diff --git a/humanfriendly/terminal/html.py b/humanfriendly/terminal/html.py
index 4214e09..34e8131 100644
--- a/humanfriendly/terminal/html.py
+++ b/humanfriendly/terminal/html.py
@@ -339,9 +339,9 @@ def parse_color(self, value):
             elif length == 3:
                 # Three hex digits (shorthand).
                 return (
-                    int(value[0], 16),
-                    int(value[1], 16),
-                    int(value[2], 16),
+                    int(value[0] * 2, 16),
+                    int(value[1] * 2, 16),
+                    int(value[2] * 2, 16),
                 )
         # Try to recognize a named color.
         value = value.lower()
diff --git a/humanfriendly/tests.py b/humanfriendly/tests.py
index 72dad99..ce090dc 100644
--- a/humanfriendly/tests.py
+++ b/humanfriendly/tests.py
@@ -1078,6 +1078,18 @@ def callback(text):
                 title="VPS hosting" rel="external"&gt;True</a>
         ''')
 
+    def test_html_shorthand_colors(self):
+        """CSS short hex colors expand each digit before ANSI rendering."""
+        from humanfriendly.terminal.html import HTMLConverter
+        converter = HTMLConverter()
+        for short, full, rgb in [('#fff', '#ffffff', (255, 255, 255)),
+                                 ('#aBc', '#aaBBcc', (170, 187, 204)),
+                                 ('#123', '#112233', (17, 34, 51))]:
+            self.assertEqual(converter.parse_color(short), rgb)
+            for prop in ('color', 'background-color'):
+                template = '<span style="%s: %%s">text</span>' % prop
+                self.assertEqual(html_to_ansi(template % short), html_to_ansi(template % full))
+
     def test_generate_output(self):
         """Test the :func:`humanfriendly.terminal.output()` function."""
         text = "Standard output generated by output()"