From 09cbcd3413283169ee7569d34e66c8b704736a27 Mon Sep 17 00:00:00 2001
From: Job Bautista <jobbautista9@protonmail.com>
Date: Fri, 23 Dec 2022 19:21:40 +0800
Subject: [PATCH] Issue #2063 - Ensure a floated ::first-letter inherits from
 ::first-line.

This fixes the 24 year old Mozilla bug 13610.

Co-authored-by: Ryo Onodera <ryoqun@gmail.com>
---
 layout/generic/nsFrame.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/layout/generic/nsFrame.cpp b/layout/generic/nsFrame.cpp
index 291270db99..69d9376e5b 100644
--- a/layout/generic/nsFrame.cpp
+++ b/layout/generic/nsFrame.cpp
@@ -9033,6 +9033,13 @@ nsFrame::CorrectStyleParentFrame(nsIFrame* aProspectiveParent,
         parent = sibling;
       }
     }
+
+    // Ensure ::first-letter inherits from ::first-line even when floated, see
+    // Issue #2063 / Mozilla bug 13610.
+    if (parent->GetType() == nsGkAtoms::lineFrame &&
+        parent == parent->FirstInFlow()) {
+      return parent;
+    }
       
     nsIAtom* parentPseudo = parent->StyleContext()->GetPseudo();
     if (!parentPseudo ||