1 files changed, 4 insertions, 1 deletions
diff --git a/WebCore/platform/graphics/TextRun.h b/WebCore/platform/graphics/TextRun.h
index 79b6cb3..dce5535 100644
--- a/WebCore/platform/graphics/TextRun.h
+++ b/WebCore/platform/graphics/TextRun.h
@@ -117,7 +117,10 @@ private:
     const UChar* m_characters;
     int m_len;
 
-    int m_xpos;
+    // m_xpos is the x position relative to the left start of the text line, not relative to the left
+    // start of the containing block. In the case of right alignment or center alignment, left start of
+    // the text line is not the same as left start of the containing block.
+    int m_xpos;  
     int m_padding;
 #if ENABLE(SVG)
     float m_horizontalGlyphStretch;