Declarations do not need a space, per the spec.

See commonmark/cmark#456.
commonmark · Nov 3, 2022 · 9a16ff4 · 9a16ff4
1 parent 46538e5
commit 9a16ff4
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diff --git a/lib/common.js b/lib/common.js
@@ -26,7 +26,7 @@ var OPENTAG = "<" + TAGNAME + ATTRIBUTE + "*" + "\\s*/?>";
 var CLOSETAG = "</" + TAGNAME + "\\s*[>]";
 var HTMLCOMMENT = "<!-->|<!--->|<!--(?:[^-]+|-[^-]|--[^>])*-->"
 var PROCESSINGINSTRUCTION = "[<][?][\\s\\S]*?[?][>]";
-var DECLARATION = "<![A-Z]+" + "\\s+[^>]*>";
+var DECLARATION = "<![A-Z]+" + "[^>]*>";
 var CDATA = "<!\\[CDATA\\[[\\s\\S]*?\\]\\]>";
 var HTMLTAG =
     "(?:" +

diff --git a/test/regression.txt b/test/regression.txt
@@ -245,3 +245,11 @@ abc
 .
 <!docType html>
 ````````````````````````````````
+
+Declarations don't need spaces, according to the spec (cmark#456)
+```````````````````````````````` example
+x <!A>
+.
+<p>x <!A></p>
+````````````````````````````````
+