diff --git a/src/subParsers/makehtml/encodeAmpsAndAngles.js b/src/subParsers/makehtml/encodeAmpsAndAngles.js
index f62ae0c..ca10eb7 100644
--- a/src/subParsers/makehtml/encodeAmpsAndAngles.js
+++ b/src/subParsers/makehtml/encodeAmpsAndAngles.js
@@ -33,6 +33,9 @@ showdown.subParser('makehtml.encodeAmpsAndAngles', function (text, options, glob
   // Encode >
   text = text.replace(/>/g, '>');
 
+  // encode "
+  text = text.replace(/"/g, '"');
+
   let afterEvent = new showdown.Event('makehtml.encodeAmpsAndAngles.onEnd', text);
   afterEvent
     .setOutput(text)
diff --git a/src/subParsers/makehtml/escapeSpecialCharsWithinTagAttributes.js b/src/subParsers/makehtml/escapeSpecialCharsWithinTagAttributes.js
index e2447c4..769f839 100644
--- a/src/subParsers/makehtml/escapeSpecialCharsWithinTagAttributes.js
+++ b/src/subParsers/makehtml/escapeSpecialCharsWithinTagAttributes.js
@@ -22,7 +22,7 @@ showdown.subParser('makehtml.escapeSpecialCharsWithinTagAttributes', function (t
   text = startEvent.output;
 
   // Build a regex to find HTML tags.
-  let tags     = /<\/?[a-z\d_:-]+(?:[\s]+[\s\S]+?)?>/gi,
+  let tags     = /<\/?[a-z\d_:-]+(?:\s+[\s\S]+?)?>/gi,
       comments = /<!(--(([^>-]|-[^>])([^-]|-[^-])*)--)>/gi;
 
   text = text.replace(tags, function (wholeMatch) {
diff --git a/src/subParsers/makehtml/heading.js b/src/subParsers/makehtml/heading.js
index d22ee42..8e8a3a9 100644
--- a/src/subParsers/makehtml/heading.js
+++ b/src/subParsers/makehtml/heading.js
@@ -309,7 +309,7 @@
 
           if (/^¨K\d+K$/.test(nLastLine) || /^\s*$/gm.test(nLastLine)) {
             // everything before --- or === is a block or empty line, so it's a false positive
-            prepend += nPrepend;
+            prepend += nPrepend + '\n\n';
             headingText = '';
           } else {
             // the last line is something else... so let's look at the line before that
diff --git a/test/functional/makehtml/cases/features/#320.github-compatible-generated-header-id.html b/test/functional/makehtml/cases/features/#320.github-compatible-generated-header-id.html
index cea0af8..f0f4c2a 100644
--- a/test/functional/makehtml/cases/features/#320.github-compatible-generated-header-id.html
+++ b/test/functional/makehtml/cases/features/#320.github-compatible-generated-header-id.html
@@ -1,5 +1,3 @@
 <h1 id="some-header">some header</h1>
-
-<h1 id="some-header-with--chars">some header with &amp;+$,/:;=?@\"#{}|^¨¿？：~[]`゠＝…‥『』〝〟「」\*()｛｝（）［］【】%.。，¡!！' chars</h1>
-
+<h1 id="some-header-with--chars">some header with &amp;+$,/:;=?@&quot;#{}|^¨¿？：~[]`゠＝…‥『』〝〟「」\*()｛｝（）［］【】%.。，¡!！' chars</h1>
 <h1 id="another-header--with--chars">another header &gt; with &lt; chars</h1>
diff --git a/test/functional/makehtml/cases/features/rawHeaderId/with-prefixHeaderId.html b/test/functional/makehtml/cases/features/rawHeaderId/with-prefixHeaderId.html
index 21ed9be..8145cc1 100644
--- a/test/functional/makehtml/cases/features/rawHeaderId/with-prefixHeaderId.html
+++ b/test/functional/makehtml/cases/features/rawHeaderId/with-prefixHeaderId.html
@@ -1,2 +1,2 @@
 <h1 id="/prefix/some-header">some header</h1>
-<h1 id="/prefix/another-!-#$%&/()=?»@£§{[]}«--header">another !"#$%&amp;/()=?»@£§{[]}«' header</h1>
+<h1 id="/prefix/another-!-#$%&/()=?»@£§{[]}«--header">another !&quot;#$%&amp;/()=?»@£§{[]}«' header</h1>