LibWeb: Fix off-by-one for alphabetical markers in <ol>s

The ListItemMarker gets its index 1-based while the
String::bijective_base_from expects its index to be 0-based. This patch
adjusts the index passed around accordingly.

1 files changed, 2 insertions, 2 deletions

diff --git a/Userland/Libraries/LibWeb/Layout/ListItemMarkerBox.cpp b/Userland/Libraries/LibWeb/Layout/ListItemMarkerBox.cpp
index e04e5a7b9f..3833755dad 100644
--- a/Userland/Libraries/LibWeb/Layout/ListItemMarkerBox.cpp
+++ b/Userland/Libraries/LibWeb/Layout/ListItemMarkerBox.cpp
@@ -30,11 +30,11 @@ ListItemMarkerBox::ListItemMarkerBox(DOM::Document& document, CSS::ListStyleType
         break;
     case CSS::ListStyleType::LowerAlpha:
     case CSS::ListStyleType::LowerLatin:
-        m_text = String::bijective_base_from(m_index).to_lowercase();
+        m_text = String::bijective_base_from(m_index - 1).to_lowercase();
         break;
     case CSS::ListStyleType::UpperAlpha:
     case CSS::ListStyleType::UpperLatin:
-        m_text = String::bijective_base_from(m_index);
+        m_text = String::bijective_base_from(m_index - 1);
         break;
     case CSS::ListStyleType::None:
         break;