cmark

diff --git a/test/smart_punct.txt b/test/smart_punct.txt
@@ -4,84 +4,84 @@ Open quotes are matched with closed quotes.
 The same method is used for matching openers and closers
 as is used in emphasis parsing:
 
-.
+```````````````````````````````` example
 "Hello," said the spider.
 "'Shelob' is my name."
 .
 <p>“Hello,” said the spider.
 “‘Shelob’ is my name.”</p>
-.
+````````````````````````````````
 
-.
+```````````````````````````````` example
 'A', 'B', and 'C' are letters.
 .
 <p>‘A’, ‘B’, and ‘C’ are letters.</p>
-.
+````````````````````````````````
 
-.
+```````````````````````````````` example
 'Oak,' 'elm,' and 'beech' are names of trees.
 So is 'pine.'
 .
 <p>‘Oak,’ ‘elm,’ and ‘beech’ are names of trees.
 So is ‘pine.’</p>
-.
+````````````````````````````````
 
-.
+```````````````````````````````` example
 'He said, "I want to go."'
 .
 <p>‘He said, “I want to go.”’</p>
-.
+````````````````````````````````
 
 A single quote that isn't an open quote matched
 with a close quote will be treated as an
 apostrophe:
 
-.
+```````````````````````````````` example
 Were you alive in the 70's?
 .
 <p>Were you alive in the 70’s?</p>
-.
+````````````````````````````````
 
-.
+```````````````````````````````` example
 Here is some quoted '`code`' and a "[quoted link](url)".
 .
 <p>Here is some quoted ‘<code>code</code>’ and a “<a href="url">quoted link</a>”.</p>
-.
+````````````````````````````````
 
 Here the first `'` is treated as an apostrophe, not
 an open quote, because the final single quote is matched
 by the single quote before `jolly`:
 
-.
+```````````````````````````````` example
 'tis the season to be 'jolly'
 .
 <p>’tis the season to be ‘jolly’</p>
-.
+````````````````````````````````
 
 Multiple apostrophes should not be marked as open/closing quotes.
 
-.
+```````````````````````````````` example
 'We'll use Jane's boat and John's truck,' Jenna said.
 .
 <p>‘We’ll use Jane’s boat and John’s truck,’ Jenna said.</p>
-.
+````````````````````````````````
 
 An unmatched double quote will be interpreted as a
 left double quote, to facilitate this style:
 
-.
+```````````````````````````````` example
 "A paragraph with no closing quote.
 
 "Second paragraph by same speaker, in fiction."
 .
 <p>“A paragraph with no closing quote.</p>
 <p>“Second paragraph by same speaker, in fiction.”</p>
-.
+````````````````````````````````
 
 Quotes that are escaped come out as literal straight
 quotes:
 
-.
+```````````````````````````````` example
 \"This is not smart.\"
 This isn\'t either.
 5\'8\"
@@ -89,11 +89,11 @@ This isn\'t either.
 <p>&quot;This is not smart.&quot;
 This isn't either.
 5'8&quot;</p>
-.
+````````````````````````````````
 
 Two hyphens form an en-dash, three an em-dash.
 
-.
+```````````````````````````````` example
 Some dashes:  em---em
 en--en
 em --- em
@@ -105,7 +105,7 @@ en–en
 em — em
 en – en
 2–3</p>
-.
+````````````````````````````````
 
 A sequence of more than three hyphens is
 parsed as a sequence of em and/or en dashes,
@@ -118,7 +118,7 @@ dashes, and as few en dashes as possible are
 used (so, 7 hyphens = 2 em dashes an 1 en
 dash).
 
-.
+```````````````````````````````` example
 one-
 two--
 three---
@@ -140,29 +140,29 @@ seven—––
 eight––––
 nine———
 thirteen———––.</p>
-.
+````````````````````````````````
 
 Hyphens can be escaped:
 
-.
+```````````````````````````````` example
 Escaped hyphens: \-- \-\-\-.
 .
 <p>Escaped hyphens: -- ---.</p>
-.
+````````````````````````````````
 
 Three periods form an ellipsis:
 
-.
+```````````````````````````````` example
 Ellipses...and...and....
 .
 <p>Ellipses…and…and….</p>
-.
+````````````````````````````````
 
 Periods can be escaped if ellipsis-formation
 is not wanted:
 
-.
+```````````````````````````````` example
 No ellipses\.\.\.
 .
 <p>No ellipses...</p>
-.
+````````````````````````````````