diff --git a/ChangeLog.txt b/ChangeLog.txt
index 33403311fa..9eebcfa14f 100644
--- a/ChangeLog.txt
+++ b/ChangeLog.txt
@@ -3,8 +3,10 @@ pre-2.x.x
       - assign menu accelerators P - &Plugins, and K - Chec&kpoints (thank you BeckyEbook)
       - add ability to change keyboard focus using keyboard shortcuts or menus
           to BookBrowser, Preview, CodeView, ClipsWindow, and TableOfContents Windows
-	Bug Fixes
-	  - patch Qt6.5.3 to avoid transient child window resize bug on Windows
+    Bug Fixes
+      - patch Qt6.5.3 to avoid transient child window resize bug on Windows
+      - fix QuickParser bug when parseing attribute names not properly ignoreing all legal whitespace
+
 
 Sigil-2.0.2
     Bug Fixes
diff --git a/src/Parsers/QuickParser.cpp b/src/Parsers/QuickParser.cpp
index 051ecc0b7c..24f0919060 100644
--- a/src/Parsers/QuickParser.cpp
+++ b/src/Parsers/QuickParser.cpp
@@ -1,6 +1,6 @@
 /************************************************************************
 **
-**  Copyright (C) 2020-2021 Kevin B. Hendricks, Stratford Ontario
+**  Copyright (C) 2020-2023 Kevin B. Hendricks, Stratford Ontario
 **
 **  This file is part of Sigil.
 **
@@ -29,6 +29,8 @@
 #include "Misc/Utility.h"
 #include "Parsers/QuickParser.h"
 
+const QString WHITESPACE_CHARS=" \v\t\n\r\f";
+
 QuickParser::QuickParser(const QString &source, QString default_lang)
     : m_source(source),
       m_pos(0),
@@ -261,7 +263,7 @@ int QuickParser::findTarget(const QString &tgt, int p, bool after)
 
 int QuickParser::skipAnyBlanks(const QStringRef &tgt, int p)
 {
-    while((p < tgt.length()) && (tgt.at(p) == ' ')) p++;
+    while((p < tgt.length()) && (WHITESPACE_CHARS.contains(tgt.at(p)))) p++;
     return p;
 }
 
diff --git a/src/Resource_Files/plugin_launchers/python/quickparser.py b/src/Resource_Files/plugin_launchers/python/quickparser.py
index f82647afb6..36d8faca41 100644
--- a/src/Resource_Files/plugin_launchers/python/quickparser.py
+++ b/src/Resource_Files/plugin_launchers/python/quickparser.py
@@ -2,7 +2,7 @@
 # -*- coding: utf-8 -*-
 # vim:ts=4:sw=4:softtabstop=4:smarttab:expandtab
 
-# Copyright (c) 2014-2021 Kevin B. Hendricks, and Doug Massay
+# Copyright (c) 2014-2023 Kevin B. Hendricks, and Doug Massay
 # Copyright (c) 2014      John Schember
 # All rights reserved.
 #
@@ -39,6 +39,8 @@
 
 SPECIAL_HANDLING_TYPES = ['xmlheader', 'doctype', 'comment', 'cdata', 'pi']
 
+WHITESPACE_CHARS = (' ', '\n', '\r', '\f', '\t', '\v')
+
 class QuickXHTMLParser(object):
 
     def __init__(self):
@@ -109,14 +111,14 @@ def parsetag(self, s):
         if ttype is None:
             # parse any attributes
             while s.find('=', p) != -1 :
-                while p < n and s[p:p + 1] == ' ' : p += 1
+                while p < n and s[p:p + 1] in WHITESPACE_CHARS : p += 1
                 b = p
                 while p < n and s[p:p + 1] != '=' : p += 1
                 # attribute names can be mixed case and are in SVG
                 aname = s[b:p]
                 aname = aname.rstrip(' ')
                 p += 1
-                while p < n and s[p:p + 1] == ' ' : p += 1
+                while p < n and s[p:p + 1] in WHITESPACE_CHARS : p += 1
                 if s[p:p + 1] in ('"', "'") :
                     qt = s[p:p + 1]
                     p = p + 1