Use 16:9 aspect and bump reveal.js to 5.1.0
Change-Id: I6384639329daef18a40ca55cbd3c4eab0ae500e1
diff --git a/inst/reveal.js-5.1.0/js/utils/constants.js b/inst/reveal.js-5.1.0/js/utils/constants.js
new file mode 100644
index 0000000..91a9f22
--- /dev/null
+++ b/inst/reveal.js-5.1.0/js/utils/constants.js
@@ -0,0 +1,17 @@
+
+export const SLIDES_SELECTOR = '.slides section';
+export const HORIZONTAL_SLIDES_SELECTOR = '.slides>section';
+export const VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section';
+export const HORIZONTAL_BACKGROUNDS_SELECTOR = '.backgrounds>.slide-background';
+
+// Methods that may not be invoked via the postMessage API
+export const POST_MESSAGE_METHOD_BLACKLIST = /registerPlugin|registerKeyboardShortcut|addKeyBinding|addEventListener|showPreview/;
+
+// Regex for retrieving the fragment style from a class attribute
+export const FRAGMENT_STYLE_REGEX = /fade-(down|up|right|left|out|in-then-out|in-then-semi-out)|semi-fade-out|current-visible|shrink|grow/;
+
+// Slide number formats
+export const SLIDE_NUMBER_FORMAT_HORIZONTAL_DOT_VERTICAL = 'h.v';
+export const SLIDE_NUMBER_FORMAT_HORIZONTAL_SLASH_VERTICAL = 'h/v';
+export const SLIDE_NUMBER_FORMAT_CURRENT = 'c';
+export const SLIDE_NUMBER_FORMAT_CURRENT_SLASH_TOTAL = 'c/t';
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