From 7c6dbd37eb3e785f875e0030d723e422db72d453 Mon Sep 17 00:00:00 2001
From: John MacFarlane <jgm@berkeley.edu>
Date: Sat, 30 May 2020 12:10:27 -0700
Subject: Change default revealjs-url to use CDN version of revealjs v4.

See #6408.
---
 MANUAL.txt                      | 3 ++-
 src/Text/Pandoc/Writers/HTML.hs | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/MANUAL.txt b/MANUAL.txt
index 1bdb09850..52474c9bc 100644
--- a/MANUAL.txt
+++ b/MANUAL.txt
@@ -2146,7 +2146,8 @@ All [reveal.js configuration options] are available as variables.
 To turn off boolean flags that default to true in reveal.js, use `0`.
 
 `revealjs-url`
-:   base URL for reveal.js documents (defaults to `reveal.js`)
+:   base URL for reveal.js documents (defaults to
+    `https://unpkg.com/reveal.js@^4/`)
 
 `s5-url`
 :   base URL for S5 documents (defaults to `s5/default`)
diff --git a/src/Text/Pandoc/Writers/HTML.hs b/src/Text/Pandoc/Writers/HTML.hs
index 9f51c28de..11daaf06b 100644
--- a/src/Text/Pandoc/Writers/HTML.hs
+++ b/src/Text/Pandoc/Writers/HTML.hs
@@ -340,7 +340,7 @@ pandocToHtml opts (Pandoc meta blocks) = do
                   defField "slidy-url"
                     ("https://www.w3.org/Talks/Tools/Slidy2" :: Text) $
                   defField "slideous-url" ("slideous" :: Text) $
-                  defField "revealjs-url" ("reveal.js" :: Text) $
+                  defField "revealjs-url" ("https://unpkg.com/reveal.js@^4/" :: Text) $
                   defField "s5-url" ("s5/default" :: Text) $
                   defField "html5" (stHtml5 st)
                   metadata
-- 
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