtolower($marker)) {
+                ' ' => ListItem::STATE_PENDING,
+                'x' => ListItem::STATE_DONE,
+                '-' => ListItem::STATE_CANCELLED,
+                '>' => ListItem::STATE_DEFERRED,
+                default => ListItem::STATE_QUESTION, // '?' is the only remaining option from regex
+            };
+
             return [
                 'type' => ListBlock::TYPE_TASK,
                 'marker' => '-',
                 'content' => $matches[2],
-                'checked' => strtolower($matches[1]) === 'x',
+                'checked' => $taskState === ListItem::STATE_DONE,
+                'taskState' => $taskState,
             ];
         }
 
diff --git a/src/Renderer/HtmlRenderer.php b/src/Renderer/HtmlRenderer.php
index 91bc7ec..89a418d 100644
--- a/src/Renderer/HtmlRenderer.php
+++ b/src/Renderer/HtmlRenderer.php
@@ -558,10 +558,23 @@ protected function renderListItem(ListItem $node, bool $tight = true): string
 
         // Handle task list items
         if ($node->isTask()) {
+            $taskState = $node->getTaskState();
             $checked = $node->getChecked() ? ' checked=""' : '';
+
+            // Add data-state for extended task states (cancelled, deferred, question)
+            $dataState = '';
+            if ($taskState !== null && !in_array($taskState, [ListItem::STATE_PENDING, ListItem::STATE_DONE], true)) {
+                $dataState = ' data-state="' . $taskState . '"';
+            }
+
             // Always use xhtml-style format for task list checkboxes
-            $checkbox = '<input disabled="" type="checkbox"' . $checked . "/>\n";
+            $checkbox = '<input disabled="" type="checkbox"' . $checked . $dataState . "/>\n";
             $content = $checkbox . rtrim($content);
+
+            // Add class to li for extended states
+            if ($taskState !== null && $taskState !== ListItem::STATE_PENDING && $taskState !== ListItem::STATE_DONE) {
+                $attrs .= ' class="task-' . $taskState . '"';
+            }
         } else {
             $content = rtrim($content);
         }
diff --git a/tests/TestCase/Parser/BlockParserTest.php b/tests/TestCase/Parser/BlockParserTest.php
index 20a1e38..3348b34 100644
--- a/tests/TestCase/Parser/BlockParserTest.php
+++ b/tests/TestCase/Parser/BlockParserTest.php
@@ -10,6 +10,7 @@
 use Djot\Node\Block\Div;
 use Djot\Node\Block\Heading;
 use Djot\Node\Block\ListBlock;
+use Djot\Node\Block\ListItem;
 use Djot\Node\Block\Paragraph;
 use Djot\Node\Block\Table;
 use Djot\Node\Block\ThematicBreak;
@@ -147,6 +148,45 @@ public function testParseTaskList(): void
         $this->assertSame('list', $list->getType());
     }
 
+    public function testParseExtendedTaskStates(): void
+    {
+        $doc = $this->parser->parse(
+            "- [ ] Pending\n- [x] Done\n- [-] Cancelled\n- [>] Deferred\n- [?] Question",
+        );
+
+        $list = $doc->getChildren()[0];
+        $this->assertInstanceOf(ListBlock::class, $list);
+        $this->assertSame(ListBlock::TYPE_TASK, $list->getListType());
+
+        $items = $list->getChildren();
+        $this->assertCount(5, $items);
+
+        // Pending [ ]
+        $this->assertInstanceOf(ListItem::class, $items[0]);
+        $this->assertSame(ListItem::STATE_PENDING, $items[0]->getTaskState());
+        $this->assertFalse($items[0]->getChecked());
+
+        // Done [x]
+        $this->assertInstanceOf(ListItem::class, $items[1]);
+        $this->assertSame(ListItem::STATE_DONE, $items[1]->getTaskState());
+        $this->assertTrue($items[1]->getChecked());
+
+        // Cancelled [-]
+        $this->assertInstanceOf(ListItem::class, $items[2]);
+        $this->assertSame(ListItem::STATE_CANCELLED, $items[2]->getTaskState());
+        $this->assertFalse($items[2]->getChecked());
+
+        // Deferred [>]
+        $this->assertInstanceOf(ListItem::class, $items[3]);
+        $this->assertSame(ListItem::STATE_DEFERRED, $items[3]->getTaskState());
+        $this->assertFalse($items[3]->getChecked());
+
+        // Question [?]
+        $this->assertInstanceOf(ListItem::class, $items[4]);
+        $this->assertSame(ListItem::STATE_QUESTION, $items[4]->getTaskState());
+        $this->assertFalse($items[4]->getChecked());
+    }
+
     public function testParseDefinitionList(): void
     {
         $doc = $this->parser->parse(": Term\n\n    Definition");
diff --git a/tests/TestCase/Renderer/HtmlRendererTest.php b/tests/TestCase/Renderer/HtmlRendererTest.php
index ab38544..6d0de5f 100644
--- a/tests/TestCase/Renderer/HtmlRendererTest.php
+++ b/tests/TestCase/Renderer/HtmlRendererTest.php
@@ -6,6 +6,8 @@
 
 use Djot\Node\Block\CodeBlock;
 use Djot\Node\Block\Heading;
+use Djot\Node\Block\ListBlock;
+use Djot\Node\Block\ListItem;
 use Djot\Node\Block\Paragraph;
 use Djot\Node\Document;
 use Djot\Node\Inline\Code;
@@ -247,4 +249,45 @@ public function testNestedInlineElements(): void
 
         $this->assertSame("<p><strong><em>bold and italic</em></strong></p>\n", $result);
     }
+
+    public function testRenderExtendedTaskStates(): void
+    {
+        $doc = new Document();
+        $list = new ListBlock(ListBlock::TYPE_TASK);
+
+        // Cancelled task [-]
+        $item1 = new ListItem(null, ListItem::STATE_CANCELLED);
+        $para1 = new Paragraph();
+        $para1->appendChild(new Text('Cancelled task'));
+        $item1->appendChild($para1);
+        $list->appendChild($item1);
+
+        // Deferred task [>]
+        $item2 = new ListItem(null, ListItem::STATE_DEFERRED);
+        $para2 = new Paragraph();
+        $para2->appendChild(new Text('Deferred task'));
+        $item2->appendChild($para2);
+        $list->appendChild($item2);
+
+        // Question task [?]
+        $item3 = new ListItem(null, ListItem::STATE_QUESTION);
+        $para3 = new Paragraph();
+        $para3->appendChild(new Text('Question task'));
+        $item3->appendChild($para3);
+        $list->appendChild($item3);
+
+        $doc->appendChild($list);
+
+        $result = $this->renderer->render($doc);
+
+        // Check for data-state attributes
+        $this->assertStringContainsString('data-state="cancelled"', $result);
+        $this->assertStringContainsString('data-state="deferred"', $result);
+        $this->assertStringContainsString('data-state="question"', $result);
+
+        // Check for task-* classes on li elements
+        $this->assertStringContainsString('class="task-cancelled"', $result);
+        $this->assertStringContainsString('class="task-deferred"', $result);
+        $this->assertStringContainsString('class="task-question"', $result);
+    }
 }