diff --git a/src/calibre/srv/render_book.py b/src/calibre/srv/render_book.py
index 0a8dfb3f4f..e10afbbdb5 100644
--- a/src/calibre/srv/render_book.py
+++ b/src/calibre/srv/render_book.py
@@ -8,7 +8,7 @@ import json
 import os
 import re
 import sys
-from collections import OrderedDict, defaultdict
+from collections import defaultdict
 from datetime import datetime
 from functools import partial
 from itertools import count
@@ -142,37 +142,11 @@ def transform_declaration(decl):
     return changed
 
 
-def replace_epub_type_selector(m):
-    which = m.group(2)
-    roleval = EPUB_TYPE_MAP.get(which)
-    if roleval is None:
-        return m.group()
-    return 'role{}"{}"'.format(m.group(1), roleval)
-
-
-def epub_type_pat():
-    ans = getattr(epub_type_pat, 'ans', None)
-    if ans is None:
-        ans = epub_type_pat.ans = re.compile(r'epub\|type([$*~]?=)"(\S+)"')
-    return ans
-
-
-def transform_selector(rule):
-    selector = rule.selectorText
-    if 'epub|type' in selector:
-        ns, num = epub_type_pat().subn(replace_epub_type_selector, selector)
-        if num > 0 and ns != selector:
-            rule.selectorText = ns
-            return True
-
-
 def transform_sheet(sheet):
     changed = False
     for rule in sheet.cssRules.rulesOfType(CSSRule.STYLE_RULE):
         if transform_declaration(rule.style):
             changed = True
-        if transform_selector(rule):
-            changed = True
     return changed
 
 
@@ -543,41 +517,6 @@ def split_name(name):
 
 boolean_attributes = frozenset('allowfullscreen,async,autofocus,autoplay,checked,compact,controls,declare,default,defaultchecked,defaultmuted,defaultselected,defer,disabled,enabled,formnovalidate,hidden,indeterminate,inert,ismap,itemscope,loop,multiple,muted,nohref,noresize,noshade,novalidate,nowrap,open,pauseonexit,readonly,required,reversed,scoped,seamless,selected,sortable,truespeed,typemustmatch,visible'.split(','))  # noqa
 
-# see https://idpf.github.io/epub-guides/epub-aria-authoring/
-EPUB_TYPE_MAP = {k:'doc-' + k for k in (
-    'abstract acknowledgements afterword appendix biblioentry bibliography biblioref chapter colophon conclusion cover credit'
-    ' credits dedication epigraph epilogue errata footnote footnotes forward glossary glossref index introduction link noteref notice'
-    ' pagebreak pagelist part preface prologue pullquote qna locator subtitle title toc').split(' ')}
-for k in 'figure term definition directory list list-item table row cell'.split(' '):
-    EPUB_TYPE_MAP[k] = k
-
-EPUB_TYPE_MAP['help'] = 'doc-tip'
-EPUB_TYPE_MAP['page-list'] = 'doc-pagelist'
-
-
-def map_epub_type(epub_type, attribs, elem):
-    val = EPUB_TYPE_MAP.get(epub_type.lower())
-    if val:
-        role = None
-        in_attribs = None
-        for i, x in enumerate(attribs):
-            if x[0] == 'role':
-                role = x[1]
-                in_attribs = i
-                break
-        else:
-            role = elem.get('role')
-        roles = OrderedDict([(k, True) for k in role.split()]) if role else OrderedDict()
-        if val not in roles:
-            roles[val] = True
-        role = ' '.join(roles)
-        if in_attribs is None:
-            attribs.append(['role', role])
-        else:
-            attribs[in_attribs] = ['role', role]
-        return True
-    return False
-
 
 known_tags = ('img', 'script', 'link', 'image', 'style')
 discarded_tags = ('meta', 'base')
@@ -611,9 +550,6 @@ def serialize_elem(elem, nsmap):
             if val and val.lower() in (al, ''):
                 attribs.append([al, al])
             continue
-        if attr_ns == EPUB_NS and al == 'type':
-            map_epub_type(val, attribs, elem)
-            continue
         attrib = [aname, val]
         if attr_ns:
             attr_ns = nsmap[attr_ns]
diff --git a/src/pyj/read_book/resources.pyj b/src/pyj/read_book/resources.pyj
index 7c219f0ec6..814ae4039d 100644
--- a/src/pyj/read_book/resources.pyj
+++ b/src/pyj/read_book/resources.pyj
@@ -164,7 +164,7 @@ def finalize_resources(book, root_name, resource_data):
 
 js_types = {k: True for k in 'text/javascript text/ecmascript application/javascript application/ecmascript'.split(' ')}
 resource_tag_names = {'script':'src', 'link':'href', 'img':'src', 'image':'xlink:href'}
-ns_rmap = {'http://www.w3.org/2000/svg':'svg', 'http://www.w3.org/1999/xlink':'xlink', 'http://www.w3.org/1998/Math/MathML':'math', 'http://www.w3.org/XML/1998/namespace': 'xml'}
+ns_rmap = {'http://www.w3.org/2000/svg':'svg', 'http://www.w3.org/1999/xlink':'xlink', 'http://www.w3.org/1998/Math/MathML':'math', 'http://www.w3.org/XML/1998/namespace': 'xml', 'http://www.idpf.org/2007/ops': 'epub'}
 ns_count = 0
 hide_tooltips = False