From bf18b7273fa2e5a64721c246c5773131814aaab2 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 16 Oct 2019 06:19:28 +0530
Subject: [PATCH] Filter out <base> when rendering books

---
 src/calibre/srv/render_book.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/calibre/srv/render_book.py b/src/calibre/srv/render_book.py
index 7670f70383..81e7b0b17f 100644
--- a/src/calibre/srv/render_book.py
+++ b/src/calibre/srv/render_book.py
@@ -587,8 +587,10 @@ def serialize_elem(elem, nsmap):
     nl = name.lower()
     if ns == EPUB_NS:
         ns, name = None, 'epub-' + name
-    if nl == 'meta':
-        return  # Filter out <meta> tags as they have unknown side-effects
+    if nl in ('meta', 'base'):
+        # Filter out <meta> tags as they have unknown side-effects
+        # Filter out <base> tags as the viewer uses <base> for URL resolution
+        return
     if nl in known_tags:
         name = nl
     ans = {'n':name}